Visible-light Multimodal and Multidirectional Information Delivery Method using Lenticular Lens
Takahito Matsufuji; Yusuke Kozawa; Hiromasa Habuchi, Last
2025 RISP International Workshop on Nonlinear Circuits, Communications and Signal Processing, Mar. 2025, [Reviewed]
Data Transmission Efficiency Taking Account of Synchronization Property in Modified MPPM System with RGB-LED
Riku Sakai; Yusuke Kozawa; Hiromasa Habuchi, Last
2025 RISP International Workshop on Nonlinear Circuits, Communications and Signal Processing, Mar. 2025, [Reviewed]
Extended VN-CodeSK System Embedding (L,L) Threshold Secret Sharing Scheme
Junya Yada; Yusuke Kozawa; Hiromasa Habuchi, Last
2025 RISP International Workshop on Nonlinear Circuits, Communications and Signal Processing, Mar. 2025, [Reviewed]
Design and Analysis of Enhanced IM/DD System with Nonorthogonal Code Shift Keying and Parallel TransmissionNobuyoshi Komuro; Hiromasa Habuchi, Last, Providing Optical Wireless Communications (OWCs) is desirable for high data transmission efficiency. Intensity Modulation and Direct Detection (IM/DD) is widely adopted for its simplicity and practicality. Among various modulation schemes, Code Shift Keying (CSK) has demonstrated superior transmission efficiency compared to On-Off Keying (OOK) and Pulse Position Modulation (PPM). Prior research has shown that CSK performance can be further enhanced through parallel transmission and code concatenation techniques. However, the direct application of concatenated CSK to parallel transmission reduces the number of available code combinations as the concatenation level increases, potentially lowering modulation efficiency. This study proposes an advanced transmission scheme that integrates parallel transmission with a multi-level intensity adjustment mechanism. The proposed method preserves a high number of distinguishable transmission symbols, thereby achieving higher data transmission rates. Analytical derivations for transmission efficiency are provided for single-user scenarios, and numerical simulations validate the effectiveness of the proposed system. The key contributions of this work include mitigating symbol reduction in nonorthogonal CSK with parallel transmission and adjusting the multi-level intensity to enhance overall system performance. The results confirm that the proposed scheme significantly improves the efficiency and scalability of nonorthogonal CSK in OWC applications., MDPI AG
Photonics, 19 Feb. 2025
Code Tracking System Design of Optical-Wireless Code Shift Keying with Concatenated MPOMs
Norito Baba; Hiromasa Habuchi; Nobuyoshi Komuro, Corresponding
IEEE 13th Global Conference on Consumer Electronics, Oct. 2024, [Reviewed]
One-hop On-demand WSN Based on Multi-carrier CDMA with Orthogonal M-sequences
Shin Hirayama; Yusuke Kozawa; Hiromasa Habuchi, Last
IEEE 13th Global Conference on Consumer Electronics, Oct. 2024, [Reviewed]
Frame Acquisition Scheme for Optical-wireless Modified MPPM
Riku Sakai; Yusuke Kozawa; Hiromasa Habuchi, Last
IEEE 13th Global Conference on Consumer Electronics, Oct. 2024, [Reviewed]
Enhanced Illumination-light VN-CodeSK System with Secret Sharing Scheme
Junya Yada; Yusuke Kozawa; Hiromasa Habuchi, Last
IEEE 13th Global Conference on Consumer Electronics, Oct. 2024, [Reviewed]
Channel Capacity Evaluation of Digital Color Shift Keying with Spatial Modulation Technique
Naoki Ishitsuka; Yusuke Kozawa; Hiromasa Habuchi, Last
Journal of Signal Processing, Jul. 2024, [Reviewed]
Maximizing Transmission Rate of Variable xASK-CodeSK with Illumination Device
Yu Ichitsuka; Yusuke Kozawa; Hiromasa Habuchi, Last, RISP
2024 RISP International Workshop on Nonlinear Circuits, Communications and Signal Processing, 27 Feb. 2024, [Reviewed]
Channel Capacity Evaluation of Digital Color Shift Keying with Spatial Modulation Technique
Naoki Ishitsuka; Yusuke Kozawa; Hiromasa Habuchi, Last, RISP
2024 RISP International Workshop on Nonlinear Circuits, Communications and Signal Processing, 27 Feb. 2024, [Reviewed]
Suitable Color Toning for MIMO LED Illumination-Light Communication System
Tianhe Huang; Yusuke Kozawa; Hiromasa Habuchi, Last, RISP
2024 RISP International Workshop on Nonlinear Circuits, Communications and Signal Processing, 27 Feb. 2024, [Reviewed]
Enhancement of optimized CSK for USLIPT
Honoka Yoshinaga; Yusuke Kozawa; Hiromasa Habuchi, Last, IEEE
IEEE Global Communication Conference, 06 Dec. 2023, [Reviewed]
VN-CodeSK Based Optical Fingerprint System with Non-uniform Grid Interval According to μ-Law
Yuta Ochiai; Daisuke Ogawa; Yusuke Kozawa; Hiromasa Habuchi, Last, IEEE
IEEE 12th Global Conference on Consumer Electronics, 12 Oct. 2023, [Reviewed]
Theoretical Analysis of Variable xASK-CodeSK System for SLIPT
Yu Ichitsuka; Yusuke Kozawa and Hiromasa Habuchi, Last, IEEE
IEEE 12th Global Conference on Consumer Electronics, 10 Oct. 2023, [Reviewed]
MIMO LED Illumination-Light Communication that Fuses Two Kinds of Data Different in Property
Tenwa Koh; Yusuke Kozawa; Hiromasa Habuchi, Last, IEEE
IEEE 12th Global Conference on Consumer Electronics, 10 Oct. 2023, [Reviewed]
Non-uniform Grid-based Optical Fingerprint Positioning on VN-CSK System
Daisuke Ogawa; Yuta Ochiai; Yusuke Kozawa; Hiromasa Habuchi, Last, RISP
2023 RISP International Workshop on Nonlinear Circuits, Communications and Signal Processing, 01 Mar. 2023, [Reviewed]
Comparison of Trilateration Method and Optical Fingerprinting Method Based on Optical Wireless VN-CodeSK System
Yuta Ochiai; Daisuke Ogawa; Yusuke Kozawa; Hiromasa Habuchi, Last, RISP
2023 RISP International Workshop on Nonlinear Circuits, Communications and Signal Processing, 01 Mar. 2023, [Reviewed]
Enhanced xASK-CodeSK for SLIPT
Yu Ichitsuka; Yusuke Kozawa; Hiromasa Habuchi, Last, RISP
2023 RISP International Workshop on Nonlinear Circuits, Communications and Signal Processing, 01 Mar. 2023, [Reviewed]
Influence of Reflected Light in Illumination-Light VN-CodeSK Based Positioning Systems
Yuta Ochiai; Daisuke Ogawa; Yusuke Kozawa; Hiromasa Habuchi, Last, IEEE
International Symposium on Information Theory and Its Applications, 19 Oct. 2022, [Reviewed]
Theoretical Analysis of Packet Success Rate Considering Delay Fluctuation of Arrival Timing of Packets on Three-Mode Based On-Demand WSN
Masanori Suetake; Hiromasa Habuchi, Corresponding, IEEE
IEEE 11th Global Conference on Consumer Electronics, 18 Oct. 2022, [Reviewed]
Design of xASK-CodeSK System for Simultaneous Visible Light Wireless Information and Power Transfer
Yu Ichitsuka; Yusuke Kozawa and Hiromasa Habuchi, Last, IEEE
IEEE 11th Global Conference on Consumer Electronics, 18 Oct. 2022, [Reviewed]
Search-Area Partitioning Approach to Optical,Fingerprint Positioning System
Daisuke Ogawa; Yuta Ochiai; Yusuke Kozawa and Hiromasa Habuchi, Last, IEEE
IEEE 11th Global Conference on Consumer Electronics, 18 Oct. 2022, [Reviewed]
RGB-Based Secret Sharing Illumination-Light Communications With VN-CodeSK
Ryohei Hazu; Yusuke Kozawa and Hiromasa Habuchi, Last, IEEE
IEEE 11th Global Conference on Consumer Electronics, 18 Oct. 2022, [Reviewed]
Simple Optical Fingerprint Method for Indoor Visible-Light Communications
Daisuke Ogawa; Kouki Taruishi; Yusuke Kozawa; Hiromasa Habuchi, Last, RISP
2022 RISP International Workshop on Nonlinear Circuits, Communications and Signal Processing, 28 Feb. 2022, [Reviewed]
Enhancement of VN-CodeSK with VSS System on RGB Illumination-Light Parallel Communication
Ryohei Hazu; Keisuke Manaka; Hiromasa Habuchi; Yusuke Kozawa, Corresponding, RISP
2022 RISP International Workshop on Nonlinear Circuits, Communications and Signal Processing, 28 Feb. 2022, [Reviewed]
Impact of Packet Synchronization Timing Gaps on MC-CDMA based 3-modes On-demand WSN with Packet Combining Scheme
Masanori Suetake; Gen Li; Hiromasa Habuchi; Yusuke Kozawa, Corresponding, RISP
2022 RISP International Workshop on Nonlinear Circuits, Communications and Signal Processing, 28 Feb. 2022, [Reviewed]
Chlorophyll concentration-based CSK constellation point design for underwater SLIPT with priority on communication performance
Takuma Kogo; Yusuke Kozawa; Hiromasa Habuchi, Last
The 24th International Symposium On Wireless Personal Multimedia Communications, 16 Dec. 2021, [Reviewed]
Theoretical analysis of selective variable rate multi-pulse pulse position modulation for visible light communications
Tatsuya Iwase; Yusuke Kozawa; Hiromasa Habuchi, Last
The 24th International Symposium On Wireless Personal Multimedia Communications, 16 Dec. 2021, [Reviewed]
Visual Secret Sharing Based RGB Parallel Transmission System
Ryohei Hazu; Yusuke Kozawa; Hiromasa Habuchi, Last
The 24th International Symposium On Wireless Personal Multimedia Communications, 16 Dec. 2021, [Reviewed]
High Accuracy Positioning System on Indoor Optical Wireless VN-CSK System
Hikari Iizuka; Ran Sun; Hiromasa Habuchi; Yusuke Kozawa, Lead, 電子情報通信学会
Proceedings of the RISP International Workshop on Nonlinear Circuits, Communication and Signal Processing, 29 Oct. 2021, [Invited]
Novel Frame Synchronization System for RGB-LED Parallel Transmission Employing BPPM Format
Jyo Matsushima; Hiromasa Habuchi, Last
20th International Symposium on Communications and Information Technologies, 22 Oct. 2021, [Reviewed]
Code Tracking System for Optical-Wireless Code-Shift-Keying Using Two-Layered PN Code
Ryouta Kuriyama; Hiromasa Habuchi, Corresponding
20th International Symposium on Communications and Information Technologies, 22 Oct. 2021, [Reviewed]
Improved Optical Fingerprint Positioning System for Illumination-Light VN-CSK Communications
Daisuke Ogawa; Kouki Taruishi; Yusuke Kozawa; Hiromasa Habuchi, Corresponding, IEEE
IEEE 10th Global Conference on Consumer Electronics, 12 Oct. 2021, [Reviewed]
Design of Low-Power Mode Based On-Demand WSN with MC-CDMA
Masanori Suetake; Yusuke Kozawa; Hiromasa Habuchi, Corresponding, IEEE
IEEE 10th Global Conference on Consumer Electronics, 12 Oct. 2021, [Reviewed]
Design of VN-CSK System Based Parallel Transmission with RGB-LED
Kouki Taruishi; Yusuke Kozawa; Hiromasa Habuchi, Corresponding, IEEE
IEEE 10th Global Conference on Consumer Electronics, 12 Oct. 2021, [Reviewed]
Chlorophyll concentration-based CSK constellation point optimization for underwater SLIPT using time splitting receiver
Takuma Kogo; Yusuke Kozawa; Hiromasa Habuchi, Last
IEEE Global Communications Conference, Workshop on Optical Wireless Communication, 07 Dec. 2020, [Reviewed]
Parallel Optical Wireless Communication System with Hierarchical Nonorthogonal Code Shift Keying
Nobuyoshi Komuro; Hiromasa Habuchi, Last
4th International Conference on Telecommunications and Communication Engineering, 06 Dec. 2020, [Reviewed]
A Two-stage Coding Scheme by Using Two Kinds of PN Codes for RGB Parallel Optical Wireless Communication
Kouki Taruishi; Yusuke Kozawa; Hiromasa Habuchi, Corresponding
2020 International Conference on Emerging Technologies for Communications, 04 Dec. 2020, [Reviewed]
Evaluation of Optical-Wireless Turbo Coded System Having Simple Self-Synchronization Method
Tomohiro Kiguchi; Yusuke Kozawa; Hiromasa Habuchi, Corresponding
2020 International Conference on Emerging Technologies for Communications, 04 Dec. 2020, [Reviewed]
問合せデータの分散表現を用いた分類山本一幸; 大瀧保広; 佐藤伸也; 嶌田敏行; 野口宏; 羽渕裕真; 外岡秀行, Last
学術情報処理研究, 01 Dec. 2020,
[Reviewed] 〔Major achievements〕Theoretical Analysis of Illumination-Light VN-CSK Based Equal-Weight (2, 2) VSS with MPOMS Balancer
Keisuke Manaka; Liyuan Chen; Hiromasa Habuchi; Yusuke Kozawa, Corresponding, IEEE 9th Global Conference on Consumer Electronics
16 Oct. 2020, [Reviewed]
Frame Synchronization Performance of Optical-Wireless Hybrid BPPM-OOK System
Tomohiro Kiguchi; Hiromasa Habuchi; Ran Sun; Yusuke Kozawa, Corresponding, ITNAC
International Telecommunication Networks and Applications Conference, 27 Nov. 2019, [Reviewed]
Theoretical Analysis of Equal-Weight (2,2) VSS on VN-CSK Illumination Light Communication
Keisuke Manaka; Liyuan Chen; Hiromasa Habuchi; Yusuke Kozawa, Corresponding, ITNAC
International Telecommunication Networks and Applications Conference, 27 Nov. 2019, [Reviewed]
Intensity Modulation Direct Detection Optical Wireless Communication with Nonorthogonal Code Shift Keying
Nobuyoshi Komuro; Hiromasa Habuchi, Last, IEEE
IEEE 8th Global Conference on Consumer Electronics, 17 Oct. 2019, [Reviewed]
Implementation of a Scalable Interactive Visualization Environment to Support Information Sharing and Decision-Making in Mega Disasters
Ryo Nakai; Tomoyuki Ishida; Hiromasa Habuchi, Last, ReBICTE
Research Briefs on Information & Communication Technology Evoluti, 01 Oct. 2019, [Reviewed]
Proposal of a High-Presence Japanese Traditional Crafts Presentation System integrated with Different Cultures
Yangzhicheng Lu; Tomoyuki Ishida; Akihiro Miyakawa; Yoshitaka Shibata; Hiromasa Habuchi
The 22nd Springer International Conference on Network-Based Information Systems, Sep. 2019, [Reviewed]
Proposal of Interactive Information Sharing System using Large Display for Disaster Management
Ryo Nakai; Tomoyuki Ishida; Noriki Uchida; Yoshitaka Shibata; Hiromasa Habuchi
The 22nd Springer International Conference on Network-Based Information Systems, Sep. 2019, [Reviewed]
Proposal of Equal-Weight (2,2) Visual Secret Sharing Schemes on VN-CSK Illumination Light Communication
Keisuke Manaka; Liyuan Chen; Hiromasa Habuchi; Yusuke Kozawa, Corresponding, IEEE
IEEE Asia-Pacific Wireless Communications Symposium, 29 Aug. 2019, [Reviewed]
Proposal of Frame Synchronization Method for Optical Turbo Coded System with Hybrid PPM-OOK Signaling
Tomohiro Kiguchi; Ran Sun; Hiromasa Habuchi; Yusuke Kozawa, Corresponding, IEEE
IEEE Asia-Pacific Wireless Communications Symposium, 29 Aug. 2019, [Reviewed]
Underwater Visible Light Simultaneous Wireless Information and Power Transfer using Inverse Pulse Position Modulation Scheme
Ryota Kimoto; Yusuke Kozawa; Yohtaro Umeda; Hiromasa Habuchi, Last
Proceedings of the RISP International Workshop on Nonlinear Circuits, Communication and Signal Processing, 05 Mar. 2019, [Reviewed]
Effective Frame Error Detecting Scheme for Optical-Wireless Advanced Framed-DOOK System
Yuta Asano; Hiromasa Habuchi; Yusuke Kozawa, Corresponding
Proceedings of the RISP International Workshop on Nonlinear Circuits, Communication and Signal Processing, 05 Mar. 2019, [Reviewed]
Proposal of a Furniture Layout Simulation System using Mixed Reality Technology
Lu Yangzhicheng; Tomoyuki Ishida; Hiromasa Habuchi, Last
Proceedings of the 24th International Symposium on Artificial Life and Robotics, 24 Jan. 2019, [Reviewed]
Proposal of a Scalable Interactive Visualization Environment using Large Display in Emergency
Ryo Nakai; Tatsuya Ohyanagi; Tomoyuki Ishida; Hiromasa Habuchi, Last
Proceedings of the 24th International Symposium on Artificial Life and Robotics, 24 Jan. 2019, [Reviewed]
Frame Error Detection Performance of Optical-Wireless Advanced Framed-DOOK System
Yuto Asano; Hiromasa Habuchi; and Yusuke Kozawa
Proceedings of International Conference on Signal Processing and Communication Systems, 17 Dec. 2018, [Reviewed]
Theoretical Analysis on Bit Error Rate of Visible-Light Variable N-parallel Code-Shift-Keying
Keisuke Osawa; Hiromasa Habuchi; and Yusuke Kozawa, IEICE
IEICE Transaction on Fundamentals, 01 Dec. 2018, [Reviewed]
Enhanced On-demand WSN in terms of MC-CDMA with MPOMS
Yutaka Imaizumi; Hiromasa Habuchi; and Yusuke Kozawa, IEEE
Proceedings of IEEE International Symposium on Intelligent Signal Processing and Communication Systems, 28 Nov. 2018, [Reviewed]
Exact Bit Error Rate Analysis for Optical-Wireless Framed-DOOK System
Yuto Asano; Hiromasa Habuchi; and Yusuke Kozawa
Proceedings of IEEE 7th Global Conference of Consumer Electronics, 12 Oct. 2018, [Reviewed]
BER Performance Impaired by Transmission Time Offset Between Users in Optical Wireless CSK/ACDMA System Using DMPOMs
Takashi Tokunaga; Hiromasa Habuchi; Yusuke Kozawa; and Ran Sun
Proceedings of IEEE 7th Global Conference of Consumer Electronics, 12 Oct. 2018, [Reviewed]
Improved Packet Success Rate on MC-CDMA based On-demand WSN System with MPOMS
Yutaka Imaizumi; Hiromasa Habuchi; and Koichiro Hashiura
Proceedings of IEEE Vehicular Technology Society Asia Pacific Wireless Communications Symposium, 22 Aug. 2018, [Reviewed]
Proposal of VN-CSK System having Positioning Function
Hikari Iiduka; Hiromasa Habuchi; and Yusuke Kozawa
Proceedings of IEEE Vehicular Technology Society Asia Pacific Wireless Communications Symposium, 22 Aug. 2018, [Reviewed]
Theoretical Analysis of Optical-Wireless Code Shift Keying System using Extended Einarsson Code
Tomofumi Haruna; Hiromasa Habuchi; and Yusuke Kozawa
Proceedings of IEEE Vehicular Technology Society Asia Pacific Wireless Communications Symposium, 22 Aug. 2018, [Reviewed]
Proposal of a Disaster Support Expert System Using Accumulated Empirical Data
atsuya Ohyanagi; Tomoyuki Ishida; Noriki Uchida; Yoshitaka Shibata; and Hiromasa Habuchi
Proceedings of The 12th International Conference on Innovative Mobile and Internet Services in Ubiquitous Computing, 04 Jul. 2018, [Reviewed]
Design of Synchronization Signal Embedded Optical Wireless Differential OOK
Yuta Asano; Hiromasa Habuchi; Yusuke Kozawa
Proceedings of 2nd International Conference and Exhibition on Visible Light Communications, 16 Mar. 2018, [Reviewed]
Performance Evaluation of Hybrid VN-CSK/PAM for Lighting Constrained Visible Light Communications
Keisuke Osawa; Hiromasa Habuchi; Yusuke Kozawa
Proceedings of the RISP International Workshop on Nonlinear Circuits, Communication and Signal Processing, 06 Mar. 2018, [Reviewed]
Error Correcting Codes in Underwater RGB-LED Parallel Communication: Turbo or LDPC?
