研究者詳細 - 山里　敬也

論文 - 山里　敬也

分割表示 1,501 件中 1,281 - 1,300 件目／全件表示 >>

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

K. Ban, M. Katayama, T. yamazato and A. Ogawa

電子情報通信学会英文論文誌 E80-B 巻 ( 12 ) 頁： 1790-1796 1997年

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

T. Wada, T. Yamazato, M. Katayama and A. Ogawa

電子情報通信学会英文論文誌 E80-A 巻 ( 12 ) 頁： 2477-2484 1997年

[Invited Paper] CDMA for Personal Communications Based on Low Earth Orbital Satellite Systems 招待有り査読有り

A. Ogawa, M. Katayama, T. Yamazato, A. Jamalipour

電子情報通信学会英文論文誌 E80-A 巻 ( 12 ) 頁： 2347-2356 1997年

低軌道周回衛星を用いた海亀生態観測システムにおける海亀搭載送信用アンテナ

天野良晃、徳安朋浩、山里敬也、片山正昭、小川明

1997年電気関係学会東海支部連合大会頁： 507 1997年

低軌道周回衛星を用いた海亀生態観測システムにおける海亀搭載データ処理装置

北村唯夫、徳安朋浩、山里敬也、片山正昭、小川明

1997年電気関係学会東海支部連合大会頁： 506 1997年

レイリーフェージング下におけるスペクトル拡散信号のダイバシチ同期補捉手法の提案

猪飼洋平、片山正昭、山里敬也、小川明

1997年電気関係学会東海支部連合大会頁： 508 1997年

マルチコードCDMA方式における振幅変動の影響

藤原昭博、山里敬也、片山正昭、小川明

1997年電気関係学会東海支部連合大会頁： 509 1997年

A proposal of SS communication system using LEO satellite for observing ecology of sea turtles 査読有り

Tokuyasu T, Wada T, Yamazato T, Katayama M, Ogawa A

GLOBECOM 97 - IEEE GLOBAL TELECOMMUNICATIONS CONFERENCE, CONFERENCE RECORD, VOLS 1-3 頁： 1157 - 1161 1997年

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

Ogawa A.

IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences E80-A 巻 ( 12 ) 頁： 2347 - 2355 1997年

Convolutionally coded DS/CDMA system using multi-antenna transmission 査読有り

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

GLOBECOM 97 - IEEE GLOBAL TELECOMMUNICATIONS CONFERENCE, CONFERENCE RECORD, VOLS 1-3 頁： 92 - 96 1997年

Performance analysis of CDMA-unslotted ALOHA operating over CDMA voice signals 査読有り

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

1997 IEEE PACIFIC RIM CONFERENCE ON COMMUNICATIONS, COMPUTERS AND SIGNAL PROCESSING, VOLS 1 AND 2 頁： 603 - 606 1997年

Simultaneous estimation of code and frequency of DS/SS signals of multiple-LEO-satellite communication systems 査読有り

Ishizu M, Katayama M, Yamazato T, Ogawa A

PIMRC '97 - EIGHTH IEEE INTERNATIONAL SYMPOSIUM ON PERSONAL, INDOOR AND MOBILE RADIO COMMUNICATIONS: WAVES OF THE YEAR 2000+, TECHNICAL PROGRAM, PROCEEDINGS, VOLS 1-3 頁： 1019 - 1023 1997年

System capacity of an integrated voice and data CDMA network in channel load sensing protocol 査読有り

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

GLOBECOM 97 - IEEE GLOBAL TELECOMMUNICATIONS CONFERENCE, CONFERENCE RECORD, VOLS 1-3 頁： 899 - 903 1997年

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 E80-A 巻 ( 12 ) 頁： 2477 - 2483 1997年

記述言語：日本語掲載種別：研究論文（学術雑誌）出版者・発行元：IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences

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).

Scopus

A proposal of SS communication system using LEO satellite for observing ecology of sea turtles 査読有り

T Tokuyasu, T Wada, T Yamazato, M Katayama, A Ogawa

GLOBECOM 97 - IEEE GLOBAL TELECOMMUNICATIONS CONFERENCE, CONFERENCE RECORD, VOLS 1-3 頁： 1157 - 1161 1997年

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）出版者・発行元：IEEE

In this paper, we examine the system for observing ecology of sea animals by means of a low earth orbital observatory satellite. We consider the system performance in the uplink, which is the communication link from the animal stations to the observatory satellite. Since the up-link condition is much severe, we employ the M-ary/SS with CDMA ALOHA as a multiple access scheme. A key issue to realize the system depends on an acquisition technique which is robust to the effect of large Doppler shift caused by the rapid movement of the low earth orbital satellite. Ih this paper, we discuss code-acquisition and estimation of carrier frequency considering the M-ary/SS/CDMA technique to realize this observatory system.

Web of Science

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An initial acquisition method for M-ary spread-spectrum signals using hadamard code sequences 査読有り

Wada T., Yamazato T., Katayama M., Ogawa A.

IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences E80-A 巻 ( 11 ) 頁： 2172 - 2179 1997年

記述言語：日本語掲載種別：研究論文（学術雑誌）出版者・発行元：IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences

In this paper, we examine a new initial symbol acquisition method for M-ary spread-spectrum (M-ary/SS) signals that are affected by large carrier frequency offset. By the effect of the carrier frequency offset, preamble signal energy is dispersed to the undesired outputs. The proposed method is based on the collection of such dispersed signal energies by using reference patterns. The reference patterns are constructed by using the characteristic of Hadamard code sequences. The effectiveness of the proposed method is evaluated in terms of mean acquisition time.

Scopus

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

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

IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences E80-A 巻 ( 12 ) 頁： 2526 - 2532 1997年

記述言語：日本語掲載種別：研究論文（学術雑誌）出版者・発行元：IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences

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.

Scopus

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 E80-B 巻 ( 12 ) 頁： 1790 - 1796 1997年

記述言語：日本語掲載種別：研究論文（学術雑誌）出版者・発行元：IEICE Transactions on Communications

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.

Scopus

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

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

ECSC-4: 4TH EUROPEAN CONFERENCE ON SATELLITE COMMUNICATIONS 頁： 176 - 181 1997年

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）出版者・発行元：ASSOC ELETTROTECHNICA ED ELETTRONICA ITALIANA

In this paper, we focus on an integrated voice and data system over unslotted CDMA system. We propose a method to accommodate the data packet into the silence period of voice signal by using a traffic control based on the channel load sensing protocol. We evaluate the system by the throughput and delay performance for data packet, the blocking probability for voice users. From the results, we show the advantages of the proposed system.

Web of Science

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固定長パケットCDMA Unslotted ALOHA方式の近似法に関する一検討

岡田啓, 佐藤毅, 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 ( 61 ) 頁： 13-18 1996年12月

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論文 - 山里　敬也