研究者詳細 - 山里　敬也

論文 - 山里　敬也

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Hierarchical transmission system using multi-code/multi-rate DS/SS modulation 査読有り

Yamazato T, Makido S, Katayama M, Ogawa A

GLOBECOM 98: IEEE GLOBECOM 1998 - CONFERENCE RECORD, VOLS 1-6 頁： 2147 - 2152 1998年

NeW Quasi-Synchronous Sequences for CDMA Slotted ALOHA Systems 査読有り

Saito M.

IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences E81-A 巻 ( 11 ) 頁： 2274 - 2280 1998年

Performance Evaluation of DS/CDMA communications systems modulated with f -shift bpsk over multipath rayleigh fading channels 査読有り

Asadullah Galib M.

IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences E81-A 巻 ( 11 ) 頁： 2304 - 2310 1998年

Queueing analysis of CDMA slotted ALOHA systems with finite buffer and finite population assumptions 査読有り

Okada H, Yamazato T, Katayama M, Ogawa A

ICC 98 - 1998 IEEE INTERNATIONAL CONFERENCE ON COMMUNICATIONS VOLS 1-3 頁： 407 - 411 1998年

Problems of implementing adaptive array antennas in CDMA systems 査読有り

Morimoto A, Katayama M, Yamazato T, Ogawa A

NINTH IEEE INTERNATIONAL SYMPOSIUM ON PERSONAL, INDOOR AND MOBILE RADIO COMMUNICATIONS, VOLS 1-3 頁： 1422 - 1426 1998年

A Constant Amplitude Coding for Orthogonal Multi-Code CDMA Systems 査読有り

WADA Tadahiro, YAMAZATO Takaya, KATAYAMA Masaaki, OGAWA Akira

IEICE TRANS. FUNDAMENTALS, A 80 巻 ( 12 ) 頁： 2477 - 2484 1997年12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

In this paper, we present orthogonal multi-code CDMA systems with the constant amplitude transmission. In general, the dynamic range of the amplitude of the transmitting signal is very large in the case of orthogonal multi-code CDMA systems. In order to realize the constant amplitude transmission for orthogonal multi-code CDMA systems, we propose a constant amplitude coding. First, we show the basic concept of the constant amplitude coding. And then, we show that the constant amplitude transmission can be realized by the combination of the conventional orthogonal multi-code CDMA and the constant amplitude coding. Finally, the effectiveness of the proposed method is evaluated in terms of the bit error rate performance and it is shown that the proposed method is robust to the non-linear distortion caused by a high power amplifier(HPA).

CiNii Research

A Simple Transmit/Receive Antenna Diversity for Indoor DS/CDMA Wireless Communication Systems 査読有り

BAN Koichiro, KATAYAMA Masaaki, YAMAZATO Takaya, OGAWA Akira

IEICE Trans. Commun. 80 巻 ( 12 ) 頁： 1790 - 1796 1997年12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

This paper proposes a direct-sequence spread spectrum (DS/SS) communication system with a new diversity technique designed for indoor multi-path fading channels where path diversity isn't available. In this system, the transmitter sends a same signal from multiple antennas at the same time with intentional time delays, which allows the receiver to distinguish and combine the signals from different antennas. We also consider the combination of this scheme with the conventional receiving antenna diversity for additional diversity gain. Furthermore, it is found that the use of the multiple transmitting antennas decreases the effect of the multiple access interference.

CiNii Research

A Spread-Spectrum System with Dual Processing Gains Designed for Cyclic Noise in Power Line Communications 査読有り

NIWA Hisashi, OONO Osamu, KATAYAMA Masaaki, YAMAZATO Takaya, OGAWA Akira, ISAKA Noriyuki

IEICE Trans. Fundamentals, A 80 巻 ( 12 ) 頁： 2526 - 2533 1997年12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

We propose a spread-spectrum power line communication system considering the cyclic features of the noise in the lines. For this purpose, we model the noise as the sum of a time-invariant stationary process and two cyclostationary processes, i.e., cyclic continuous noise and cyclic impulsive noise. The proposed system employs two different countermeasures to each of these two classes of cyclic noise. For the cyclic continuous noise, it uses multiple-processing-gain spread spectrum technique: the smaller processing gains are assigned for the periods with lower instantaneous noise power and the larger ones for the periods of higher noise power. Considering the cyclic impulsive noise, convolutional coding with interleaving is applied. In order to analyze the performance improvement, due to the employment of multiple processing gains, we introduce a simple model of the continuous noise. The overall performance is evaluated by computer simulation with the actual noise wave-form measured in power lines.