San Sun; Hiromasa Habuchi; Yusuke Kozawa
Proceedings of the RISP International Workshop on Nonlinear Circuits, Communication and Signal Processing, 06 Mar. 2018, [Reviewed]
Hybrid PWM/DPAM Dimming Control for Digital Color Shift Keying Using RGB-LED ArrayJumpei Okumura; Yusuke Kozawa; Yohtaro Umeda; and Hiromasa Habuchi, As a method of dimming support for visible light communications using a massive LED array, we consider a hybrid pulse width modulation/digitally controlled pulse amplitude modulation (PWM/DPAM) system. Especially, in this paper, we consider a digital color shift keying (DCSK) using an RGB-LED array as an optical intensity modulation scheme, that transmits data through the ratio of the optical intensities (i.e., color) emitted by red, green, and blue LEDs. In DCSK, since only one color is activated in each RGB-LED at a time, the color can be represented by the combination of the digitally (i.e., linearly) controlled 'ON-OFF' LEDs. In general, for the dimming control system of DCSK, two schemes have been considered. One is the dimming control by PWM, which changes the duty cycle of optical transmit signals, and the other is the dimming control by DPAM, which changes the number of active LEDs in the RGB-LED array. In this paper, PWM and DPAM are combined to realize a higher spectral efficiency than PWM and a wider dimming range than DPAM. We evaluate the error performances of the proposed system, DCSK with PWM, and DCSK with DPAM from a simulation analysis under several measured light dimming levels. The results show that DPAM should be used only for low bit rate systems because the effect of inter-symbol-interference (ISI), caused by the LED frequency response, increases at a high bit rate. While, PWM is significantly robust against ISI because the PWM signal duration is limited in a symbol duration at the low dimming levels and the empty duration can mitigate the effect of ISI even if the bit rate is high. When focusing on symbol error rate performances corresponding to the dimming levels, the hybrid dimming control and the PWM dimming control can achieve lower signal energy-to-noise-ratio at the dimming level of low and high, respectively., Institute of Electrical and Electronics Engineers Inc.
IEEE Journal on Selected Areas in Communications, Jan. 2018,
[Reviewed] Improved synchronization scheme for indoor visible-light differential on-off keyingYuta Asano; Hiromasa Habuchi; Yusuke Kozawa, In this paper, as binary modulation schemes, the differential on-off keying (DOOK) system, which can achieve anti-background noise capability and high data transmission efficiency, is considered. In order to solve the synchronization slip, a visible-light framed DOOK system embedding {-1,+1}-synchronization signal pattern is proposed. Moreover, theoretical formulas of detection and false alarm probability are derived. The detection probability taking into account false rate is evaluated under the visible-light channel with scintillation and background noise. Consequently, in the evaluation of detection probability taking into account false alarm rate, the proposed system is better than the conventional system., Institute of Electrical and Electronics Engineers Inc.
2017 IEEE 6th Global Conference on Consumer Electronics, GCCE 2017, 19 Dec. 2017,
[Reviewed] SCDMA Capability of High-Density Code-Shift Keying using Dual MPOMs in Optical-Wireless Channel
Takashi Tokunaga; Hiromasa Habuchi; Yusuke Kozawa and Ran Sun
Proceedings of 27th International Telecommunication Networks and Applications Conference, 24 Nov. 2017, [Reviewed]
Proposal of Optical Wireless Turbo Coded APPM System
Ran Sun; Hiromasa Habuchi and Yusuke Kozawa
Proceedings of 27th International Telecommunication Networks and Applications Conference, 24 Nov. 2017, [Reviewed]
Inverse Pulse Position Modulation Schemes for Simultaneous Visible Light Wireless Information and Power Transfer
Ryota Kimoto; Yusuke Kozawa; Yohtaro Umeda; and Hiromasa Habuchi
Proceedings of 27th International Telecommunication Networks and Applications Conference, 22 Nov. 2017, [Reviewed]
Rigorous Communication Success Probability of MC-CDMA with MPOMS Codes for Radio-On-Demand WSN
Tomohiro Okawa and Hiromasa Habuchi
Proceedings of IEEE 6th Global Conference of Consumer Electronics, 26 Oct. 2017, [Reviewed]
On Suitable Pseudo-Noise Code for Optical-Wireless Hierarchical CSK-MPPM System
Masayuki Ishikawa and Hiromasa Habuchi
Proceedings of IEEE 6th Global Conference of Consumer Electronics, 25 Oct. 2017, [Reviewed]
Yuto Asano, Hiromasa Habuchi, and Yusuke Kozawa
Improved Synchronization Scheme for Indoor Visible-Light Differential On-Off Keying
Proceedings of IEEE 6th Global Conference of Consumer Electronics, 25 Oct. 2017, [Reviewed]
New Two-Layered Pseudo-Noise Code for Optical-Wireless Code-Shift Keying/SCDMA
Takashi Tokunaga; Hiromasa Habuchi; and Yusuke Kozawa
Proceedings of The Eighth International Workshop on Signal Design and Its Applications in Communications, 27 Sep. 2017, [Reviewed]
Impact of Framed-DOOK Optical Wireless System using Error Correcting Codes
Ran Sun; Hiromasa Habuchi; and Yusuke Kozawa
Proceedings of The Eighth International Workshop on Signal Design and Its Applications in Communications, 26 Sep. 2017, [Reviewed]
A Theoretical Analysis of Visible-Light Variable N-parallel Code-Shift-Keying in LOS Indoor Environments
Keisuke Osawa; Hiromasa Habuchi; and Yusuke Kozawa
Proceedings of The Eighth International Workshop on Signal Design and Its Applications in Communications, 25 Sep. 2017, [Reviewed]
Performance Evaluation of Novel Optical-Wireless Variable N-parallel Code-Shift-KeyingKeisuke Osawa; Hiromasa Habuchi and Yusuke Kozawa, The indoor visible light communications have mainly the two serious problems; the bit error rate (BER) deterioration due to interference from ambient light and change of the data transmission efficiency according to dimming level. To settle the above problems, in this paper, the variable N-parallel code-shift-keying (VN-CSK) system with modified prime sequence codes (MPSC) for indoor visible light communications is considered. The VN-CSK system with MPSC achieves the same transmission efficiency by changing the number of the codes to select from M MPSCs depending on light regulation data. For example, if the number of MPSC is 5, the VN-CSK system with MPSC can realize 4 stages of dimming level. Moreover, the VNCSK system with MPSC can suppress the influence of co-channel interference by using the group characteristics of MPSC. The bit error rate performance of the VN-CSK system with MPSC is evaluated in optical wireless channel by theoretical analysis. The VN-CSK system with MPSC can realize BER 10-6 when average received optical power per code is -49 [dBm] and the desired signal to interference signal ratio P-w/P-i = 3 [dB]., IEEE
Proceeding of the 10th International Conference on Signal Processing and Communication Systems, 20 Dec. 2016
Theoretical Analysis of Visible-Light Code-Shift Keying Using Extended Pseudo-Orthogonal M-sequence in Line-of-Sight LinkShota Takayanagi; Hiromasa Habuchi and Yusuke Kozawa, In this paper, visible-light code-shift keying (CSK) systems using the extended pseudo-orthogonal M-sequence (EPOM) are analyzed in line-of-sight (LOS) link. In particular, the bit error rate (BER) characteristics and the influence of interference from ambient light-emitting diodes (LEDs) are clarified by theoretical analysis. In consideration of N/L which is the ratio between the number of codes.. and code lengthN/L of EPOM is L/4 times as large as that of the conventional optical pseudonoise (PN) codes such as the pseudo-orthogonal extended prime sequence code set (POEPC). Therefore, the CSK systems using EPOM have higher information transmission efficiency than the CSK systems using the conventional optical PN codes. In this paper, the BERs of visible-light CSK using EPOM and visible-light CSK using POEPC are evaluated under the same information transmission efficiency in LOS link. As a result, the BERs of the CSK systems using EPOM is lower than that of the CSK systems using POEPC even though there is the influence of the ambient light., IEEE
Proceeding of the 10th International Conference on Signal Processing and Communication Systems, 19 Dec. 2016,
[Reviewed] BER performance of Digital Color Shift Keying with Target Color ControlShunsuke Igata; Yusuke Kozawa; Yohtaro Umeda and Hiromasa Habuchi, In this paper, target color control for digital color shift keying (DCSK) with multiple multicolor LEDs is presented for improving illumination performances of the modulated DCSK signal. This DCSK system using multiple multicolor LEDs can represent the conventional multi-level CSK symbol with the total amount of each non-varying "On-Off" intensity of multiple LEDs. This paper analyzes the illumination and communication performances of DCSK signals, including correlated color temperature (CCT), color tolerance, color rendering index (CRI), and bit error rate (BER). In particular, the BER performances of the DCSK constellations points, which achieve CCT = 3000 K, 5000 K, and 6500 K, are evaluated from theoretical analysis under the conditions of total optical power or total luminous flux is constant for flicker mitigation. Consequently, the CRI performances can be increased when the number of Quad LEDs (QLEDs) increases. Moreover, it can be seen that the BER performance of DCSK with desired CCT of 5000 K is better than those of 3000 K and 6500 K., IEEE
Proceeding of the 10th International Conference on Signal Processing and Communication Systems, 19 Dec. 2016,
[Reviewed] Influence of Synchronization Jitter on BER in Optical-Wireless CSK-MPPM SystemMasayuki Ishikawa and Hiromasa Habuchi, The local broadcasting systems, that transmit synchronization data and message-data simultaneously, have been proposed. These systems use hierarchical modulations to transmit several types of data simultaneously. In this paper, a new hierarchical CSK-MPPM system, which unites code shift keying and multi-pulse pulse position modulation, is proposed. The proposed system demodulates both of data by comparative decision. It means the proposed system does not use threshold decision. Although setting threshold is diff cult, many conventional hierarchical systems use threshold. In the proposed system, the MPPM demodulator use integrator output. Even if a synchronization error occurs, integrator output does not change much. It is known from previous studies that the bit error rate performance of the proposed system is better than that of the MPPM-CNK system, which is a conventional hierarchical modulation system. In this paper, bit error rates of the proposed system and the conventional MPPM-CNK system when the synchronization error occurs, is evaluated. It is shown that the bit error rate of the modulation #2 in proposed system is much better than the that of the modulation #2 in the conventional system., IEEE
Proceeding of Premier International Technical Conference of IEEE Region 10, 25 Nov. 2016,
[Reviewed] Turbo-code Optical Communication System Compatible with Partial Erasure Channel
Ran Sun; Hiromasa Habuchi and Yusuke Kozawa
Proceeding of Premier International Technical Conference of IEEE Region 10, 24 Nov. 2016, [Reviewed]
"Design of an On-Demand Wireless Network Using Multi-Carrier CDMA with Modified Pseudo Orthogonal M-Sequence SetsTomohiro Okawa and Hiromasa Habuchi, A long lifetime of sensor nodes is one of the key points to construct a sensor network. An on-demand wireless network is one of the wasteful power consumption reduction methods. Each sensor node has a single function. By performing wake-up according to function, the power consumption is further reduced. In this paper, an on-demand wireless network using multi-carrier code-division multiple-access (CDMA) with modifed pseudo orthogonal M-sequence sets (MPOMS) is proposed. The detection probability of wake-up signal, the false-alarm probability of wake-up signal, and bit error rate (HER) of data signal is derived. The communication success probability is evaluated., IEEE
Proceeding of Premier International Technical Conference of IEEE Region 10, 24 Nov. 2016,
[Reviewed] Enhancement of RGB Parallel Turbo-code System with UTPA in Optical Partial Erasure Channel
Ran Sun; Hiromasa Habuchi and Yusuke Kozawa
Proceeding of 13th 2016 IEEE Vehicular Technology Society Asia Pacific Wireless Communications Symposium (APWCS2016), 26 Aug. 2016, [Reviewed]
Novel Parallel Optical Turbo-code Communication System using RGB LEDs for Partial Erasure Channel
Ran Sun; Hiromasa Habuchi and Yusuke Kozawa
The 31st International Technical Conference on Circuits/Systems, Computers and Communications (ITC-CSCC 2016), 13 Jul. 2016, [Reviewed]
Proposal of a Variable N-CSK with MPSC for an Intellectual Illumination Light Data Transmission System
Keisuke Osawa; Hiromasa Habuchi and Yusuke Kozawa
The 31st International Technical Conference on Circuits/Systems, Computers and Communications (ITC-CSCC 2016), 13 Jul. 2016, [Reviewed]
New Optical-Wireless CSK-MPPM System with Modified Prime Sequence Code
Masayuki Ishikawa; Hiromasa Habuchi and Atsuhiro Takahashi
The 31st International Technical Conference on Circuits/Systems, Computers and Communications (ITC-CSCC 2016), 13 Jul. 2016, [Reviewed]
Orthogonal Frequency and Code Division Multiplexing Using Modified Pseudo-Ternary M-Sequences Pair
Yuki Hosokawa; Hiromasa Habuchi
The 31st International Technical Conference on Circuits/Systems, Computers and Communications (ITC-CSCC 2016), 11 Jul. 2016, [Reviewed]
Robust Turbo-Coded OOK System for Background Noise Alleviation and Frame Synchronization in Optical Wireless ChannelYuto Matsuda; Hiromasa Habuchi and Yusuke Kozawa, In this paper, optical wireless turbo-coded on-off-keying (OOK) systems have been investigated. These systems suffer from performance deterioration due to background noise and the occurrence of synchronization slip. To solve these problems, an optical wireless system that combines a framed differential OOK (framed-DOOK) system and a punctured turbo-coded system is proposed. The bit error rate (BER) performance ef the punctured turbo-coded framed-DOOK system is evaluated in an optical wireless channel. It is shown that the punctured turbo-coded framed-DOOK system can greatly improve the BER performance of the conventional punctured turbo-coded OOK system. Moreover, in the framed-DOOK systems, the BER of the punctured turbo-coded system is almost the same as that of the standard turbo-coded system. Therefore, the proposed punctured turbo-coded framed-DOOK system is more attractive than the conventional turbo-coded OOK systems for optical wireless communications., Research Institute of Signal Processing, Japan
Journal of Signal Processing, Jul. 2016,
