研究者詳細 - 山里　敬也

論文 - 山里　敬也

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セルラー環境でのCDMA ALOHA方式のスループット解析

山里敬也,浅井裕介, ジャマリプールアバス, 片山正昭, 小川明

第19回情報理論とその応用シンポジウム SITA96 巻 ( D-4-2 ) 頁： 313-316 1996年12月

CDMA ALOHA systems with modified channel load sensing protocol for satellite communications 査読有り

Okada H, Saito M, Sato T, Yamazato T, Katayama M, Ogawa A

IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES E79A 巻 ( 12 ) 頁： 2035 - 2042 1996年12月

DS/SS/GMSK with differential detection over multipath Rayleigh fading channels 査読有り

Wakaki I, Ishiguro T, Yamazato T, Katayama M, Ogawa A

IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES E79A 巻 ( 12 ) 頁： 1957 - 1962 1996年12月

Quasi-synchronous code division multiple access (CDMA) with binary shift-register sequences 査読有り

Kuno S, Yamazato T, Katayama M, Ogawa A

ELECTRONICS AND COMMUNICATIONS IN JAPAN PART III-FUNDAMENTAL ELECTRONIC SCIENCE 79 巻 ( 12 ) 頁： 71 - 81 1996年12月

Transmit permission control on spread ALOHA packets in LEO satellite systems 査読有り

Jamalipour A, Katayama M, Yamazato T, Ogawa A

IEEE JOURNAL ON SELECTED AREAS IN COMMUNICATIONS 14 巻 ( 9 ) 頁： 1748 - 1757 1996年12月

低軌道衛星を用いた海洋生物生態観測システム用受信機の一検討

徳安朋浩, 和田忠浩, 山里敬也, 片山正昭, 小川明

電子情報通信学会技術研究報告 SANE96 巻 ( 64 ) 頁： 67-72 1996年10月

A New M-ary Spread-Spectrum Multiple-Access Scheme in the Presence of Carrier Frequency Offset 査読有り

WADA Tadahiro, YAMAZATO Takaya, KATAYAMA Masaaki, OGAWA Akira

IEICE transactions on fundamentals of electronics, communications and computer sciences 79 巻 ( 9 ) 頁： 1415 - 1422 1996年9月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：The Institute of Electronics, Information and Communication Engineers

The performance of an M-ary spread-spectrum multiple-access (Al-ary/SSMA) scheme in the presence of carrier frequency offset is discussed in this paper. The influence of carrier frequency offset on the non-coherent reception of M-ary/SSMA signals is examined and it is shown that the carrier frequency off-set degrades the performance remarkably, yet, this influence has a distinctive property. Making use of this property, we propose a new M-ary/SSMA scheme that can mitigate the influence of the carrier frequency offset. The scheme is based on the assignment of two distinctive Hadamard codes to in-phase and quadrature components of the transmitted signal. The effect of simultaneous transmission is evaluated in terms of bit-error-rate performance with the carrier frequency offset. As the result, it is observed that the satisfactory bit-error-rate performance can be achieved in the presence of carrier frequency offset.

CiNii Research

低軌道衛星を用いた海洋生物生態観測システムの一検討

徳安朋浩, 山里敬也, 片山正昭, 小川明

1996年電子情報通信学会ソサイエティ大会 SB-2 巻 ( 12 ) 頁： - 1996年9月

A new M-ary spread-spectrum multiple-access scheme in the presence of carrier frequency offset 査読有り

Wada T, Yamazato T, Katayama M, Ogawa A

IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES E79A 巻 ( 9 ) 頁： 1415 - 1422 1996年9月

Coordinate interleaved trellis coded QPSK with T-algorithm on Rayleigh fading channel 査読有り

Nakamura H, Yamazato T, Katayama M, Ogawa A

IEICE TRANSACTIONS ON COMMUNICATIONS E79B 巻 ( 9 ) 頁： 1248 - 1255 1996年9月

Effects of multiple access interference in a multi-rate SSMA system 査読有り

Ichiba M, Katayama M, Yamazato T, Ogawa A

IEICE TRANSACTIONS ON COMMUNICATIONS E79B 巻 ( 9 ) 頁： 1333 - 1338 1996年9月

Effects of the access timing delay on CDMA unslotted ALOHA with channel load sensing 査読有り