CiNii Research

直交ゴールド系列を基に生成した拡散系列を用いた準同期CDMA ALOHA方式

齋藤将人, 山里敬也, 片山正昭, 小川明

第20回情報理論とその応用シンポジウム SITA97 巻 ( 5-4-5 ) 頁： 589-592 1997年12月

各ユーザが有限バッファを持つCDMA ALOHA方式の特性解析

岡田啓, 山里敬也, 片山正昭, 小川明

第20回情報理論とその応用シンポジウム SITA97 巻 ( 4-3-6 ) 頁： 409-412 1997年12月

直交マルチコードCDMAシステムのための定振幅符号化の誤り訂正能力について

和田忠浩, 山里敬也, 片山正昭, 小川明

第20回情報理論とその応用シンポジウム SITA97 巻 ( 5-4-6 ) 頁： 593-596 1997年12月

A constant amplitude coding for orthogonal multi-code CDMA systems 査読有り

Wada T, Yamazato T, Katayama M, Ogawa A

IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES E80A 巻 ( 12 ) 頁： 2477 - 2484 1997年12月

A spread-spectrum system with dual processing gains designed for cyclic noise in power line communications 査読有り

Niwa H, Oono O, Katayama M, Yamazato T, Ogawa A, Isaka N

IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES E80A 巻 ( 12 ) 頁： 2526 - 2533 1997年12月

A simple transmit/receive antenna diversity for indoor DS/CDMA wireless communication systems 査読有り

Ban K, Katayama M, Yamazato T, Ogawa A

IEICE TRANSACTIONS ON COMMUNICATIONS E80B 巻 ( 12 ) 頁： 1790 - 1796 1997年12月

CDMA for personal communications based on low Earth-orbital satellite systems 査読有り

Ogawa A, Katayama M, Yamazato T, Jamalipour A

IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES E80A 巻 ( 12 ) 頁： 2347 - 2356 1997年12月

Effects of transmission control in an integrated voice and data CDMA system 査読有り

Sato T, Sandouk A, Yamazato T, Katayama M, Ogawa A

IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES E80A 巻 ( 12 ) 頁： 2509 - 2516 1997年12月

Multi-antenna transmission scheme for convolutionally coded DS/CDMA system 査読有り

Ban K, Katayama M, Stark WE, Yamazato T, Ogawa A

IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES E80A 巻 ( 12 ) 頁： 2437 - 2444 1997年12月

A constant amplitude coding for orthogonal multi-code CDMA systems 査読有り

T Wada, T Yamazato, M Katayama, A Ogawa

IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES E80A 巻 ( 12 ) 頁： 2477 - 2484 1997年12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

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A simple transmit/receive antenna diversity for indoor DS/CDMA wireless communication systems 査読有り

K Ban, M Katayama, T Yamazato, A Ogawa

IEICE TRANSACTIONS ON COMMUNICATIONS E80B 巻 ( 12 ) 頁： 1790 - 1796 1997年12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

This paper proposes a direct-sequence spread spectrum (DS/SS) communication system with a new diversity technique designed for indoor multi-path Fading channels where path diversity isn't available. In this system, the transmitter sends a same signal from multiple antennas at the same time with intentional time delays, which allows the receiver to distinguish and combine the signals from different antennas. We also consider the combination of this scheme with the conventional receiving antenna diversity for additional diversity gain. Furthermore, it is found that the use of the multiple transmitting antennas decreases the effect of the multiple access interference.

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A spread-spectrum system with dual processing gains designed for cyclic noise in power line communications 査読有り

H Niwa, O Oono, M Katayama, T Yamazato, A Ogawa, N Isaka

IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES E80A 巻 ( 12 ) 頁： 2526 - 2533 1997年12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

We propose a spread-spectrum power line communication system considering the cyclic features of the noise in the lines. For this purpose, we model the noise as the sum of a time-invariant stationary process and two cyclostationary processes, i.e., cyclic continuous noise and cyclic impulsive noise. The proposed system employs two different countermeasures to each of these two classes of cyclic noise. For the cyclic continuous noise, it uses multiple-processing-gain spread spectrum technique: the smaller processing gains are assigned for the periods with lower instantaneous noise power and the larger ones for the periods of higher noise power, Considering the cyclic impulsive noise, convolutional coding with interleaving is applied. In order to analyze the performance improvement due to the employment of multiple processing gains, we introduce a simple model of the continuous noise. The overall performance is evaluated bu computer simulation with the actual noise wave-form measured in power lines.

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