[Reviewed] Improved Code-Shift Keying Systems with Functional Pseudonoise Code in Optical-Wireless ChannelShota Takayanagi; Hiromasa Habuchi; Yusuke Takamaru and Yusuke Kozawa, In this paper, improved code-shift keying (CSK) systems with a functional pseudonoise (PN) code are considered for use in indoor optical-wireless channels. In CSK, increasing the number of optical PN codes improves the data rate. It is also effective for increasing the number of simultaneously transmitting optical PN codes. This method is named N-parallel CSK (N-CSK), which indicates the transmission of N codes. In order to enhance the data rate of CSK systems, optical PN code design has become one of the key areas of study. As such functional codes, in this paper we consider EPOM and POEPC, which can be generated by fusing two kinds of optical PN codes. CSK systems can implement two-stage demodulation, which demodulates every optical PN code. It is expected that two-stage demodulation will improve the bit error rate (BER) performance of CSK systems. In this paper, we combine two-stage demodulation with CSK systems: CSK using EPOM and N-CSK using POEPC. It was found that the BER of CSK systems can be improved by utilizing two-stage demodulation., Research Institute of Signal Processing, Japan
Journal of Signal Processing, Jul. 2016,
[Reviewed] Differential-OOK System for Underwater Visible-Light CommunicationsMitsuru Saotome; Yusuke Kozawa; Yohtaro Umeda and Hiromasa Habuchi, Underwater wireless optical communication (UWOC) can provide higher-data-rate communication over moderate distances for new underwater applications. However, high-speed data transmission in UWOC is mainly limited by spectral attenuation in water and background noise. In this study, we propose an analytical underwater daylight noise model that incorporates the daylight simulation model SPCTRAL2 with an upwelling solar radiance model for the practical analysis of background light for UWOC. Moreover, we also consider a differential on-off-keying (DOOK) system in our simulation model. This DOOK system was proposed to reduce the effect of background noise in free-space optical communications. It was found that the effectiveness of the DOOK system can be verified by our new underwater daylight noise model. For example, for coastal water and harbor water, the DOOK system can improve BERs compared with an OOK system with a fixed threshold. In addition, the DOOK system can achieve a BER of less than10
−6 in coastal water during daylight hours., Research Institute of Signal Processing, Japan
Journal of Signal Processing, Jul. 2016,
[Reviewed] Impact of improved on-off-keyed turbo-code system in optical wireless channel
Yuto Matsuda; Hiromasa Habuchi and Yusuke Kozawa, NCSP
Proceeding of 2016 RISP International Workshop on Nonlinear Circuits, Communications and Signal Processing (NCSP'16), 08 Mar. 2016, [Reviewed]
Differencial-OOK system for underwater visiblelight communications
Mitsuru Saotome; Yusuke Kozawa; Yohtaro Umeda and Hiromasa Habuchi, NCSP
Proceeding of 2016 RISP International Workshop on Nonlinear Circuits, Communications and Signal Processing (NCSP'16), 08 Mar. 2016, [Reviewed]
Data-rate-enhanced optical-wireless code-shift-keying system having two-stage demodulation
Shota Takayanagi; Hiromasa Habuchi; Yusuke Takamaru and Yusuke Kozawa, NCSP
Proceeding of 2016 RISP International Workshop on Nonlinear Circuits, Communications and Signal Processing (NCSP'16), 07 Mar. 2016, [Reviewed]
Rigorous symbol error rate analysis of hierarchical MPPM-CNK through optical wireless channel
Atsuhiro Takahashi; Hiromasa Habuchi and Yusuke Kozawa, NCSP
Proceeding of 2016 RISP International Workshop on Nonlinear Circuits, Communications and Signal Processing (NCSP'16), 07 Mar. 2016, [Reviewed]
Underwater Turbo-code Optical Communication System Compatible with Partial Erasure ChannelRan Sun; Hiromasa Habuchi; Yusuke Kozawa, In this paper, a novel underwater Turbo-code optical communication system compatible with partial erasure channel is proposed. A scheme re-arranging the parity bits of Turbo code is used for preventing the degradation of communication performance in partial erasure channel. Unequal Transmission Power Allocation (UTPA), a technique which allocate different powers to information bits and parity bits keeping the total transmission power fixed, is applied for enhancement of the proposed system. Binary Pulse Position Modulation (BPPM) is used as the modulation technique. The bit error rate (HER) performances of the proposed system are evaluated through computer simulation both in general underwater channel and the special situation: partial erasure channel., IEEE
PROCEEDINGS OF THE 2016 IEEE REGION 10 CONFERENCE (TENCON), 2016,
[Reviewed] Performance evaluation of CDMA-based relay network using binary countdown schemeTakuya Eto; Hiromasa Habuchi; Koichiro Hashiura, In this paper, the spread-spectrum binary countdown scheme with generalized modified prime sequence codes (GMPSC) is considered as the MAC protocol in the multihop network. We focus on the code division multiple access (CDMA) based relay network using binary countdown scheme with GMPSC. The packet success rate and the throughput of binary countdown scheme with GMPSC are evaluated by taking into account the influence of the free space propagation loss and the channel noise. Furthermore, binary countdown scheme with GMPSC is compared with the spread ALOHA scheme. Fairness in communication with a relay node between nodes is investigated. As a result, it is found that binary countdown scheme with GMPSC outperforms the spread ALOHA scheme using orthogonal codes. Moreover, binary countdown scheme with GMPSC can maintain fairness of the binary countdown success rate among nodes. The simulation result are in good agreement with theoretical calculations., IEEE
Proceeding of 10th International Conference on Information, Communications and Signal Processing (ICICS2015), Dec. 2015
Mitigation of the influence of optical background noise by using Turbo-Coded DOOK
Sachin Rai; Yusuke Kozawa; Hiromasa Habuchi; Yuto Matsuda
Journal of Signal Processing, Nov. 2015, [Reviewed]
Optical-wireless enhanced code-shift-keying with IM/DDShota Takayanagi; Hiromasa Habuchi; Yusuke Kozawa, In this paper, the extended pseudo orthogonal Msequence is proposed for the optical-wireless code-shift-keying (CSK) system. The extended pseudo orthogonal M-sequence is a new optical pseudo-noise (PN) code which consists of the modified pseudo orthogonal M-sequence sets (MPOMS) and the bi-orthogonal code. The performance of the CSK systems is enhanced by increasing the number of the optical PN codes. As the conventional optical PN code, the bi-orthogonal code and the pseudo-orthogonal extended prime code set can generate the number of the optical PN codes same as the code length. The extended pseudo orthogonal M-sequence can achieve the performance enhancement of the CSK systems because of its generation of the large number of the codes per the code length. The CSK system using the extended pseudo orthogonal Msequence has better performance than the CSK systems using the conventional PN code., IEEE
Proceeding of 21st Asia- Pacific Conference on Communications (APCC2015), Oct. 2015,
[Reviewed] Indoor optical-wireless code-shift-keying with two-stages demodulationShota Takayanagi; Hiromasa Habuchi; Yusuke Kozawa, In this paper, the code-shift-keying (CSK) system using the extended pseudo orthogonal M-sequence (EPOM) is considered in indoor optical-wireless channel. EPOM is one of optical pseudo-noise (PN) codes designed by the fusion of two PN codes. One is the modified pseudo orthogonal M-sequence sets (MPOMS), the other is the bi-orthogonal code. The CSK systems using the combined PN code demodulate with two stages. As the conventional optical PN code with two-stages demodulation, the pseudo-orthogonal extended prime code set (POEPC) has been proposed. This paper focuses on the comparison between the CSK system using EPOM and the CSK system using POEPC under the same information transmission efficiency. Consequently, the CSK system using EPOM is superior to the CSK system using POEPC., IEEE
Proceeding of IEEE 4th Global Conference on Consumer Electronics (GCCE2015), Oct. 2015,
[Reviewed] Proposal of Turbo-Coded Differential OOK for Optical IM/DD System
Sachin Rai; Yusuke Kozawa; Hiromasa Habuchi; Yuto Matsuda
Proceeding of 2015 RISP International Workshop on Nonlinear Circuits, Communications and Signal Processing (NCSP2015), Mar. 2015, [Reviewed]
Spread Spectrum/Binary Countdown Scheme with GMPSC for Multi-Hop Wireless NetworkTakuya Eto; Hiromasa Habuchi; Koichiro Hashiura, The binary countdown scheme has been investigated as the MAC protocol in the multi-hop network. However, since the conventional binary countdown scheme has the hidden terminal problem, the packet success rate and the throughput are low.
In this paper, in order to solve these problems, a novel binary countdown scheme which combines the relaying system with the spread spectrum communication system is proposed. Generalized Modified Prime Sequence Code(GMPSC) is used as pseudo noise(PN) code. The packet success rate and the throughput of the packet transmission is evaluated by the theoretical analysis. Moreover, the proposed scheme is compared with the conventional binary countdown scheme. As a result, it is found that the proposed scheme achieves higher packet success rate than the conventional binary countdown scheme. Moreover, the performance degradation from the ideal packet success rate which is a case when there is no hidden terminal problem becomes small., SPRINGER-VERLAG BERLIN
Proceeding of Eighth International Conference on Mobile Computing and Ubiquitous Networking (ICMU2015), Jan. 2015,
[Reviewed] Theoretical Analysis of New PN Code on Optical Wireless Code-Shift-KeyingYusuke Takamaru; Sachin Rai; Hiromasa Habuchi, A code shift keying (CSK) using pseudo-noise (PN) codes for optical wireless communications with intensity/modulation and direct detection (IM/DD) is considered. Since CSK has several PN codes, the data transmission rate and the bit error rate (BER) performance can be improved by increasing the number of PN codes. However, the conventional optical PN codes are not suitable for optical CSK with IM/DD because the ratio of the number of PN codes and the code length of PN code, M/L is smaller than 1/root L this paper, an optical CSK with a new PN code, which combines the generalized modified prime sequence code (GMPSC) and Hadamard code is analyzed. The new PN code can achieve M/L = 1. Moreover, the BER performance and the data transmission rate of the CSK system with the new PN code are evaluated through theoretical analysis by taking the scintillation, background-noise, avalanche photodiode (APD) noise, thermal noise, and signal dependent noise into account. It is found that the CSK system with the new PN code outperforms the conventional optical CSK system., IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG
IEICE Transaction on Fundamentals, Dec. 2014,
[Reviewed] Optical Wireless LDGM-BPPM With Unequal Transmission Power Allocation SchemeKyohei Sumikawa; Hiromasa Habuchi, In this paper, the low density generator matrix (LDGM) coded scheme with unequal transmission power allocation (UTPA) in optical wireless channel is evaluated by computer simulation. In particular, the bit error rate performance of the LDGM-coded binary pulse position modulation (LDGM-BPPM) with the UTPA scheme is investigated in the presence of avalanche photo diode (APD) noise, scintillation and background noise. Consequently, the BER performance of the LDGM-BPPM with UTPA is better than that of the conventional LDGM-BPPM. It is found that there is the optimum power ratio (R). The optimum R varies with scintillation and background noise. For example, when the average received laser power is -47 [dBm], the variance of scintillation is 0.1, and background noise is -45 [dBm], the optimum R is 3.1. Thus, the LDGM-BPPM with the UTPA scheme is superior to the conventional LDGM-BPPM system., IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG
IEICE Transaction on Fundamentals, Dec. 2014,
[Reviewed] Enhancement of Punctured Turbo Code with UTPA in Optical Wireless ChannelSachin Rai; Hiromasa Habuchi, In this paper, the performance of rate r=1/2 punctured turbo code using a technique called Unequal Transmission Power Allocation (UTPA) is studied in optical wireless communication (OWC) with intensity modulation and direct detection (IM/DD). UTPA scheme is applied at the outputs of rate r=1/2 punctured turbo encoder. Different powers are allocated to systematic bit and parity bits keeping the total transmission power fixed. BPPM is used as modulation technique and the system's performance is evaluated through simulation in an optical wireless channel. Obtained results suggest that punctured turbo code combined with UTPA technique is an effective method which leads to better Bit Error Rate (BER) performance in an optical wireless channel. Furthermore, suitable power allocation ratio is located for the given channel condition., IEEE
Proceeding of International Symposium on Information Theory and Its Applications (ISITA2014), Oct. 2014,
[Reviewed] Influence of Scintillation and Background Noise on LDGM-BPPM with Unequal Transmission Power Allocation Scheme in Optical Wireless Channel
Kyohei Sumikawa; Hiromasa Habuchi
Journal of Signal Processing, 01 Jul. 2014, [Reviewed]
Influence of Scintillation and Back-ground Noise on the Optical LDGM-BPPM with Unequal Transmission Power Allocation Scheme
Kyohei Sumikawa; Hiromasa Habuchi
Proceeding of 2014 RISP International Workshop on Nonlinear Circuits, Communications and Signal Processing (NCSP'14), 01 Mar. 2014, [Reviewed]
On the Non-coherent Delay Lock Loop for M-ary/Spread-Spectrum System
Masaya Yamagata; Hiromasa Habuchi
Proceeding of 2014 RISP International Workshop on Nonlinear Circuits, Communications and Signal Processing (NCSP'14), 01 Mar. 2014, [Reviewed]
Effective Code Tracking System for M-ary Orthogonal Modulation SchemeMasaya Yamagata; Hiromasa Habuchi, In this paper, the tracking method for M-ary orthogonal modulation system is used for the internal synchronization system that uses square-low detector. In the system, a pair of pseudo-noise(PN) sequences which consists of the modified pseudo-ternary M-sequence and {-1, 1}-valued M-sequence is used. The modified pseudo-ternary M-sequence is a PN code which combines the {0, 1}-valued M-sequence with the Hadamard code. The S-curve characteristic of the tracking system is much the same as that of the conventional 1Δ-DLL system with {-1, 1}-valued M-sequence. Thus, the M-ary orthogonal modulation system using MPTM can use the DLL used in the DS/SS system. The following performance in channel with the Additive White Gaussian Noise (AWGN) is analyzed and evaluated
(1) The tracking error (jitter) performance and (2) The bit error rate (BER) performance that takes jitter into account. As a result, these performances are better than conventional M-ary orthogonal systems. © 2013 IEEE.
Proceeding of 2013 International Symposium on Intelligent Signal Processing and Communication Systems (ISPACS2013), 14 Nov. 2013,
[Reviewed] Optical N-Parallel Codes-Shift-Keying Using Generalized Modified Prime Sequence Codes and Hadamard CodesYusuke Takamaru; Hiromasa Habuchi, For optical wireless communications with intensity-modulation and direct-detection (IM/DD), the N parallel code shift keying (N-CSK) systems using a pseudo-noise (PN) codes are considered. Since N-CSK has the several PN codes, the data transmission rate and the bit error rate (BER) performance can improve by increasing the number of PN codes. However, the conventional optical PN codes are not suitable for optical N-CSK with IM/DD because the ratio of the number of PN codes and the PN-code length, M/L, is smaller than 1/root L. Therefore, one of serious problems encountered with optical wireless N-CSK with IM/DD is to design the optical PN code.