Sato T, Okada H, Yamazato T, Katayama M, Ogawa A

IEICE TRANSACTIONS ON COMMUNICATIONS E79B 巻 ( 9 ) 頁： 1339 - 1345 1996年9月

A new M-ary spread-spectrum multiple-access scheme in the presence of carrier frequency offset 査読有り

T Wada, T Yamazato, M Katayama, A Ogawa

IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES E79A 巻 ( 9 ) 頁： 1415 - 1422 1996年9月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG

The performance of an M-ary spread-spectrum multiple-access (M-ary/SSMA) scheme in the presence of carrier frequency offset is discussed in this paper. The influence of carrier frequency offset on the non-coherent reception of M-ary/SSMA signals is examined and it is shown that the carrier frequency offset degrades the performance remarkably, yet, this influence has a distinctive property. Making use of this property, we propose a new M-ary/SSMA scheme that can mitigate the influence of the carrier frequency offset. The scheme is based on the assignment of two distinctive Hadamard codes to in-phase and quadrature components of the transmitted signal. The effect of simultaneous transmission is evaluated in terms of bit-error-rate performance with the carrier frequency offset. As the result, it is observed that the satisfactory bit-error-rate performance can be achieved in the presence of carrier frequency offset.

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マルチパスレイリーフェージング環境下における DS/SS/GMSK 信号の遅延検波について

若木勇, 山里敬也, 片山正昭, 小川明

電子情報通信学会技術研究報告 SST96 巻 ( 34 ) 頁： 37-42 1996年7月

CDMA unslotted ALOHA systems with packet retransmission control 査読有り

Okada H, Sato T, Yamazato T, Katayama M, Ogawa A

IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES E79A 巻 ( 7 ) 頁： 1004 - 1010 1996年7月

搬送波周波数偏差を伴うM-ary/SS信号の同期捕捉に関する一検討

和田忠浩, 山里敬也, 片山正昭, 小川明

電子情報通信学会技術研究報告 SST96 巻 ( 14 ) 頁： 81-86 1996年6月

Throughput analysis of DS/SSMA unslotted ALOHA system with fixed packet length 査読有り

Sato T, Okada H, Yamazato T, Katayama M, Ogawa A

IEEE JOURNAL ON SELECTED AREAS IN COMMUNICATIONS 14 巻 ( 4 ) 頁： 750 - 756 1996年5月

Adaptive Transmit Permission Control on Spread-Slotted Aloha Packets Applicable in LEOS Systems 査読有り

JAMALIPOUR Abbas, KATAYAMA Masaaki, YAMAZATO Takaya, OGAWA Akira

IEICE transactions on communications 79 巻 ( 3 ) 頁： 257 - 265 1996年3月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：The Institute of Electronics, Information and Communication Engineers

A new transmit permission control scheme applicable in multi-cell communication systems is proposed. In this scheme, by prohibiting the transmissions from the users with relatively high propagation loss to their connecting hub stations, level of multiple access interference is decreased, and hence throughput characteristics are improved. Moreover, we continue our discussion to propose two adaptive forms of the transmit permission control scheme, in which the prohibition condition becomes more intelligent by considering the level of the offered traffic loads to hub stations. These methods are utilized in a slotted Aloha random transmission of the spread spectrum packets, and on the uplinks of a low earth orbit satellite communication system as an example of the multi-cell systems. It is shown that the adaptive schemes exhibits significantly improved characteristics at all offered traffic loads in these systems.

CiNii Research

遠近問題とフェージングを考慮したCDMA ALOHA 方式のスループット特性についての一考察

西田邦生, 岡田啓, 佐藤毅, 山里敬也, 片山正昭, 小川明

1996年電子情報通信学会総合大会 SA-5 巻 ( 4 ) 頁： 472 1996年3月

擬似ランダム系列を用いたM-ary/SS/CDMAに関する一検討

小島英樹, 和田忠浩, 山里敬也, 片山正昭, 小川明

電子情報通信学会技術研究報告 SST95 巻 ( 141 ) 頁： 65-70 1996年3月

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