In this paper, a PN code, which combines the generalized modified prime sequence code (GMPSC) with Hadamard code, is proposed. Moreover, a new N-CSK using the proposed PN code is shown. The proposed PN code can achieve M/L = 1. Therefore, it is expected that the proposed system can achieve high data transmission rate compared with the conventional optical N-CSK systems. Moreover, the bit error rate performance is evaluated under the additive white Gaussian noise channel. It is found that the proposed optical N-CSK outperforms the conventional optical N-CSK system., IEEE
Proceeding of 2013 International Symposium on Intelligent Signal Processing and Communication Systems (ISPACS2013), 14 Nov. 2013,
[Reviewed] Impact of Interference Cancellation Technique on Throughput of Nonorthogonal CSK/SSMA ALOHA System
Nobuyoshi Komuro; Hiromasa Habuchi
Journal of Selected Areas in Telecommunications, Nov. 2013, [Reviewed]
Optical Wireless LDPC-Coded PPM with Unequal Transmission Power Allocation SchemeKyohei Sumikawa; Hiromasa Habuchi, In this paper, the low density parity check(LDPC) coded schemes with unequal transmission power allocation (UTPA) in optical wireless channel is evaluated. In particular, the bit error rate performance of the LDPC coded binary pulse position with UTPA is investigated in the presence of APD noise, thermal noise, scintillation. Consequently, the BER performance of the LDPC coded pulse position modulation with UTPA is better than that of the conventional LDPC coded pulse position modulation. It is found that there is optimum power ratio (R) and optimum R is varied by each average received laser power per slot (P-w). For example, when variance of scintillation is 0.1, the optimum R is 4.0 at P-w =-50[dBm]. Thus, the LDPC coded pulse position modulation with UTPA system is superior to the conventional system with R=1.0., IEEE
Proceeding of 2013 Sixth International Workshop on Signal Design and its Applications in Communications (IWSDA2013), 28 Oct. 2013,
[Reviewed] Design of PN Codes for Optical Wireless Code-Shift-Keying with IM/DDYusuke Takamaru; Hiromasa Habuchi, A pseudo-noise (PN) code used by code shift keying (CSK) for optical wireless communication with intensity-modulation and direct detection (IM/DD) are considered. Since CSK has the several PN codes, the data transmission rate and the bit error rate (BER) performance can improve by increasing the number of PN codes. However, the conventional optical PN codes are not suitable for optical CSK with IM/DD because the ratio of the number of PN codes and the code length of PN code, M/L is smaller than 1/root L. In this paper, a new PN code, which combines the generalized modified prime sequence code (GMPSC) with Hadamard code is proposed. The proposed PN code can achieve M/L - 1. Moreover, the symbol error rate performance is analyzed under the additive white Gaussian noise channel. It is found that CSK with the proposed PN code outperforms the conventional optical CSK system., IEEE
Proceeding of 2013 Sixth International Workshop on Signal Design and its Applications in Communications (IWSDA2013), 28 Oct. 2013,
[Reviewed] On the Modified Pseudo-Ternary M-Sequence PairMasaya Yamagata; Hiromasa Habuchi, In this paper, we described the properties of the modified pseudo-ternary M-sequence (MPTM) pair, which consists of the MPTM and -1, 1-valued M-sequence, such as the generating MPTM pair, the orthogonality, the expansion of MPTM, the cross-correlation, and the S-curve characteristic. MPTM is a PN code which combines the 0, 1-valued M-sequence with the Hadamard code. The S-curve characteristic is the same as that of the conventional direct sequence spread-spectrum (DS/SS) system using M-sequence. Thus, the tracking system with MPTM pair can use that of DS/SS system. © 2013 IEEE., IEEE Computer Society
Proceeding of 2013 Sixth International Workshop on Signal Design and its Applications in Communications (IWSDA2013), 28 Oct. 2013,
[Reviewed] 光無線通信におけるPN符号を用いる階層化変調法羽渕裕真; 小澤佑介, これまでの光無線変調法は1種類の変調法を利用する場合が一般的であり,階層化変調法に関する検討もほとんど行われていない.本論文では,擬似雑音(PN)符号を用いることにより2種類の情報変調法を融合する光階層化変調方式が提案されている.特に,コードシフトキーイング(CSK)と振幅シフトキーイング(ASK)を融合したCSK-ASK方式,CSKとコード数キーイング(CNK)を融合したCSK-CNK方式,マルチパルス・パルス位置変調(MPPM)とCNKを融合したMPPM-CNK方式が提案されている.これらの方式は,信号パターンによって情報伝送する方式と信号電力によって情報伝送する方式を融合したものであり,各変調方式によって伝送距離や必要な同期精度が異なり,通信距離などに応じて受信情報量が異なる階層化が行える.本論文では,同期タイミングが完全である場合と同期誤差がある場合の誤り率特性が示され,各情報変調データを独立に復調できること,2種類の情報変調法の間で性能差があることが示されている., The Institute of Electronics, Information and Communication Engineers
電子情報通信学会論文誌B, 01 May 2013,
[Reviewed],
[Invited] Effectiveness of the network coding with frame slotted ALOHA on VANET
Hiroyuki Higano; Hiromasa Habuchi; Yusuke Kozawa
Proceeding of 2013 RISP International Workshop on Nonlinear Circuits, Communications and Signal Processing(NCSP'13), Mar. 2013, [Reviewed]
Performance Analysis of Multi-pulse PPM for Optical Wireless Hierarchical Transmission SystemYusuke Kozawa; Hiromasa Habuchi, In this paper, the new optical wireless hierarchical modulation scheme is proposed. The proposed system is designed based on multi-pulse pulse-position modulation (MPPM) using modified pseudo orthogonal M-sequence sets as a pseudo-noise code. The symbol error rate (SER) performance is derived taking into account the effect of the scintillation, background-noise, avalanche photo-diode (APD) noise, thermal noise, and signal dependence noise. Data transmission rate is also obtained. Our results show that the data transmission rate performance improves significantly compared with the conventional MPPM system. Moreover, it is found that the proposed system can realize the hierarchical modulation scheme, and the SER performance of the proposed MPPM system can achieve that of the conventional MPPM system by increasing the number of selected slots for MPPM., IEEE
Proceedings of IEEE Workshop on Optical Wireless Communications (OWC2012), 03 Dec. 2012,
[Reviewed] Priority Code Selection Method of The Modified Binary Countdown Scheme for VANETKoichiro Hashiur; Hiromasa Habuchi, A new selection method for the modified binary countdown scheme is proposed in this paper to make more effective use of VANET. The modified binary countdown scheme is fused with the binary countdown and slot distributed schemes. In the selection method, the transmission right of each node is kept equal because the node which transmitted a packet correctly chooses the low priority code. As the results of evaluating the average packet acquisition time and efficiency, we found that this scheme has immediacy and can tolerate changes in the number of nodes., IEEE
Proceedings of The 12th International Conference on ITS Telecommunications (ITST2012), 08 Nov. 2012,
[Reviewed] Analysis of Average Packet Acquisition Time on Wireless Butterfly-typed Network Coding SchemeHiroyuki Higano; Hiromasa Habuchi, In this paper, the wireless butterfly-typed network coding scheme is considered. The average packet acquisition time of the wireless network coding scheme is evaluated by theoretical analysis. The effect of the wireless network coding scheme is shown by comparing with the system without network coding scheme. Consequently, it is shown that the wireless network coding scheme is superior to the system without network coding scheme in the reliable channel environment. However, when the distance between nodes becomes longer, the network coding scheme has no effect on shortening of average packet acquisition time., IEEE
Proceedings of The 12th International Conference on ITS Telecommunications (ITST2012), 07 Nov. 2012,
[Reviewed] A Novel Synchronization Scheme for Bi-orthogonal Modulation Using Modified Pseudo-Ternary M-sequenceMasaya Yamagata; Hiromasa Habuchi, In this paper, the modified pseudo-ternary M-sequence is designed as the orthogonal code set of bi-orthogonal modulation systems. Moreover, the simple code tracking system using the Delay Lock Loop(DLL) and the modified pseudoternary M-sequence is proposed for the bi-orthogonal modulation system. The modified pseudo-ternary M-sequence is a PN code which combines the {0, 1}-valued M-sequence with the Hadamard code. The S-curve characteristic of the proposed system is much the same as that of the conventional 1 Delta-DLL system with {-1, 1}-valued M-sequence. The bit error rate performance in channel with the Additive White Gaussian Noise is evaluated. As a result, it is shown that the proposed system is superior to the conventional system using the synchronizing PN code. It is found that the bit error rate performance can approach the lower bound of bi-orthogonal modulation system., IEEE
Proceedings of 2012 International Symposium on Information Theory and its Applications(ISITA), 30 Oct. 2012,
[Reviewed] Analysis of hierarchical multi-pulse PPM using modified pseudo orthogonal M-sequence setYusuke Kozawa; Hiromasa Habuchi, In this paper, to enhance the data transmission rate of the optical wireless hierarchical transmission system, the new hierarchical modulation scheme is proposed. The proposed system is designed based on multi-pulse pulse-position modulation (MPPM) using modified pseudo orthogonal M-sequence sets as a pseudo-noise code. The symbol error rate (SER) performance is derived taking into account the effect of the scintillation, background-noise, avalanche photo-diode (APD) noise, thermal noise, and signal dependence noise. Our results show that the data transmission rate performance improves significantly compared with the conventional MPPM system. Moreover, it is found that the proposed system can realize the hierarchical modulation scheme, and the SER performance of the proposed MPPM system can achieve that of the conventional MPPM system by increasing the number of slots for MPPM., IEEE
Proceedings of 2012 International Symposium on Information Theory and its Applications(ISITA), 30 Oct. 2012,
[Reviewed] On Bit Error Rates of the LDPC-OOK and LDPC-PPM in Optical Wireless Channel
Kyohei Sumikawa; Hiromasa Habuchi
Proceedings of The 9th IEEE VTS Asia Pacific Wireless Communications Symposium(APWCS), 23 Aug. 2012, [Reviewed]
A Tracking System Using a Differential Detector for M-ary Bi-orthogonal Spread Spectrum Communication SystemsJunya Kawata; Kouji Ohuchi; and Hiromasa Habuchi, As an application of the direct sequence spread spectrum (SS) communication system, there is an M-ary bi-orthogonal SS communication system. In its system, several spreading sequences (bi-orthogonal sequences) are used in a code shift keying basis. Hence, design of the spreading code synchronization system has been an issue in the M-ary bi-orthogonal SS systems. In this paper, the authors focus on a code tracking system using a differential detector and a Delay Lock Loop (DLL). They investigate a tracking performance of their code tracking system by theoretical analysis. In addition, a multi-stage interference canceler is applied to the M-ary bi-orthogonal SS system. As the result, it is shown that the tracking performance of the theoretical analysis is almost the same as that of computer simulations in a multi-user environment. It is also shown that the multi-stage interference canceler is effective in improvement of the BER performance., IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG
IEICE Transaction on Fundamentals, 01 Dec. 2011,
[Reviewed] Optical Wireless N-CSK with Modified Pseudo Orthogonal M-Sequence SetsYusuke Kozawa; Hiromasa Habuchi, In this paper, N-CSK (N parallel Codes Shift Keying) using modified pseudo orthogonal M-sequence sets (MPOMSs) to realize the parallel combinatory spread spectrum (PC/SS) communication system for the optical communications is proposed. Moreover, the upper bound of data transmission rate and the bit error rate (BER) performance of this N-CSK system using the chip-level detection are evaluated through theoretical analysis by taking into account the scintillation, background-noise, avalanche photo-diode (APD) noise, thermal noise, and signal dependence noise. It is shown that the upper bound of data transmission rate of the proposed system is better than those of OOK/CDM and SIK/CDM. Moreover, the upper bound of data transmission rate of the proposed system can achieve about 1.5 [bit/chip] when the code length of MPOMS is 64 [chip]., IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG
IEICE Transaction on Fundamentals, 01 Nov. 2011,
[Reviewed] Orthogonal Exponential Spline Pulses with Application to Impulse Radio
Masaru Kamada; Semih Ozlem and Hiromasa Habuchi
Sampling Theory in Signal and Image Processing, Jul. 2011, [Reviewed]
Repeated-permutation MPPM/CDMA with interference avoidance and cancellationTatsuya Muramatsu; Toshiki Kato; Fumie Ono; Hiromasa Habuchi, To realize the high throughput performance in the optical wireless communications effectively, a Repeated-permutation Multi-pulse Pulse Position Modulation (RMPPM) system with interference avoidance and cancellation is considered. The RMPPM system can transmit the bit data using the repeated-permutation of the slot positions and several orthogonal codes. The RMPPM system can improve the throughput performance of the conventional PPM systems in the single user case. However, with increasing the number of code per frame, Multiple Access Interference (MAI) also increases in the multi-user case. To avoid MAI, we consider a Reduction Rule (RR) of orthogonal codes at a transmitter. On the other hand, we apply an Interference Cancellation (IC) using modified prime codes at a receiver. As results, BER can be greatly improved by RR and IC. The RR and IC is the effective way for the RMPPM system in the multi-user case of optical wireless communication. © 2011 National Institute of Inform.
2011 the 14th International Symposium on Wireless Personal Multimedia Communications: Communications, Networking and Applications for the Internet of Things, WPMC'11, 2011
Multiple Access Performance for Repeated-permutation MPPM with Interference AvoidanceTatsuya Muramatsu; Toshiki Kato; Fumie Ono; Hiromasa Habuchi, To realize the high data transmission rate in the optical wireless communications effectively, a Repeated-permutation Multi-pulse Pulse Position Modulation (RMPPM) system with interference avoidance is considered. The RMPPM system can transmit the bit data by using the repeated-permutation of the slot positions of the orthogonal codes, whereas the conventional Multi-pulse Pulse Position Modulation (MPPM) system can transmit the bit data by using the combination of the slot positions of the orthogonal codes. To avoid Multiple Access Interference (MAI), we consider Reduction Rule (RR) of orthogonal codes at a transmitter. We analyze the Bit Error Rate (BER) performance theoretically. As results, BER can be greatly improved by RR. The RR is effective to the RMPPM system in the multi-user case of optical wireless communication., IEEE
2011 20TH INTERNATIONAL CONFERENCE ON COMPUTER COMMUNICATIONS AND NETWORKS (ICCCN), 2011,
[Reviewed] Orthogonal exponential spline pulses for impulse radio communications
Masaru KAMADA; Semih ÖZLEM; Hiromasa HABUCHI
Proceedings of the 36th Annual Conference of the IEEE Industrial Electronics Society, Glendale, Arizona, 09 Nov. 2010, [Reviewed]
Performance of DS/SS system using pseudo-ternary M-sequencesRyo Enomoto; Hiromasa Habuchi; Koichiro Hashiura, In this paper, newly-found properties of the pseudoternary maximum-length shift register sequences (pseudo-ternary Msequences) are described. In particular, the balance properties, the runlength distribution, the cross-correlation properties, and the decimation relationships are shown. The pseudo-ternary M-sequence is obtained by subtracting the one-chip shifted version from the {+1, -1}-valued M-sequence. Moreover, in this paper, performances of the direct sequence spread spectrum (DS/SS) system using the pseudo-ternary M-sequence are analyzed. In the performance evaluation, tracking error performance (jitter) and bit error rate (BER) performance that takes the jitter into account in DS/SS system with a pseudo-ternary M-sequence non-coherent DLL are evaluated. Using the pseudo-ternary M-sequence instead of the conventional M-sequences can improve the tracking error performance about 2.8 [dB]. Moreover, BER of the DS/SS system using the pseudo-ternary M-sequence is superior about 0.8 [dB] to that using the {+1, -1}-valued M-sequence. Copyright © 2010.
IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences, Nov. 2010,
[Reviewed] A Comparison of Wireless Optical CDMA Systems using Chip-Level DetectionYusuke Kozawa; Hiromasa Habuchi, In this paper the optimum combination of optical pseudo noise (PN) code and modulation scheme to achieve high total data transmission rate is presented Moreover the bit error rate (BER) performance of a wireless OCDMA system using chip level detection is evaluated through theoretical analysis in the multi user case It is shown that in a wireless OCDMA system with chip level detection the total data transmission rate of a multi pulse pulse position modulation (MPPM) systems with optical pseudo noise code generated by an M sequence is better than that of an MPPM system with optical orthogonal code and that of an MPPM system with an extended prime code sequence Moreover the total data trans mission rate of an MPPM/SIK system using modified pseudo orthogonal M sequence sets can achieve more than 10 [bit/chip], IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG
IEICE Transaction on Fundamentals,, 01 Nov. 2010,
[Reviewed] Performance of DS/SS System using Pseudo-Ternary M-SequencesRyo Enomoto; Hiromasa Habuchi; Koichiro Hashiura, In this paper newly found properties of the pseudo ternary maximum length shift register sequences (pseudo ternary M sequences) are described In particular the balance properties the run length distribution the cross correlation properties and the decimation re lationships are shown The pseudo ternary M sequence is obtained by sub tracting the one chip shifted version from the {+1 -1} valued M sequence Moreover in this paper performances of the direct sequence spread spec trum (DS/SS) system using the pseudo ternary M sequence are analyzed In the performance evaluation tracking error performance (Jitter) and bit error rate (BER) performance that takes the jitter into account in DS/SS system with a pseudo ternary M sequence non coherent DLL are evalu ated Using the pseudo ternary M sequence instead of the conventional M sequences can Improve the tracking error performance about 2 8 [dB] Moreover BER of the DS/SS system using the pseudo ternary M sequence is superior about 08 [dB] to that using the {+1 -1} valued M sequence, IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG
IEICE Transaction on Fundamentals, 01 Nov. 2010,
[Reviewed] Study on the Code Acquisition and Tracking Systems Using Pseudo-ternary M-sequencesRyo Enomoto; Hiromasa Habuchi, In this paper, a code acquisition and tracking system using pseudo-ternary maximum-length shift register sequence (pseudo-ternary M-sequence) is proposed. The pseudo-ternary M-sequence is based on the M-sequence and generated by very simple methods. In the code tracking part of the proposed system, a delay-locked loop (DLL) referring the pseudo-ternary Msequence is used. The DLL using the pseudo-ternary M-sequence can improve a tracking error performance by comparison with the DLL using the M-sequence. In the code acquisition part, a rectified pseudo-ternary M-sequence and the {-1, +1}-valued M-sequence are used. Because of the rectification, the proposed system realizes an acquisition scheme that is independent of polarity of a received sequence. Moreover, since a cross-correlation function of the pseudo-ternary M-sequence and the {-1, +1}- valued M-sequence shows a pseudo-orthogonal relation, a probability of a false alarm of the proposed system can be smaller than the conventional sliding correlator using Manchester-coded M-sequences. © 2010 IEEE.
Proceedings of The International Symposium on Information Theory and its Applications and International Symposium on Spread Spectrum Techniques and Applications, 20 Oct. 2010,
[Reviewed] Theoretical Analysis of Optical Wireless CDMA with Modified Pseudo Orthogonal M-sequence SetsYusuke Kozawa; Hiromasa Habuchi, In this paper, to increase normalized throughput of the optical wireless code-division multiple-access (CDMA) system, modified pseudo orthogonal M-sequences (MPOMS) are considered as optical pseudo-noise (PN) code. Moreover, the bit error rate (BER) performance of the optical wireless CDMA system using multi-pulse pulse position modulation (MPPM) is also derived in the presence of the scintillation, background-noise, avalanche photo-diode (APD) noise, thermal noise and signal dependence noise. Consequently, the BER performance in consideration of normalized throughput of the MPPM system with MPOMS is superior to that of the MPPM system with conventional pseudo orthogonal M-sequences in the single-user case and multi-user case., IEEE
IEEE Global Communications Conference (IEEE GLOBECOM'09), Dec. 2009,
[Reviewed] Performance of the asynchronous push type packet compensation methods for road-to-vehicle broadcasting systemKoichiro Hashiura; Hiromasa Habuchi, The push-type packet compensation protocol using the random slot/code selection method have been proposed and evaluated in the synchronous case. However, it is difficult to synchronize between all users. In this paper, the push-type packet compensation protocol using the random slot/code selection method is evaluated by the computer simulation in the asynchronous case. As the results, the random slot/code selection method is effective in the error control method of the road-to-vehicle broadcasting system., IEEE
International Technical Conference of IEEE Region 10 (TENCON2009), Nov. 2009,
[Reviewed] Construction of hierarchical optical broadcasting systems for intelligent transport systemYusuke Oka; Hiromasa Habuchi, The local broadcast systems, that transmit both the wide-area information and the local-area information, are proposed. A nearby user, which is near to the broadcasting station, demodulates together the wide-area information and local-area information. Even if a distant user, which is far to the station, does not receive the local-area information, it is expected that he receives wide-area information only. In the proposed systems, the broadcast information is hierarchized by combining the two modulation scheme. In particular, the two proposed systems are described; the ASK-CSK system which combines amplitude-shift-keying(ASK) with code-shift-keying(CSK) and the CNK-CSK system which combines code-number-keying(CNK) with CSK. The CNK-CSK system is superior to the ASK-CSK system., IEEE
International Technical Conference of IEEE Region 10 (TENCON2009), Nov. 2009,
[Reviewed] Analysis of wireless optical CDMA using chip-level detectionYusuke Kozawa; Hiromasa Habuchi, In this paper, to achieve high maximum throughput performance, the optimum combination of the optical PN code and modulation scheme is presented. Moreover, bit error rate (BER) performances of the wireless OCDMA system using chip-level detection are evaluated from the theoretical analysis in the multi-user case. Consequently, in the wireless OCDMA system with the chip-level detection, the maximum throughput performance of the multi-pulse PPM (MPPM) systems with the optical pseudo noise code generated by M-sequence is better than that of the MPPM systems with optical orthogonal code and that of the MPPM system with extended prime code sequence., IEEE
International Workshop on Signal Design and its Application in Communications (IWSDA 2009), Oct. 2009,
[Reviewed] Properties of the pseudo-ternary M-sequencesRyo Enomoto; Hiromasa Habuchi, This paper is described the properties of the pseudo-ternary M-sequence such as the periodic autocorrelation function, the balance properties, the preferred pairs and so on. This paper is also discussed the tracking performances of the Spread Spectrum (SS) systems with the delay locked loop (DLL) using the pseudo-ternary M-sequence. As a result, the tracking error performance can be improved by the pseudo-ternary M-sequence as compared with the performance of the system with the M-sequences., IEEE
International Workshop on Signal Design and its Application in Communications (IWSDA 2009), Oct. 2009,
[Reviewed] Throughput analysis of the nonorthogonal CSK/SS random access system on communication between usersNobuyoshi Komuro; Hiromasa Habuchi, The advanced wireless communications such as the sensor networks and ad-hoc networks requires the communications system that is flexible about the transmission power control and robust over multiple access interference. We have showed that the throughput of Code Shift Keying (CSK) random access network is high with the transmission power control. However, it is difficult to use transmission power control into the communication between users. This paper presents the throughput performance of the CSK random access network without transmission power control by theoretical analysis. This paper also presents the effect of dynamic assignment of PN sequence. In particular, we derive the throughput when each user select one of the plural PN sequences randomly. Consequently, the throughput of CSK random access network is better than that of the conventional system., IEEE
2009 IEEE International Symposium on Personal Indoor and Mobile Radio Communications (IEEE PIMRC 2009), Sep. 2009,
[Reviewed] Repeated Permutation Multi-Pulse PPM for Optical Wireless Communication
Toshiki Kato; Fumie Ono; Hiromasa Habuchi
The 24th International Technical Conference on Circuits/Systems, Computers and Communications (ITC-CSCC 2009), Jul. 2009, [Reviewed]
Code Shift Keying/Spread-Spectrum Communication Methods Using Pseudoternary M-SequencesHASHIURA Koichiro; HABUCHI Hiromasa, 本論文では,擬3進M系列を用いるコードシフトキーイング型スペクトル拡散通信(Code Shift Keying/Spread-Spectrum : CSK/SS)方式を提案し,同期システムとして遅延ロックループ(Delay Lock Loop : DLL)を用いた場合の同期タイミング追跡誤差(ジッタ)性能及びそのジッタ性能を考慮したビット誤り率特性を理論解析している.本論文で用いる擬3進M系列は,±1からなるM系列とそのM系列を巡回シフトした系列を逆相加算することで得られる.位相差±2チップ間の周期自己相関特性は,マンチェスタ符号化M系列の理想的な特性と同一であり,ジッタ性能の向上が期待できる.解析した結果,擬3進M系列は,従来の1△型DLLの同期ジッタを小さく抑えることができることが示されている.また,ジッタ性能を考慮したビット誤り率(Bit Error Rate : BER)は,BER=10^<-6>を達成する理想的なCSK/SS方式のE_b/N_Oから1.0[dB]以内の劣化に抑えられることが示されている., The Institute of Electronics, Information and Communication Engineers
The IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences (Japanese edition) A, May 2009,
[Reviewed] Enhancement of Optical Wireless Multi-Pulse PPMYusuke Kozawa; Hiromasa Habuchi, In this paper, optical wireless multi-pulse pulse position modulation (MPPM) system with modified pseudo orthogonal M-sequence sets is proposed. Moreover, the symbol error rates of the proposed system are analyzed by taking into account the scintillation, background-noise, avalanche photo-diode (APD) noise, thermal noise, and signal dependence noise in the single-user case. Consequently, the normalized throughput in consideration of SER of the proposed system is superior to that of the conventional MPPM systems. Furthermore, the normalized throughput of the proposed system can achieve about 1.25 [bit/chip]., IEEE
IEEE Global Communications Conference (IEEE GLOBECOM'08), Dec. 2008,
[Reviewed] Increased throughput using optical PPM-CDMAYusuke Kozawa; Hiromasa Habuchi, In this paper, to increase normalized throughput of pulse position modulation (PPM) in the optical CDMA system, the optical Multi-pulse PPM (MPPM) system with modified pseudo orthogonal M-sequence sets is proposed. Result from theoretical analysis of bit error rate (BER) performance of the proposed system is also presented. Consequently, the normalized throughput and BER of the proposed system axe better than those of the conventional MPPM system with the pseudo orthogonal M-sequences. Furthermore, BER of the proposed system is also superior to those of the conventional systems., IEEE
International Symposium on Information Theory and Its Applications (ISITA'08), Dec. 2008,
[Reviewed] Performance of the slot-distributed push-type packet compensation protocol for the road to vehicle broadcasting systemKoichiro Hashiura; Hiromasa Habuchi, In this paper, the road to vehicle broadcasting system are considered. As the error control protocol of this system, the push-type packet compensation protocol using Spread-Spectrum have been proposed. However, when the number of users increasing significantly, the average packet acquisition time of this protocol deteriorates by the packet collision. In order to overcome this problem, the slot-distributed push-type packet compensation protocol is proposed and analyzed. Consequently, it is shown that the proposed protocol is effective on the high user density., IEEE
International Symposium on Information Theory and Its Applications (ISITA'08), Dec. 2008,
[Reviewed] Throughput evaluation of the the nonorthogonal CSK/CDMA ALOHA with interference cancelerNobuyoshi Komuro; Hiromasa Habuchi; Toshinori Tsuboi, Nonorthogonal Code Shift Keying Code Division Multiple Access (CSK/CDMA) ALOHA is expected to improve the throughput in advanced wireless network, such as sensor networks and ad-hoc networks. The throughput of the nonorthogonal CSK/CDMA ALOHA is expected to get better by introducing the interference cancellation technique. It is not clear how much the throughput improved by introducing the interference canceler. This paper presents the throughput performance of the nonorthogonal CSK/CDMA ALOHA with the interference canceler by theoretical analysis. Consequently, it is found that the throughput performance of our system is over 1.0., IEEE
International Symposium on Information Theory and Its Applications (ISITA'08),, Dec. 2008,
[Reviewed] Construction of orthogonal overlapping pulses for impulse radio communicationsMasaru Kamada; Semih O"ZLEM; Hiromasa Habuchi, A procedure is developed to construct a time-limited pulse for its use in the short-range impulse radio communications. The evennumbered shifts of the pulse constitute a train of overlapping pulses. The pulses are intentionally made orthogonal to the second derivative of one another. This orthogonality makes it possible to detect the received pulses, which are assumed to be the second derivative of the transmitted pulses, by means of correlation with the original pulses. An example pulse is presented that complies with the FCC regulation for indoor ultra-wide bandwidth radio communications. Copyright © 2008 The Institute of Electronics, Information and Communication Engineers., Institute of Electronics, Information and Communication, Engineers, IEICE
IEICE Transaction on Fundamentals, Dec. 2008,
[Reviewed] Nonorthogonal CSK/CDMA with received-power adaptive access control schemeNobusyoshi Komuro; Hiromasa Habuchi; Toshinori Tsuboi, The measurements for Multiple Access Interference (MAI) problems and the improvement of the data rate are key issues on the advanced wireless networks. In this paper, the nonorthogonal Code Shift Keying Code Division Multiple Access (CSK/CDMA) with received-power adaptive access control scheme is proposed. In our system, a user who is ready to send measures the received power from other users, and then the user decides whether to transmit or refrain from transmission according to the received power and a pre-decided threshold. Not only overcoming the MAI problems, but our system also improve the throughput performance. The throughput performance of the proposed system is evaluated by theoretical analysis. Consequently, the nonorthogonal CSK/CDMA system improves by applying received-power adaptive access control. It was also found that the throughput performance of the nonorthogonal CSK/CDMA system is better than that of the orthogonal CSK/CDMA system at any
Eb/
N0. We conclude that the nonorthogonal CSK/CDMA system with received-power adaptive access control scheme is expected to be effective in advanced wireless networks., The Institute of Electronics, Information and Communication Engineers
IEICE Transaction on Fundamentals, Oct. 2008,
[Reviewed] Effect of the slot distributed scheme on the push-type packet compensation protocol
Koichiro Hashiura; Hiromasa Habuchi
The 23rd International Technical Conference on Circuits/Systems, Computers and Communications (ITC-CSCC2008), Jul. 2008, [Reviewed]
Effect of the interference canceler on the nonorthogonal CSK/CDMA ALOHA
Nobusyoshi Komuro; Hiromasa Habuchi; Toshinori Tsuboi
The 23rd International Technical Conference on Circuits/Systems, Computers and Communications (ITC-CSCC2008), Jul. 2008, [Reviewed]
Modified pseudo orthogonal M-sequence sets for synchronous optical-CDMA
Yusuke Kozawa; Hiromasa Habuchi
The 23rd International Technical Conference on Circuits/Systems, Computers and Communications (ITC-CSCC2008),, Jul. 2008, [Reviewed]
Theoretical Analysis of Atmospheric Optical DS/SS with On-Off Orthogonal M-sequence PairsYusuke Kozawa; Hiromasa Habuchi, In this paper, atmospheric optical DS/SS systems with On-Off Orthogonal M-sequence Pairs are considered. The bit error rates of the On-Off Keying (OOK) DS/SS and the antipodal DS/SS are analyzed by taking into account the scintillation, background-noise, avalanche photo-diode (APD) noise, thermal noise, and multiple access interference (MAI). Moreover, the optical DS/SS systems using on-off orthogonal M-sequence pairs are compared with those using the extended prime code sequences. Consequently, the optical DS/SS using the on-off orthogonal M-sequence pairs is superior to the optical DS/SS using extended prime code sequences., IEEE
Proceeding of Sixth International Conference on Information Communications and Signal Processing, Dec. 2007,
[Reviewed] Performance Analysis of Pull-Type Packet Compensation Protocol with Perfect MCS/CDMA for the Broadcasting SystemKoichio Hashiura; Hiromasa Habuchi, The purpose of this paper is to analyze the pull-type packet compensation protocol with perfect Multi-Code Sense Code Division Multiple Access (MCS/CDMA). MCS/CDMA is the access control that the user who transmits the packet estimates the unused code and the packet is spread by the code. In this paper, the average packet acquisition time and the average number of remaining unsuccessful users after n compensation procedures are analyzed. Moreover, the pull-type packet compensation protocol using MCS is compared with the pull-type packet compensation protocol using random code selection. As the results, MCS/CDMA is effective in the pull-type packet compensation protocol for broadcasting service because the average packet acquisition time of MCS/CDMA is shorter than that of random code selection., IEEE
Proceeding of Sixth International Conference on Information Communications and Signal Processing, Dec. 2007,
[Reviewed] Throughput Evaluation of the nonorthogonal CSK ALOHA with the Received-Power Adaptive Access Control SchemeNobusyoshi Komuro; Hiromasa Habuchi; Toshinori Tsuboi, In this paper, the nonorthogonal Code Shift Keying (CSK) ALOHA with received-power adaptive access control scheme is investigated and evaluated. In our system, when transmitting a packet, each user senses the received power from other users. Then the user decides whether to transmit or refrain from transmission according to the received power and a pre-decided threshold. Not only overcoming the Multiple Access Interference (MAI) problems, but our system also improves the throughput performance. The throughput performance of the proposed system is evaluated by theoretical analysis. Especially, the throughput performance is analyzed in consideration of free space loss. As a result, it is found that our system shows better performance than the conventional scheme., IEEE
Proceeding of Sixth International Conference on Information Communications and Signal Processing, Dec. 2007,
[Reviewed] Throughput Analysis of the Channel Estimation-Oriented Access Control Scheme on CSK/CDMANobusyoshi Komuro; Hiromasa Habuchi; Toshinori Tsuboi, In our work, the channel estimation-oriented access control scheme has been investigated. In the system, each user estimates the channel based on the received power, and then decides whether to transmit the packet or refrain from transmission. However, each user can not estimate the channel completely because it is not practical that all users receive the signals with equal power. The purpose of this paper is to investigate the throughput performance of the scheme in consideration of free space loss. It is found that the scheme shows better performance than the conventional scheme even when free space loss occurs. It is also found that the probability of decision, which shows the best throughput, is different depending on offered load., IEEE
Proceeding of IEEE International Symposium on Personal Indoor and Mobile Radio Communications, Sep. 2007,
[Reviewed] Theoretical Analysis of Atmospheric optical PPM CDMA with Pseudo Orthogonal M-sequencesYusuke Kozawa; Hiromasa Habuchi, in this paper, the atmospheric optical code-division multiple-access (CDMA) system with Pseudo-orthogonal M-sequences is proposed. The bit error rate (BER) of the proposed system using pulse position modulation (PPM) by taking into account the effects of the scintillation, avalanche photo-diode (APD) noise, thermal noise, and multiple access interference (MAI) are analyzed. By comparing with the optical orthogonal code (OOC) and the prime code, the proposed system with pseudo-orthogonal M-sequences is better than the systems with other PN codes. But, the scintillation has an enormous effect on the performance of the proposed system., IEEE
Proceeding of IEEE International Symposium on Personal Indoor and Mobile Radio Communications, Sep. 2007,
[Reviewed] Theoretical Analysis of Spread-Spectrum Push/Pull Type Packet Compensation Protocol on Local Broadcasting ServicesKoichio Hashiura; Hiromasa Habuchi, The purpose of this paper is to compensate loss packet in the broadcasting system using road to vehicle communications (RVC). Authors have proposed and evaluated the push-type and pull-type packet compensation protocol. These protocols are the loss packet compensation protocol using inter-vehicle communications (IVC). In this paper, the push/pull-type packet compensation protocol with common spreading sequences for broadcasting system is proposed. The average packet acquisition time is analyzed. By comparing with the pull-type packet compensation protocol, the push/pull-type packet compensation protocol is more efficient than the pull-type packet compensation protocol., IEEE
Proceeding of IEEE International Symposium on Personal Indoor and Mobile Radio Communications, Sep. 2007,
[Reviewed] Cardinal spline pulses for impulse radio communications
Masaru KAMADA; Semih ÖZLEM; Hiromasa HABUCHI
CD-ROM of the International Workshop on Sampling Theory and Application 2007, Thessaloniki(Greece), Jul. 2007, [Reviewed]
Influence of Channel Estimation Error on Throughput Performance in the Channel Estimation-Oriented Access Control Scheme with Code Shift KeyingNobuyoshi Komuro; Hiromasa Habuchi; Toshinori Tsuboi, In our work, channel estimation-oriented access control scheme has been investigated. In the system, each user estimates the channel based on the power which the user receives from other users, and then decides whether to transmit the packet or refrain from transmission with a certain probability. However, each user can not estimate the channel completely. The purpose of this paper is to investigate the influence of channel estimation error. It is found that the throughput performance is influenced by the channel estimation error. It is also found that the throughput performance of the system with the access control scheme is better that of the conventional system even though we consider the channel estimation error., IEEE
Tenth International Conference on Communication Systems (ICCS 2006), Nov. 2006,
[Reviewed] Performance evaluation of the pull-type packet compensation protocol with common spreading sequences for broadcasting systemKoichiro Hashiura; Hiromasa Habuchi, The purpose of this paper is to evaluate performance of the pull-type packet compensation protocol with common spreading sequences by theoretical analysis. This protocol is the loss packet compensation scheme for broadcasting services using road to vehicle communications (RVC). In this paper, the blocking probability, the average time to complete compensation and the average number of packet transmissions are analyzed. As the result, the pull-type packet compensation protocol outperforms the push-type packet compensation protocol., IEEE
Tenth International Conference on Communication Systems (ICCS 2006), Nov. 2006,
[Reviewed] Spread Spectrum Modified MPPM System using Quadriphase SequencesFumie Ono; Hiromasa Habuchi; Kouji Ohuchi, In this paper, the spread spectrum modified multipulse pulse position modulation (SS-MMPPM) system is considered. The system uses quadriphase sequences that enhance even-shift orthogonal sequences (E-sequences) as spreading code. Moreover, the frame synchronization methods of the SS-MMPPM system are considered. the method is classified into two methods: the method with the preamble signal (Type A) and the method without the preamble signal (Tape B). In this paper, the following performances are evaluated: the data transmission rate, the synchronization performance and the efficiency. Consequently, the data transmission rate of type B is higher than that of the type A. Moreover, the probability of frame detection of type B is better than that of type A., IEEE
Tenth International Conference on Communication Systems (ICCS 2006), Nov. 2006,
[Reviewed] Performance of Enhanced PSM/CSK System using Quariphase E-sequencesFumie Ono; Hiromasa Habuchi; Kouji Ohuchi, In this paper, a system based on pulse spacing modulation and code shift keying is considered. The system uses quadriphase even-shift orthogonal sequences (E-sequences) as orthogonal sequence. The auto-correlation value of the quadriphase sequence is better than that of the biphase E-sequence. In this paper, the probability of block error and efficiency are shown. The probability of block error can improve and the efficiency is greater than that of the SS-PPM system. © 2006 IEEE.
2006 IEEE International Symposium on Personal Indoor and Mobile Radio Communications (PIMRC 2006), Sep. 2006,
[Reviewed] Embedded Frame Synchronization Method for Pulse Position Modulation SystemFumie Ono; Hiromasa Habuchi, The objective of this paper is to propose the Pulse Position Modulation (PPM) system which embeds the synchronizing signal in the information frame. In the proposed system, the frame for transmitting information is also the frame for acquiring frame timing. The data transmission rate of the proposed system is independent of the length of the synchronization signal because the proposed system does not require the synchronization frame. The data transmission rate and the synchronization performance for the proposed system are better than those of the conventional system., IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG
IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES, Jun. 2006,
[Reviewed] Effect of Access Control Scheme based on the Estimation of Offered Load on the CSK/SS Random Access SystemsNobuyoshi Komuro; Hiromasa Habuchi, In this paper, an access control scheme on the Code Shift Keying Spread Spectrum (CSK/SS) random access systems is evaluated. In this system, each user estimates the number of transmitting users based on the received power and decides whether to transmit a packet or not. When a user becomes ready to send, the user estimates the number of transmitting users. If it is equal or less than a certain threshold, a, the user transmits a packet with a probability p = 1. Otherwise, the user transmits a packet with 0 <= p < 1. Consequently, it is found that the throughput performance of the CSK/SS random access system improves by applying this access control scheme., IEEE
Asia-Pacific Conference on Communications 2005, Oct. 2005,
[Reviewed] Design of UWB Pulses in Terms of B-SplinesMitsuhiro Matsuo; Masaru Kamada; and Hiromasa Habuchi, The present paper discusses a new construction of UWB pulses within the framework of soft-spectrum adaptation., The employed basis functions are B-splines having the following properties: (i) The B-splines are time-limited piecewise polynomials. (ii) The, first-order B-splines are rectangular pulses and they converge band-limited functions at the limit that their order tends to infinity. (iii) There are an analog circuit and a fast digital filter for the generation of B-splines. Simple application of Gram-Schmidt orthonormalization process to the shifted B-splines results in a few basic pulses, which are well time-limited and have a broad band width, but do not comply with the FCC spectral mask. A constrained approximation technique is proposed for adaptively designing pulses so that they approximate target frequency characteristics. At the cost of using eleven shifted B-splines, an example set of four pulses comforting the FCC spectral mask is obtained., IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG
The Transactions of the Institute of Electronics, Information and Communication Engineers, Sep. 2005,
[Reviewed] Novel Code Selecting/Spacing ALOHA SystemFumie Ono; Hiromasa Habuchi; and Tsuyoshi Arai, In this paper, a code selecting/spacing ALOHA system is proposed. The proposed system not only use Nm spreading codes but also M time slots. The proposed system varies in packet size from KNmT c to KMNmTc, where K is the number of symbols per packet and Tc is the chip duration. So, the length of the packet for the proposed system changes according to the source data although the message bits per packet are constant. The number of symbols per packet of the proposed system is smaller than that of the conventional Direct Sequence Spread Spectrum Multiple Access (DS/SSMA) ALOHA system. Therefore, the proposed system is expected for improving the throughput performance of the conventional DS/SSMA ALOHA system. In the result of the throughput performance evaluation on the Additive White Gaussian Noise(AWGN) channel, it is shown that the throughput performance of the proposed system is about 2 times higher than that of the DS/SSMA ALOHA system. © 2005 IEEE.
16th Annual IEEE International Symposium on Personal Indoor and Mobile Radio Communications, Sep. 2005,
[Reviewed] PPM Systems that Embedded Frame Timing Signal
Fumie Ono; Hiromasa Habuchi
2005 International Symposium on Wireless Personal Multimedia Communications, Sep. 2005, [Reviewed]
Locally supported cardial splines biorthogonal when shifted by every two knots
Mitsuhiro Matsuo; Masaru Kamada; Hiromasa Habuchi
Preprints of the 2005 International Workshop on Sampling Theory and Applications, 10 Jul. 2005
Throughput Evaluation of the CSK/SS Packet Radio Communications with Access Control Scheme based on the Estimation of Offered Load
Nobuyoshi Komuro; Hiromasa Habuchi
2005 International Technical Conference on Circuits/Systems, Computers and Communications, Jul. 2005, [Reviewed]
Frame Synchronization for PPM Systems
Fumie Ono; Hiromasa Habuchi
2005 International Technical Conference on Circuits/Systems, Computers and Communications, Jul. 2005, [Reviewed]
Proposal of a Simple Synchronization Method foe CSK/SSAzumi Ito; Hiromasa Habuchi; Fumie Ono, In this paper, a new tracking method for Code Shift Keying Spread Spectrum (CSK/SS) is proposed. In the CSK/SS systems, since the transmitted sequences vary at every frame, synchronization is difficult. In the proposed method, a pair consists of the Manchester-coded PN sequence and the non-Manchester-coded PN sequence as the synchronizing sequence. The cross-correlation characteristic of the pair is used instead of the S-curve of delay lock loop (DLL). The receiver can track the signal timing by using the characteristic. The proposed method is applied to the external synchronization system whose structure is simple. The following performance in channel with the Additive White Gaussian Noise (AWGN) is analyzed and evaluated; (1) the tracking error (jitter) performance and (2) the bit error rate (BER) performance that takes the jitter into account. As a result. the jitter of the proposed system is better than those of the conventional DLL systems as E-b/N-0 increases. The jitter of the proposed system has less degradation than those of the conventional systems, even if the number of users increases. Moreover, BER of the proposed system is similar to that of the I Delta-DLL system and superior to that of the 2 Delta-DLL system., IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG
The Transactions of the Institute of Electronics, Information and Communication Engineers, Jun. 2005,
[Reviewed] A Reasonable Throughput Analysis of the CSK/SSMA unslotted ALOHA system with nonorthogonal sequencesNobuyoshi Komuro; Hiromasa Habuchi, In this paper, the throughput performance of the CSK/SSMA ALOHA system with nonorthogonal sequences which combines the ALOHA system with Code Shift Keying using nonorthogonal sequences is analyzed. In this system, the nonorthogonal sequences are constructed by concatenating M-con orthogonal sequences. The throughput performance of the CSK/SSMA ALOHA system with nonorthogonal sequences is analyzed in consideration that the number of packets changes at intervals of one orthogonal sequence. Moreover, the throughput performance of our system with Channel Load Sensing Protocol (CLSP) is also analyzed. We also examine the influence of unreachable control signal of CLSP. Consequently, it is found that the throughput performance of our system decreases significantly by this analysis. It is also found that the throughput performance of our system improves greatly by using CLSP. However, the unreachable control signal affects the throughput performance of this system, seriously., IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG
The Transactions of the Institute of Electronics, Information and Communication Engineers, Jun. 2005,
[Reviewed] Design of UWB pulses based on B-splinesMitsuhiro Matsuo; Masaru Kamada; Hiromasa Habuchi, The present paper discusses construction of UWB pulses on the basis of B-splines having the following properties: (i) The B-splines are time-limited piecewise polynomials. (ii) They are rectangular pulses when their order is one and they converge to band-limited functions at the limit that their order tends to infinity. (iii) There are an analog circuit and a fast digital filter for the generation of B-splines. A constrained minimization technique is proposed for designing pulses so as to comfort the FCC spectral mask and satisfy basic requirements for UWB pulses. © 2005 IEEE.
The 2005 IEEE International Symposium on Circuits and Systems, May 2005,
[Reviewed] Design of UWB pulses by spline approximationMitsuhiro Matsuo; Masaru Kamada; Hiromasa Habuchi, The present paper discusses a new construction of UWB pulses within the framework of soft-spectrum adaptation. The employed basis functions are B-splines having the following properties: (i) The B-splines are time-limited piecewise polynomials. (ii) The first-order B-splines are rectangular pulses and they converge band-limited functions at the limit that their order tends to infinity. (iii) There are an analog circuit and a fast digital filter for the generation of B-splines. A constrained approximation technique is proposed for adaptively designing pulses so that they approximate target frequency characteristics. At the cost of using eleven shifted B-splines, an example set of four pulses comforting the FCC spectral mask is obtained., IEEE
2005 IEEE Wireless Communications and Networking Conference, 16 Mar. 2005,
[Reviewed] A study of the three-valued CSK spread ALOHA systemYusuke Ogose; Tsuyoshi Arai; Hiromasa Habuchi; Hiroshi Inai, The new spread ALOHA system based on the multi level transmission technique is proposed. The spread ALOHA system with the three-valued signaling and Code Shift Keying (CSK) are combined in the proposed system. This system can reduce the packet length of the spread ALOHA system without extension of the frequency bandwidth. It is expected to improve the system performance. In this paper, the throughput performance of the proposed system are evaluated by theoretical analysis. Moreover, throughput performances of the spread ALOHA systems without CSK are compared. It is shown that the proposed system is superior to conventional spread ALOHA systems when E-b/N-0 is larger than 10[dB]., IEEE
APSITT 2005: 6th Asia-Pacific Symposium on Information and Telecommunication Technologies, Proceedings, 2005,
[Reviewed] Design of UWB pulses based on B-splinesM Matsuo; M Kamada; H Habuchi, The present paper discusses construction of UWB pulses on the basis of B-splines having the following properties: (i) The B-splines are time-limited piecewise polynomials. (ii) They are rectangular pulses when their order is one and they converge to band-limited functions at the limit that their order tends to infinity. (iii) There are an analog circuit and a fast digital filter for the generation of B-splines. A constrained minimization technique is proposed for designing pulses so as to comfort the FCC spectral mask and satisfy basic requirements for UWB pulses., IEEE
2005 IEEE INTERNATIONAL SYMPOSIUM ON CIRCUITS AND SYSTEMS (ISCAS), VOLS 1-6, CONFERENCE PROCEEDINGS, 2005,
[Reviewed] On the Frame Structure of the Spread ALOHA System using Three-Valued Signaling
Tsuyoshi Arai; Hiromasa Habuchi
The 2004 International Symposium on Information Theory and its Applications (ISITA 2004), Oct. 2004, [Reviewed]
On the Frame Synchronization Method for Pulse Position Modulation System
Fumie Ono; Hiromasa Habuchi
The 2004 International Symposium on Information Theory and its Applications (ISITA 2004), Oct. 2004, [Reviewed]
CSK/SSMA ALOHA system with nonorthogonal sequencesNobuyoshi Komuro; Hiromasa Habuchi; Masaru Kamada, In this paper, the CSK/SSMA ALOHA system with nonorthogonal sequences which combines the ALOHA system with Code Shift Keying (CSK) using nonorthogonal sequences is proposed. The throughput performance was evaluated by theoretical analysis. Moreover, the throughput performance of the system is compared with those of the DS/SSMA ALOHA and M-ary/SSMA ALOHA systems. It is found that the throughput performance of our system to be better than those of the other two systems., IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG
The Transactions of the Institute of Electronics, Information and Communication Engineers, Oct. 2004,
[Reviewed] Proposal of a time-hopping modified multipulse PPM system with restricted amplitude levelsFumie Ono; Hiromasa Habuchi, In this paper, a time-hopping modified pulse spacing modulation system with restricted amplitude levels is proposed. The proposed system combines the multipulse pulse position modulation (MPPM) system with code shift keying. The average frame length of the transmitted signal for the proposed system not only becomes shorter than that for the MPPM system, but the amplitude of the transmitted signal are restricted to 2 levels. The basic performance of the proposed system is evaluated by theoretical analysis. As a result, the data transmission rate of the proposed system is 2.4 times higher than that of the Spread-Spectrum Pulse Position Modulation (SS-PPM) system. The probability of block error that takes into account the synchronization performance can reach the lower bound by making use of the preamble signal. Moreover, the spectral efficiency of the proposed system is 1.8 times greater than that of the SS-PPM system. © 2004 IEEE.
IEEE International Symposium on Spread Spectrum Techniques and Applications (ISSSTA 2004), Sep. 2004,
[Reviewed] A Study on the Repeated Permutation MPPM/SS System
Fumie Ono; Hiromasa Habuchi
The 2004 International Technical Conference on Circuits/Systems, Computers and Communications(ITC-CSCC2004), Jul. 2004, [Reviewed]
New pulse spacing modulation based on spread-spectrum communication schemeFimie Ono; Hiromasa Habuchi, A spread-spectrum pulse spacing modulation (SS-PSM) system, which combines a pulse spacing modulation system with the spread-spectrum (SS) communication schemes, is proposed. In the proposed system, the information to be transmitted is represented by the number of slots between the previous and the present spreading code. The preamble signal is used for block synchronisation, and the proposed system uses an even-shift orthogonal sequence as a spreading code. The following performance measures are analysed: the data transmission rate, the block error rate when the receiver detects the preamble signal correctly, the synchronisation performance (the probability of detecting a preamble signal and the probability of false alarm), the block error taking account of the synchronisation performances, and the efficiency. The data transmission rate of the proposed system is much higher than that of the conventional spread spectrum pulse position modulation (SS-PPM) system. The block error rate considering the synchronisation performance can reach the lower bound by making use of the preamble signal [-1, -1, -1, +1, 0]. The efficiency of the proposed system is about 1.5 times greater than that of the SS-PPM system. This shows the effectiveness of the proposed system for improving the performance of the conventional SS-PPM system., IEE-INST ELEC ENG
IEE Proceedings Communications, Apr. 2004,
[Reviewed] M系列を用いたCSK ALOHA方式の性能解析Tsuyoshi Arai; Hiromasa Habuchi; Fumie Ono, 本論文では,M系列の周期自己相関のサイドローブが負になることに着目し,内部系列としてM系列を用いて構成される2重拡数系列を利用したCSK ALOHA方式のスループット特性が理論解析により示されている.また,直交系列を用いるCSK ALOHA方式やDS ALOHA方式との性能の比較が行われており,本方式の有効性が検討されている.その結果,外部系列に直交系列,内部系列にM系列を用いる2重拡数系列はCSK ALOHA方式に適していることが明らかにされている.また,2重拡数系列を用いたCSK ALOHA方式は従来の直交系列を用いるCSK ALOHA方式やDS ALOHA方式よりも優れたスループット特性を示すことが明らかにされている.更に,本方或は符号系列数を固定しても2重拡散系列の構成を変更することで符号系列長を変化させることが可能であることから,本方式を適用する通信路環境に応じて最良のスループットを達成する2重拡数系列を設定できる., The Institute of Electronics, Information and Communication Engineers
電子情報通信学会論文誌, Dec. 2003,
[Reviewed] A Comparison of the Spread Spectrum Modified Multipulse PPM System and the Spread Spectrum PPM System in a Multi-User Case
Fumie Ono; Hiromasa Habuchi
IEEE International Symposium on Intelligent Signal Processing and Communication Systems (ISPACS 2003), Dec. 2003, [Reviewed]
Throughput of the Unslotted CSK/SS ALOHA System with Nonorthogonal Sequences
Nobuyoshi Komuro; Hiromasa Habuchi
IEEE International Symposium on Intelligent Signal Processing and Communication Systems (ISPACS 2003), Dec. 2003, [Reviewed]
A New Modulation Technique Based on Pulse Position Modulation and Code Shift KeyingFumie Ono; Hiromasa Habuchi, A Time Hopping Pulse Spacing Modulation (TH-PSM) system, which combines the pulse position modulation system with code shift keying, is proposed. The following performances are analyzed; (1) data transmission rate, (2) error rate in a single-user case, (3) error rate in a mufti-user case, and (4) spectral efficiency. Consequently, the data transmission rate of the proposed system is higher than that of the conventional Spread Spectrum Pulse Position Modulation (SS-PPM) system. The proposed system can improve the probability of block error by increasing the number of information bits per spreading code. Moreover; the spectral efficiency of the proposed system is higher than that of the conventional system. The proposed system is more attractive than the conventional SS-PPM system for optical communications; power-line communications, and UWB communications., IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG
The Transactions of the Institute of Electronics, Information and Communication Engineers, Oct. 2003,
[Reviewed] Throughput of the CSK/SS ALOHA System with Nonorthogonal Sequences
Nobuyoshi Komuro; Hiromasa Habuchi
The 6th International Symposium on Wireless Personal Multimedia Communications (WPMC'03), Oct. 2003, [Reviewed]
A New Spread ALOHA System using Three-Valued Signaling
Tsuyoshi Arai; Hiromasa Habuchi
The 6th International Symposium on Wireless Personal Multimedia Communications (WPMC'03), Oct. 2003, [Reviewed]
M-ary/SSMA slotted ALOHA with traffic control scheme on erroneous feedback channelsTsuyoshi Arai; Hiromasa Habuchi, This paper discusses the influence of the erroneous feedback to the M-ary spread spectrum multiple access (M-ary/SSMA) ALOHA system with the traffic control. In particular, the throughput performance which takes into account the detection error of the transmission control signal for channel load sensing protocol (CLSP) and the automatic repeat request (ARQ) notifying signal is evaluated by theoretical analysis. As a result, it is shown that the detection error of the traffic control signal and the ARQ notifying signal causes seriously performance degradation., IEEE
IEEE Global Telecommunications Conference (GLOBECOM'02), Nov. 2002,
[Reviewed] Throughput analysis of nonorthogonal multilevel spread ALOHA systemsNobuyoshi Komuro; Hiromasa Habuchi; Masaru Kamada, In this paper, the nonorthogonal multilevel spread ALOHA system,, which combines the spread ALOHA system with the nonorthogonal multilevel system is investigated. In particular, the throughput performance of the nonorthogonal multilevel spread ALOHA system is evaluated by theoretical analysis. It is found that the throughput performance of the nonorthogonal multilevel spread ALOHA system is greater than that of the conventional spread ALOHA systems when the network traffic is not busy. It is found that application of the traffic control to the nonorthogonal multilevel spread ALOHA system is effective in improvement of the performance., IEEE
IEEE Global Telecommunications Conference (GLOBECOM'02), Nov. 2002,
[Reviewed] Performance of the time hopping modified PSM system on the AWGN channelFumie Ono; Hiromasa Habuchi, In this paper, a time hopping modified PSM system using pseudo-noise(PN) codes is proposed. The time hopping modified PSM system uses the several PN codes, and it transmits information by the interval between the successive PN codes. The bit error rate performance and the synchronization performance of the proposed system on the Additive White Gaussian Noise(AWGN) channel are evaluated by theoretical analysis. As a result, there is the optimum preamble pattern for bringing the probability of block error that takes into account the synchronization performance close to the lower bound. The efficiency of the time hopping modified PSM system is greater than that of the conventional SS-PPM system., IEEE
IEEE Global Telecommunications Conference (GLOBECOM'02), Nov. 2002,
[Reviewed] Proposal of a time-hopping pulse spacing modulation system with restricted amplitude levelsFumie Ono; Hiromasa Habuchi, In this paper, a time-hopping pulse spacing modulation system with restricted amplitude levels is proposed. The proposed system uses the several PN codes, and it transmits the information by the interval between the successive PN codes. The bit error rate performance and the synchronization performance of the proposed system on the Additive White Gaussian Noise(AWGN) channel are evaluated by theoretical analysis. As a result, there is the optimum preamble pattern for bringing the probability of block error that, takes into account the synchronization performance close to the lower bound., IEEE
International Symposium on Wireless Personal Multimedia Communications (WPMC2002, Oct. 2002,
[Reviewed] Initial acquisition performance of Bi-orthogonal modulation systems using differential detectorKouji Ohuchi; Kouichi Matsuno; Hiromasa Habuchi, In this paper, a frame synchronization system for bi-orthogonal modulation systems is treated. The bi-orthogonal modulation systems use several orthogonal sequences and their inverses for data transmission. Because of these several sequences, the bit error rate performance improves. However, the bi-orthogonal modulation system is more difficult to acquire frame timing than the systems such as the conventional Direct Sequence Spread Spectrum systems which use only one sequence for data transmission. A frame timing acquisition system analyzed in this paper is based on the method which uses a differential detector. By use of the differential detector the receiver obtains the frame timing information regardless of the transmitted sequence. In this paper the authors analyze the initial acquisition time which takes the probability of the false a arm into account, It is found that the rapid increase of the initial acquisition time can be reduced by increasing the number of verification and by raising the threshold level., IEEE
IEEE International Symposium on Spread Spectrum Techniques & Applications (ISSSTA 2002), Sep. 2002,
[Reviewed] M-ary/SSMA slotted ALOHA with traffic control scheme on erroneous feedback channelsT Arai; H Habuchi, This paper discusses the influence of the erroneous feedback to the Wary spread spectrum multiple access (Mary/SSMA) ALOHA system with the traffic control. In particulax, the throughput performance of the Mary/SSMA ALOHA system with channel load sensing protocol (CLSP) which takes into account the detection errors of the ARQ notifying signal and the transmission control signal for CLSP is evaluated by theoretical analysis. As a result, it is shown that the detection error of the traffic control signal and the ARQ notifying signal causes seriously performance degradation., IEEE
5TH INTERNATIONAL SYMPOSIUM ON WIRELESS PERSONAL MULTIMEDIA COMMUNICATIONS, VOLS 1-3, PROCEEDINGS, 2002,
[Reviewed] Bi-orthogonal modulation systems using two different inner sequencesOhuchi Kouji; Hiromasa Habuchi, In this paper, we describe a frame synchronization method for bi-orthogonal modulation systems. In biorthogonal modulation systems, several bi-orthogonal sequences are used for data transmission, Frame synchronization in biorthogonal modulation systems is difficult because transmitted sequences call change every frame, In the proposed method, each bi-orthogonal sequence consists of two different inner sequences, Each bi-orthogonal sequence has the same arrangement of two different inner sequences. A receiver can track the frame timing by observing the arrangement of inner sequences. In this paper, we analyze the hit error rate performance that takes into account the tracking performance of a system we developed based oil our method. The spectral efficiency of the proposed system ill code division multiple access (CDMA) systems is also investigated. As a result. we found that the proposed system is effective in synchronous CDMA systems., IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG
The Transactions of the Institute of Electronics, Information and Communication Engineers, Dec. 2001,
[Reviewed] The delay property of the M-ary/SSMA ALOHA systems with the traffic control protocol
Tsuyoshi Arai; Hiromasa Habuchi
International Conference on Information Communications and Signal Processing(ICICS'01), Oct. 2001, [Reviewed]
Theoretical analysis of the unslotted SS-CSC/CDMA ALOHA system
Nobuyoshi Komuro; Hiromasa Habuchi
International Conference on Information Communications and Signal Processing (ICICS'01), Oct. 2001, [Reviewed]
Theoretical Analysis of the Spread Spectrum PSM System using E-sequences and a PreambleFumie Ono; Hiromasa Habuchi, In this paper, the Spread Spectrum Pulse Spacing Modulation (SS-PSM) system using E-sequences and a preamble is considered. The preamble signal is used for block synchronization. The following performances are evaluated by theoretical analysis; 1) the data transmission rate; 2) the block error rate when the receiver detects the preamble correctly; 3) the synchronization performances (the probability of detection and the probability of false alarm); 4) the block error rate considering the synchronization performances; 5) the efficiency. Consequently, the data transmission rate of the SS-PSM system is much higher than that of the conventional Spread-Spectrum Pulse Position Modulation (SS-PPM) system. The block error rate considering the synchronization performance can reach the lower bound by making use of the preamble. The efficiency of the SS-PSM system is 2 times greater than that of the conventional SS-PPM system., IEEE
IEEE International Conference on Communications (ICC 2001), Jun. 2001,
[Reviewed] A Spread Spectrum PSM System using a Preamble
Fumie Ono; Hiromasa Habuchi
International Symposium of Information Theory and Its Applications, Nov. 2000, [Reviewed]
Throughput Analysis of Packet Radio Network using the SS-CSC/SSMA Scheme
Nobuyoshi Komuro; Hiromasa Habuchi
International Symposium of Information Theory and Its Applications, Nov. 2000, [Reviewed]
Performance Analysis of Spread ALOHA Systems with ARQ Protocol
Hiromasa Habuchi; Tatsuya Matsumoto; Tsuyoshi Arai
IEEE 7th Singapore International Conference on Communication Systems, Nov. 2000, [Reviewed]
Analysis of the Bi-orthogonal Modulation System using Two Different Inner SequencesKouji Ohuchi; Hiromasa Habuchi, In this paper, a frame synchronization method for the bi-orthogonal modulation system is proposed. The hi-orthogonal modulation system is one of attractive systems because the Bit Error Rate (BER) performance improves as the number of sequences, which is employed in the system, increases under an additive white gaussian noise environment. Frame synchronization of the bi-orthogonal modulation system is difficult, however, because the bi-orthogonal modulation system uses several sequences for data transmission. In this paper, we show a frame synchronization system that utilizes two different inner sequences. This system enables the receiver to extract the frame timing from the received signal by using the conventional delay lock loop in total independence from the transmitted sequence. In this paper, we analyze the tracking performance of the proposed frame synchronization system. Moreover, the BER performance considering the tracking performance is investigated. As the result, it is found that there is a trade-off between the BER performance and the tracking performance. Furthermore, it is shown that the BER performance of the proposed system is better than that of Binary Phase Shift Keying by 1 [dB] at 10(-5) BER., IEEE
IEEE 6th International Symposium on Spread Spectrum Techniques and Applications, Sep. 2000,
[Reviewed] Performance Evaluation of the M-ary/SSMA ALOHA System with CLSPTsuyoshi Arai; Hiromasa Habuchi, The M-ary Spread Spectrum Multiple Access (M-ary/SSMA) ALOHA system applying Channel Load Sensing Protocol (CLSP) as the traffic control is evaluated by theoretical analysis. In particular, the throughput performance and the delay property of the M-ary/SSMA slotted ALOHA system with CLSP under Additive White Gaussian Noise are analyzed. Moreover, the M-ary/SSMA slotted ALOHA system with CLSP is compared with the conventional Direct Sequence Spread Spectrum Multiple Access (DS/SSMA) slotted ALOHA system with CLSP. As a result, it is shown that the CLSP takes effect to improve the performances of the M-ary/SSMA slotted ALOHA system. The M-ary/SSMA slotted ALOHA system with CLSP is superior to the conventional DS/SSMA slotted ALOHA system with CLSP., IEEE
IEEE 6th International Symposium on Spread Spectrum Techniques and Applications, Sep. 2000,
[Reviewed] Performance Analysis of the SS-PSM System using E-sequences and a PreambleFumie Ono; Hiromasa Habuchi, In this paper, the Spread Spectrum Pulse Spacing Modulation (SS-PSM) system using even-shift orthogonal sequences (E-sequences) and a preamble is considered. The probability of block error that takes into account the synchronization performance is evaluated by theoretical analysis. In particular, the effects of the probability of detection of a preamble and the probability of false alarm on the probability of block error are discussed. Consequently, it is found that the probability of detection and the probability of false alarm depend on the pattern of preamble. The probability of block error considering the synchronization performance can reach the lower bound by making use of the preamble with good correlation function., IEEE
IEEE 11th International Symposium on Personal, Indoor and Mobile Radio Communications, Sep. 2000,
[Reviewed] Proposal of a Spread ALOHA System using the SS-CSC TechniqueNobuyoshi Komuro; Hiromasa Habuchi, In this paper, a spread ALOHA system using the spread-spectrum communication system with constrained spreading codes (SS-CSC/SSMA ALOHA system) is proposed. The throughput performance and the delay property of the proposed system are investigated. Moreover, the proposed system is compared with the Direct Sequence Spread Spectrum Multiple Access (DS/SSMA) ALOHA system and the M-ary Spread Spectrum Multiple Access (M-ary/SSMA) ALOHA system. Consequently, it is found that the maximum throughput of the proposed system is greater than those of the DS/SSMA ALOHA system and the M-ary/SSMA ALOHA system. It is also found that the delay property of the proposed system is also better than those of the DS/SSMA ALOHA system and the M-ary/SSMA ALOHA system. Furthermore, it is shown that the performance of the proposed system is improved by increasing E-b/N-0 and the length of spreading code., IEEE
IEEE 11th International Symposium on Personal, Indoor and Mobile Radio Communications, Sep. 2000,
[Reviewed] A Comparison of the M-ary/SSMA ALOHA System and the DS/SSMA ALOHA SystemTsuyoshi Arai; Hiromasa Habuchi, A comparison of the M-ary Spread Spectrum Multiple Access (M-ary/SSMA) ALOHA system and the Direct Sequence Spread Spectrum Multiple Access (DS/SSMA) slotted ALOHA system is evaluated when using tha Channel Load Sensing Protocol (CLSP) as the traffic control. In particular, the throughput performance and the delay property of the both systems under Additive White Gaussian Noise and Rayleigh fading are derived. As a result, it is shown that the CLSP takes effect to improve the system performance of the M-ary/SSMA slotted ALOHA system and the DS/SSMA slotted ALOHA system under Rayleigh Fading channel. The performance improvement of the M-ary/SSMA ALOHA system by using CLSP is larger than that of the DS/SSMA ALOHA system. The M-ary/SSMA slotted ALOHA system with CLSP is superior to the DS/SSMA slotted ALOHA system with CLSP., IEEE
IEEE 11th International Symposium on Personal, Indoor and Mobile Radio Communications, Sep. 2000,
[Reviewed] A Comparison of the M-ary/SSMA ALOHA System and the DS/SSMA ALOHA System under the Frequency Selective Fading Channel
Tsuyoshi Arai; Hiromasa Habuchi
IEEE 7th Singapore International Conference on Communication Systems, Sep. 2000, [Reviewed]
A Novel Synchronization Method for Bi-orthogonal Modulation SystemsHiromasa Habuchi; Yasuo Usui, In this paper, a bi-orthogonal modulation system using a Delay Lock Loop and a differential detector is proposed. Moreover, the bit error rate(BER) performance under complete synchronization, the synchronization performance, and the BER performance by taking account of the tracking error are evaluated by theoretical analysis. The proposed system uses concatenated sequences which consist of the two separate sequences, that is, an anterior sequence and a posterior sequence, as the spreading codes. Because the particular sequence always appears by multiplying the anterior sequence by the posterior sequence, the proposed system can extract the timing information from the received signal itself. Consequently, the BER performance of the proposed system is the same as the lower bound of the bi-orthogonal modulation system. It is found that the proposed system is superior to the conventional bi-orthogonal modulation system using the particular synchronizing code., IEEE
IEEE 11th International Symposium on Personal, Indoor and Mobile Radio Communications, 2000,
[Reviewed] A Study on Spectral Efficiency of Code Shift Keying using Two Different Inner Sequences
Kouji Ohuchi; Hiromasa Habuchi
International Symposium of Information Theory and Its Applications, 2000, [Reviewed]
Performance Evaluation of the M-ary/SSMA Unslotted ALOHA System
Tsuyoshi Arai; Hiromasa Habuchi
International Technical Conference on Circuits/Systems, Computers and Communications, 1999, [Reviewed]
Frame Synchronization Method with the Differential Detector for CSK Utilizing the M-sequence Property
Kouji Ohuchi; Hiromasa Habuchi; Hidekazu Fujiwara
International Technical Conference on Circuits/Systems, Computers and Communications, 1999, [Reviewed]
Spectral Efficiency of the Orthogonal Multicarrier M-ary/SS System over Frequency Selective Fading Channel
Tsuyoshi Arai; Hiromasa Habuchi
International Technical Conference on Circuits/Systems, Computers and Communications, 1999, [Reviewed]
Performance in the SSMA Unslotted ALOHA System with the M-ary/SS Technique
Tsuyoshi Arai; Hiromasa Habuchi
International Conference on Information, Communications and Signal Processing, 1999, [Reviewed]
A Theoretical Analysis of the Synchronous SS-CSC/CDMA SystemKouji Ohuchi; Hiromasa Habuchi; Toshio Takebayashi, In this paper, the bit error rate (BER) performance of the Spread Spectrum communication with Constrained Spreading Code system is studied under the synchronous CDMA system. Particularly, BER considering the tracking error is derived by theoretical analysis. The synchronizing spreading sequence is employed to track the signals in the receiver. As the result, the BER performance is degraded by increasing the number of users. However, the BER performance can be improved by canceling the co-channel interference and by suppressing the cross-correlation Value between the information spreading sequence and the synchronizing spreading sequence., IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG
The Transactions of the Institute of Electronics, Information and Communication Engineers, Nov. 1998,
[Reviewed] Performance Comparison of M-ary/SSMA Systems and DS/SSMA Systems in the Presence of Frequency Selective Fading and Partial-Band InterferenceTuyoshi Arai; Hiromasa Habuchi, M-ary/SS systems are compared with DS/SS systems applied the multicarrier systems and the RAKE receiver in the presence of AWGN, frequency selective Rayleigh fading and partial-band interference. In particular; the BER performance and SSMA capability are evaluated. Consequently, the M-ary/SSMA system using the multicarrier techniques is subject to the M-ary/SSMA system with the RAKE receiver in the presence of partial-band interference. The BER performance of the M-ary/SSMA system is better than that of the DS/SSMA system when the number of users is smaller than 20. And the spectral efficiency of the multicarrier M-ary/SSMA system is best in the four systems when JSR = 20 [dB] and BER = 10(-3)., IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG
The Transactions of the Institute of Electronics, Information and Communication Engineers, Nov. 1998,
[Reviewed] Effects of CCI Cancellation Techniques on the Synchronous SS-CSC/CDMA System
Kouji Ohuchi; Hiromasa Habuchi; Toshio Takebayashi
IEEE International Workshop on Intelligent Processing and Communication System (ISPACS'98), Nov. 1998, [Reviewed]
Spectral Effeciency of the Multicarrier M-ary/SSMA Systems
Tsuyoshi Arai; Hiromasa Habuchi
IEEE International Workshop on Intelligent Signal Processing and Communication Systems(ISPACS'98), Nov. 1998, [Reviewed]
Performance Analysis of Orthogonal Multicarrier M-ary/SSMA SystemsTsuyoshi Arai; Hiromasa Habuchi, The performance of orthogonal multicarrier M-ary spread spectrum multiple access (M-ary/SSMA) systems are analyzed under frequency selective fading and partial-band interference. Orthogonal multicarrier M-ary/SSMA systems are the M-ary spread spectrum (M-ary/SS) systems utilizing orthogonal multicarrier transmission scheme. In this paper, the bit error rate (BER) performance, the effect of time diversity techniques and the influence of partial-band interferences was investigated. As a result, the BER performance of the orthogonal multicarrier M-ary/SSMA system is superior to the conventional multicarrier M-ary/SSMA system without time diversity scheme. And the time diversity scheme improves BER performance against partial-band interference., IEEE
IEEE Global Telecommunication Conference(GLOBECOM'98), Nov. 1998,
[Reviewed] Throughput Performance of M-ary/SSMA Slotted ALOHA SystemsTsuyoshi Arai; Hiromasa Habuchi, An M-ary/Spread Spectrum Multiple Access (M-ary/ SSMA) system can achieve higher data transmission rate and can improve bit error rate under additive white Gaussian noise (AWGN). In this paper, the M-ary/SSMA slotted ALOHA system, which combines the spread ALOHA system with the M-ary/SSMA system, is discussed. In particular. the throughput performance in the presence of AWGN and Rayleigh fading is analyzed. Moreover, the M-ary/SSMA slotted ALOHA systems are compared with the conventional Direct-Sequence/Spread Spectrum Multiple Access (DS/SSMA) slotted ALOHA systems. Consequently: it is found that the maximum throughput of the M-ary/SSMA slotted ALOHA system is higher than that of the conventional DS/SSMA slotted ALOHA system., IEEE
IEEE Global Telecommunications Conference(GLOBECOM'98), Nov. 1998,
[Reviewed] A Self-Synchronization Method for the SS-CSC SystemHiromasa Habuchi; Toshio Takebayashi; Takaaki Hasegawa, In this paper, a simple flame synchronization method for the SS-CSC system is proposed, and the synchronization performance is analyzed. There have been growing interests in the M-ary/SS communication system and the bi-orthogonal modulation system because these systems can achieve the high frequency utilization efficiency. However, the frame synchronization is difficult. We proposed the SS-CSC system, and evaluated the bit error tate (BER) performance of the SS-CSC system under the completed synchronization. The BER performance of the SS-CSC system is much the same as that of the bi-orthogonal modulation system. In this paper, a frame synchronization method using the differential detector and racing counters is proposed. In particular, the lose lock time, the recovery rime and the BER performance considering the synchronizing performance are analyzed. In consequence, the BER performance considering the synchronization performance can approach the lower bound of the SS-CSC system by tuning the number of the stages in racing counters., IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG
The Transactions of the Institute of Electronics, Information and Communications Engineers, 1997,
[Reviewed] An Analysis of Frame Synchronization Systems with Racing Counters and Majority Rule for M-ary/SS Communication SystemsKouji Ohuchi; Hiromasa Habuchi, In this paper, a simple frame synchronization system for M-ary Spread Spectrum (M-ary/SS) communication systems is analyzed, In particular, synchronization performance, bit error rate performance, and Spread Spectrum Multiple Access (SSMA) performance are analyzed. The frame synchronization system uses the racing counters. The transmitted signal contains framing chips that are added to spreading sequences. In the receiver, the framing chips are detected from several frames. The authors have proposed the simple Frame synchronization system that detects framing chips from consecutive 2 frames. In this system, as the number of framing chips increases, synchronization performance improves and bit error rate performance degrades. In this paper a frame synchronization system that improves bit error rate performance is treated and analyzed. As the result, when the number of reference frames is 3, the bit error rate is much improved than the conventional system., IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG
The Transactions of the Institute of Electronics, Information and Communications Engineers, 1997,
[Reviewed] SSMA Performance of Multicarrier M-ary/SS Systems over Frequency Selective Fading Channel
Hiromasa Habuchi; Tsuyoshi Arai
International Technical Conference on Circuits/Systems, Computers and Communications, 1997, [Reviewed]
A Synchronization System with Differential Detector for the SS-CSC SystemHiromasa Habuchi; Toshio Takebayashi; Takaaki Hasegawa, In this paper, a frame synchronization method using the differential detector and racing counters is proposed. Moreover, the synchronization performance of the proposed system is discussed. In particular, the lose lock time, the recovery time and the BER performance considering the synchronizing performance are analyzed. In consequence, the BER performance considering the synchronization performance can approach the lower bound of the SS-CSC system by tuning the number of the stages in the racing counters., I E E E
The 8th International Symposium on Personal, Indoor and Mobile Radio Communications, 1997,
[Reviewed] Synchronous CDMA Performance of Bi-orthogonal Systems with Synchroninzing PN SequenceHiromasa Habuchi; Takahiro Hasegawa, The aim of this paper is to evaluate the code division multiple access capability considering synchronization performance on bi-orthogonal modulation systems. In particular, the tracking performance, the bit error rate (BER) considering tracking performance, and the effect of co-channel interference cancelling techniques are evaluated by theoretical analysis. Consequently, it is found that the optimum ratio of information signal energy to the synchronizing energy varies with E-b/N-0. The co-channel interference canceller is better for small K than for large K (K = the number of users). Moreover, it is found that the BER performance considering synchronization performance improves as the equivalent noise bandwidth B-n decreases., IEEE
1st International Conference on Information Communications and Signal Processing, 1997,
[Reviewed] Theoretical Analysis M-ary/SSMA Systems Multicarrier TechniquesTsuyoshi Arai; Hiroamsa Habuchi, In this paper, M-ary spread spectrum multiple access (M-ary/SSMA) communication systems utilizing multicarrier techniques are evaluated by theoretical analysis. The M-ary/SS system using the multicarrier technique (multicarrier M-ary/SS system) has many advantages as some characteristics with the spread spectrum system. In this paper, multiple access capability of the multicarrier M-ary/SS system is evaluated by theoretical analysis in the presence of frequency selective fading and partial band interference. Moreover, the multicarrier M-ary/SS system is compared with the multicarrier direct-sequence spread-spectrum (multicarrier DS/SS) system. As a result, the BER of the multicarrier M-ary/SSMA system is better than that of the multicarrier DS/SSMA system when the number of users is small and E-b/N-0 is low. And the BER. of the multicarrier M-ary/SSMA system can he improved with increasing the number of carriers. Moreover the multicarrier M-ary/SSMA system is superior to the single carrier M-ary/SSMA system using RAKE receiver in the presence of the narrowband interference., IEEE
1st International Conference on Information Communications and Signal Processing, 1997,
[Reviewed] Performance of the DPPM/CDM System using a Cascaded Cancellation SchemeHiromasa Habuchi; Mariko Masubuchi, In this paper, the code division multiplex of the digital pulse position modulation system (DPPM/CDM system) using the cascaded cancellation scheme is proposed. Moreover, the bit error rate (BER) performance and the effect of the cascaded cancellation techniques are evaluated. As a result, it is found that the BER performance is more close to lower bound when the number of stages in the cascaded cancellation system increases. Therefore, the cascaded cancellation technique is effective to suppress the co-channel interferences. It is noticed that the degradation from lower bound is less than 0.1[dB] when the number of stages in the cascaded cancellation system is 2. Therefore, the number of cancellers is 2 for simplicity ., IEEE
1st International Conference on Information Communications and Signal Processing, 1997,
[Reviewed] Bit error rate of bi-orthogonal systems considering synchronization performance
Hiromasa Habuchi; Shun Hosaka, In this paper, the bit error rate (BER) considering tracking performance is evaluated, by theoretical analysis and computer simulation, for a bi-orthogonal system using a synchronizing pseudo-noise (PN) sequence and co-channel interference cancellers. A system that improves on Tachikawa's system is proposed. It is found that the optimum ratio of the information signal energy to the synchronizing signal energy varies with Eb/N0, and the canceller is better for small L than for large L (L = length of the sequence). Moreover, it is found that the BER considering synchronization performance improves as the equivalent noise bandwidth Bn decreases., Institute of Electronics, Information and Communication, Engineers, IEICE
IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences, 1996
Theoretical Analysis of M-ary/SS Communication Systems using Racing Counters and a Hadamard MatrixKouji Ohuchi; Hiromasa Habuchi; Takaaki Hasegawa, In this paper, performance of M-ary spread spectrum (M-ary/SS) communication systems is discussed. Firstly, the initial acquisition time is evaluated. Secondly, retention time, which is the average number of frames holding correct frame timing, and recovery time, which is the average number of frames required to establish synchronization, are derived. Lastly, bit-error rate (BER) performance is evaluated. M-ary/SS communication systems, which have more than one spreading code, can improve BER performance under conditions in which there is additive white Gaussian noise (AWGN). However, the synchronization of M-ary/SS communication systems is difficult because they have several spreading codes. The frame synchronization method which is used in this paper uses a Hadamard matrix and ''racing counters.'' As a result, the retention time becomes longer than the recovery time when the size of the lower counter differs greatly from that of the upper counter in the racing counters. Then BER gets close to the performance which is achieved under the complete synchronization., IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
IEEE Journal on Selected Areas in Communications, 1996,
[Reviewed] Bit Error Rate of Bi-orthogonal Systems Considering Synchronization PerformanceHiromasa Habuchi; Shun Hosaka, In this paper, the bit error rate (BER) considering tracking performance is evaluated, by theoretical analysis and computer simulation, for a bi-orthogonal system using a synchronizing pseudo-noise (PN) sequence and cochannel interference cancellers. A system that improves on Tachikawa's system is proposed. It is found that the optimum ratio of the information signal energy to the synchronizing signal energy varies with E(b)/N-0, and the canceller is better for small L than for large L (L = length of the sequence). Moreover, it is Found that the BER considering synchronization performance improves as the equivalent noise bandwidth B-n decreases., IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG
The Transactions of the Institute of Electronics, Information and Communications Engineers, 1996,
[Reviewed] Synchronization Methods using Several Synchronizing Chips for M-ary/SS Communication SystemsKouji Ohuchi; Hiromasa Habuchi, In this paper, a simple frame synchronization system for M-ary/SS communication systems is proposed, and synchronization performance and the resulting bit error rate performance are analyzed. The frame synchronization system uses racing counters and framing chips which are added to spreading sequences. M-ary/SS communication systems can improve bit error rate performance under the condition in which there is an additive white gaussian noise. Synchronization of M-ary/SS communication systems is difficult, however, because M-ary/SS communication systems hew several spreading sequences. The authors proposed the simple frame synchronization system which uses only one chip in the spreading sequence as a framing signal. This system needs a long time for initial acquisition as the frame length is longer. The proposed system in this paper can make initial acquisition time short by increasing the number of framing chips. The proposed system corresponds to the conventional system when the number of framing chips is 1. As the result, it is shown that several framing chips contribute to decrease the initial acquisition time. Moreover, the frame synchronization system can be applied to asynchronous M-ary/SSMA system when different framing chip pattern is assigned to each user., IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG
Teh Transactions of the Institute of Electronics, Information and Communications Engineers, 1996,
[Reviewed] Analysis of BER Performance of the Spread Spectrum Communication System with Constrained Spreading CodeHiromasa Habuchi; Toshio Takebayashi; Takaaki Hasegawa, In this paper, the bit error rate (BER) performance of the Spread Spectrum communication system with Constrained Spreading Codes (SS-CSC) is analyzed. The EER of the SS-CSC system is the same as that of the Bi-orthogonal system. Moreover, the frequency utilization efficiency of the SS-CSC system is better than that of the Bi-orthogonal system when K less than or equal to 10 and n = 3., IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG
The Transactions of the Institute of Electronics, Information and Communications Engineers, 1996,
[Reviewed] Initial Acquistion Time of M-ary/SS Communication System with Several Synchronizing ChipsKouji Ohuchi; Hiromasa Habuchi, M-ary/SS communication systems can improve bit error rate performance under the condition that in which there is an additive white gaussian noise. Synchronization Of M-ary/SS communication systems gets difficult, however, because M-ary/SS communication systems have several spreading sequences. The authors proposed the simple frame synchronization system which uses one chip in the spreading sequence as framing signal. This system needs a long time for initial acquisition. In this paper, a frame synchronization system which makes initial acquisition time short is proposed. In this system, the number of framing chips (r) is greater than 1. The proposed system corresponds to the conventional system when r = 1. As the result, when 10 framing chips are added to 31 chip spreading sequence under 10(-4) bit error rate, initial acquisition time of proposed system is 88 % shorter than that of 1 chip added., I E E E
IEEE International Symposium on Spread Spectrum Techniques and Applications, 1996,
[Reviewed] Performance Analysis of the SS-CSC System using Synchronizing Spreading CodeToshio Takebayashi; Hiromasa Habuchi; Takaaki Hasegawa, In this paper, the performance of the Spread Spectrum communication Constrained Spreading Code (SS-CSC) system using synchronizing spreading code is discussed. In particular, the bit error rate (BER) and the initial acquisition time are evaluated by theoretical analysis. Moreover, the performance of this system is compared with that of Hi-orthogonal system. Consequently, it is found that the average acquisition time increases and tile BER decreases when increasing E(info)/E(sync). Moreover, the SS-CSC system with the canceller is superior about 5.5[dB] to the system without the canceller when the BER is 10(-6) and E(info)/E(sync) is 0.5. The SS-CSC system using a synchronizing spreading code had better use the canceller in order to reduce E(info)/E(sync). The BER of the SS-CSC system using synchronizing code is the same as that of the Hi-orthogonal system., I E E E
IEEE International Symposium on Spread Spectrum Techniques and Applications, 1996,
[Reviewed] The Synchronization Performance of the SS-CSC system using Synchronizing preading CodeToshio Takebayashi; Hiromasa Habuchi, In this paper, the performance of the Spread Spectrum communication Constrained Spreading Code (SS-CSC) system using synchronizing spreading code is discussed. In particular, the bit error rate (BER) and the initial acquisition time are evaluated by theoretical analysis. Moreover, the performance of this system is compared with that of Hi-orthogonal system. Consequently, it is found that the average acquisition time increases and tile BER decreases when increasing E(info)/E(sync). Moreover, the SS-CSC system with the canceller is superior about 5.5[dB] to the system without the canceller when the BER is 10(-6) and E(info)/E(sync) is 0.5. The SS-CSC system using a synchronizing spreading code had better use the canceller in order to reduce E(info)/E(sync). The BER of the SS-CSC system using synchronizing code is the same as that of the Hi-orthogonal system., I E E E
IEEE International Conference on Communication Systems and IEEE International Workshop on Intelligent Signal Processing and Communication Systems, 1996,
[Reviewed] Bit Error Rate Performance of Bi-orthogonal System with Synchronizing Signal
Shun Hosaka; Hiromasa Habuchi
IEEE International Conference on Communication Systems and IEEE International Workshop on Interlligent Signal Processing and Communication Systems, 1996, [Reviewed]
Performance Evaluation of the SS-CSC System
Hiromasa Habuchi; Takaaki Hasegawa
1995 International Symposium on Communications, ISCOM'95, 1995, [Reviewed]
Bit Error Rate Performance of M-ary/SS Communication Systems using Racing Counter
Kouji Ohuchi; Hiromasa Habuchi; Takaaki Hasegawa
1995 International Symposium on Communications, ISCOM'95, 1995, [Reviewed]
Proposal of Spread Spectrum Communication Constrained Spreading Code羽渕裕真; 長谷川孝明, Copyright notice. c1994 IEICE All rights reserved. 「拡散符号を拘束したスペクトル拡散通信方式の提案」 羽渕裕真, 長谷川孝明著, 電子情報通信学会論文誌 B, 1994 Vol.J77-B1 No.12 pp. 749-751 許諾No.07RB0055.本論文では,複数の拡散符号から選択した符号を一定区間利用するスペクトル拡散通信方式を提案している.本方式は従来のM-aryスペクトル拡散通信方式と同様に誤り率特性を改善することができ,更に従来方式に比べ装置を簡易にできる., The Institute of Electronics, Information and Communication Engineers
The transactions of The Institute of Electronics, Information and Communication Engineers., 1994,
[Reviewed] A Study on the M-ary/SS Communication System using a Frame Synchronization Method of PCM Communication SystemsKouji Ohuchi; Hiromasa Habuchi; Takaaki Hasegawa, Synchronization has been one of the problems in M-ary spread spectrum communication systems. In this letter, we propose the frame synchronization method using the Hadamard matrix and a frame synchronization method of PCM communication systems. Moreover, we analyze the probabilities of keeping synchronous state and frame renewal rates, and we evaluate the relationship between these probabilities and the number of stages of counters., IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG
The transactions of The Institute of Electronics, Information and Communication Engineers, 1994,
[Reviewed] M-ary/SS Communication System using a Frame Synchronization Method of PCM Systems
Kouji Ohuchi; Hiromasa Habuchi; Takaaki Hasegawa
International Symposium on Information Theory and Its Applications, 1994, [Reviewed]
Influence of Phase Difference between the Groups on BER Performance in the 2M-plex SystemHiromasa Habuchi; Takaaki Hasegawa, Recently, there has been increasing interest in Code Division Multiplex (CDM) systems. We reported the CDM system using the DELTA-chip shift multiplex operation. So far the performance of this system evaluated under the optimum DELTA. In this letter, we evaluate an influence of the phase difference between the groups on BER performance in 2M-plex system., IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG
The Transactions of The Institute of Electronics, Information and Communication Engineers, Jul. 1993,
[Reviewed] An Auto-Correlation Side-Lobe Suppression Method of Independence from Chip-Waveform on Modified M-Sequence and Its Application羽渕裕真; 長谷川孝明; 鈴木康夫, Copyright notice. c1991 IEICE All rights reserved. 「チップ波形によらない変形M系列の自己相関関数のサイドロープ抑圧法とその応用」羽渕裕真,長谷川孝明,鈴木康夫著, 電子情報通信学会論文誌 A ,1991 Vol.J74-A No.12 pp. 1808-1809 許諾No.07RB0055.変形M系列の自己相関関数のサイドローブをチップ波形によらずOにする方法を示し，それによって得られた系列を符号分割多重化法の一つであるa-chipシフト多重化法に適用し,その性能評価を行っている., 電子情報通信学会
The Transactions of The Institute of Electronics, Information and Communication Engineers, Dec. 1991,
[Reviewed] A Code Division Multiplex using Manchester Coded Orthogonal SequencesHiromasa Habuchi; Takaaki Hasegawa; Yukio Hakura; Misao Haneishi, There has been increasing interest recently in code division multiplex (CDM) systems. The authors reported a CDM system using pseudo‐orthogonal Manchester‐coded M‐sequence pairs. For this CDM system, the effective energy per bit in the received signals is reduced (M + 1)/2M times as much as the transmitted energy per bit. Moreover, the bit error rate (BER) of the 3M‐plex system, which uses the “a‐chip‐shift” multiplex operation alone, does not converge on zero even if Eb/N0 increases. This paper proposes a CDM system using Manchester‐coded orthogonal sequences which consists of an M‐sequence M chip and an additional chip. The proposed 3M‐plex system is a combination of the “a‐chip‐shift” multiplex operation and the amplitude multiplex operation. The proposed systems do not have loss of the effective received signal energy. The BER of the proposed systems converges to zero with increasing Eb/N0. Moreover, the proposed system out performs the Manchester‐coded multilevel transmission system. Copyright © 1992 Wiley Periodicals, Inc., A Wiley Company
The Transactions of The Institute of Electronics, Information and Communication Engineers, May 1991,
[Reviewed] A Code Division Multiplex using Pseudo Orthogonal Manchester Coded M-Sequence Pairs羽渕裕真; 長谷川孝明; 羽倉幸雄; 羽石操, Copyright notice. c1990 IEICE All rights reserved. 「擬直交マンチェスタ符号化Ｍ系列対による符号分割多重化法」羽渕裕真,長谷川孝明,羽倉幸雄,羽石操著, 電子情報通信学会論文誌 B ,1990 Vol.J73-B1No.4 pp. 371-377 許諾No.07RB0055.あらましスペクトル拡散通信は符号分割多重による多元接続が可能な方式として注目されているが,拡散符号間に相互相関が存在するため,同時通信を行う各チャネル間にチャネル間干渉が存在し,チャネル数が多い場合にはこのチャネル間干渉は無視できないものとなる.この問題の解決法として擬直交M系列対の利用が提案されている.この系列対は拡散符号と逆拡散符号が異なり,相互相関のサイドローブが0であることによりチャネル間干渉を0にしている.本論文では擬直交M系列対をマンチェスタ符号化した擬直交マンチェスタ符号化M系列対を用いた同期式スペクトル拡散多重通信方式を提案する.本方式は擬直交マンチェスタ符号化M系列対を1chipずつシフトしたM種類の系列を各チャネルの拡散符号に割り当て,このMチャネルを一つの系列群とし,その系列群の初期位相を異ならせながら数を増やすためチャネル間干渉を低く抑えることができ,チャネル数をM×2,Mx3にすることができる.また,系列群数を1とした場合は,チャネル間干渉なしでMチャネルの多重伝送が可能である.更に受信側にキャンセラを用いることにより本システムの性能を向上させることができる., 電子情報通信学会
The Transactions of The Institute of Electronics, Information and Communication Engineers, Apr. 1990,
[Reviewed] A Synchronous Code Division Multiplex using Raised-Cosine Orthogonal Sequences
Hiromasa Habuchi; Takaaki Hasegawa; Yukio Hakura; Misao Haneishi
International Symposium on Information Theory and Its Applications, 1990, [Reviewed]
A Novel Multiplex for Optical PPM ChannelHABUCHI Hiromasa, Copyright notice. c1988 IEICE All rights reserved. 「光通信ＰＰＭの新しい多重化法」羽渕裕真,長谷川孝明,羽倉幸雄,羽石操著, 電子情報通信学会論文誌 B, 1988 Vol. J71-B No.1 pp. 92-93 許諾No.07RB0055.光通信PPM(Pulse Position Modula-tion)の新しい多重化法を提案し,特に,2重化法について述べ,ショット雑音が支配的な場合の誤り率の計算を行う., 電子情報通信学会
The Transactions of The Institute of Electronics, Information and Communication Engineers, 1988
A Novel Multiplex Operation for Optical PPM ChannelsHiromasa Habuchi; Takaaki Hasegawa; Yukio Hakura; Misao Haneishi, Copyright notice. c1988 IEICE All rights reserved. 「光通信ＰＰＭの新しい多重化法」羽渕裕真,長谷川孝明,羽倉幸雄,羽石操著, 電子情報通信学会論文誌 B, 1988 Vol. J71-B No.1 pp. 92-93 許諾No.07RB0055.光通信PPM(Pulse Position Modula-tion)の新しい多重化法を提案し,特に,2重化法について述べ,ショット雑音が支配的な場合の誤り率の計算を行う., 電子情報通信学会
International Conference on Communication Systems, 1988,
[Reviewed] A Novel Amplitude Division Multiplex for Digital Pulse Position Modulation長谷川孝明; 羽渕裕真; 羽倉幸雄; 羽石操, Copyright notice. c1987 IEICE All rights reserved. 「振幅分割によるディジタルパルス位置変調の新しい多重化法」長谷川孝明, 羽渕裕真,羽倉幸雄,羽石操著, 電子情報通信学会論文誌 B, 1990. Vol. J73-B No.4 pp. 371-377 許諾No.07RB0055.DPPM(Digital Pulse-Position Modula・tion)の新しい多重化法を提案した., 電子情報通信学会
The Transactions of The Institute of Electronics, Information and Communication Engineers, Oct. 1987,
[Reviewed]
