研究者詳細 - 山里　敬也

論文 - 山里　敬也

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低軌道衛星通信システムにおける計算的搬送波再生

宇野靖, 片山正昭, 山里敬也, 小川明

電子情報通信学会技術研究報告 SAT93 巻 ( 21 ) 頁： 13-18 1993年8月

誤り訂正符号を用いたDS/FH/SSMA方式における遠近効果

真梶康彦, 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 SAT93 巻 ( 33 ) 頁： 39275 1993年8月

準同期スペクトル拡散通信方式に関する一考察

久野誠史, 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 SST93 巻 ( 26 ) 頁： 43-48 1993年8月

チャネルロードセンシングを用いたSpread Slotted ALOHA方式

利光清, 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 SST93 巻 ( 4 ) 頁： 19-24 1993年6月

干渉波除去を用いたQPSK信号とSS信号の重畳伝送システム

各務綾加, 片山正昭, 山里敬也, 小川明

電子情報通信学会技術研究報告 SST93-3 巻頁： 13-18 1993年

A Novel Detection Technique for CPM Using Variable Mapping Method 査読有り

K. Nemoto, T. Yamazato, I. Sasase and S. Mori

IEEE Pacific Rim Conference on Communication and Signal Processing (PACRIM) PACRIM93 巻頁： 573-576 1993年

Reduced Path Viterbi Decoder with Inverse Circuit of Encoder 査読有り

T. Yamazato, I. Sasase, S. Mori, M. Katayama and A. Ogawa

IEEE Pacific Rim Conference on Communication and Signal Processing (PACRIM) PACRIM93 巻頁： 569-572 1993年

Carrier Regeneration in a Block Demodulator for Low Earth-Orbital Satellite Communication Systems 査読有り

Y. Uno, M. Katayama, T. Yamazato and A. Ogawa

IEEE International Symposium on Personal Indoor and Mobile Radio Communications PIMRC93 巻 ( C3-6 ) 頁： 458-462 1993年

A New Source Coding Method Based on LZW Adopting the Least Recently Used Deletion Heuristic 査読有り

S. Hayasi, J. Kubo, T. Yamazato, I. Sasase and S. Mori

IEEE Pacific Rim Conference on Communication and Signal Processing (PACRIM) PACRIM93 巻頁： 190-193 1993年

三衛星を用いた移動体通信・測位統合システムの一方式

竹田真人, 片山正昭, 山里敬也, 小川明

1993年電気学会東海支部連合大会頁： 512 1993年

Configuration of the Receiver for Nonlinearly Amplified Spread Spectrum Signals in CDMA Systems 査読有り

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

International Symposium on Nonlinear Theory and its Applications (NOLTA) 7 巻 ( 39207 ) 頁： 875-878 1993年

適応的にパス削減を行うビタビ復号法

山里敬也, 片山正昭, 小川明

1993年電気学会東海支部連合大会頁： 502 1993年

A New Viterbi Algorithm with Adaptive Path Reduction Method 招待有り

Takaya Yamazato, Iwao Sasase, Shinsaku Mori

電子情報通信学会英文論文誌 E76-A 巻 ( 9 ) 頁： 1422-1429 1993年

Trellis Coded Modulation Using Totally Overlapped Signal Sets 招待有り

Masayuki Ariyoshi, Takaya Yamazato, Iwao Sasase , Shinsaku Mori

電子情報通信学会英文論文誌 E76-B 巻 ( 3 ) 頁： 304-309 1993年

A New Viterbi Algorithm with Adaptive Path Reduction Method 査読有り

YAMAZATO T., Sasase Iwao, Mori Shinsaku

IEICE Trans. Fundamentals 76 巻 ( 9 ) 頁： 1422 - 1429 1993年

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 Viterbi algorithm with adaptive path reduction method is presented. The proposed system consists of the pre-decoder and reduced path Viterbi decoder. The pre-decoder separates the mixed channel noise from the received sequence [6]-[9]. The number of errors in the pre-decoded error sequence is counted and the path reduction is implemented by the number of errors in pre-decoded error sequence. The path reduction is implemented as a function of channel condition because the errors in the pre-decoded error sequence can be considered as the channel error sequence. Due to the reduction of the path, the number of ACS (add compare select) operations can be reduced, which occupies the dominant part in Viterbi decoding. The ACS reduction ratio for the proposed system achieves up to 30 for the case of (2, 1, 2) Ungerboeck code without degradation of the error performance.

CiNii Research

A novel trellis coded modulation system without signal point expansion 査読有り

Ariyoshi M., Yamazato T., Sasase I., Mori S.

Proceedings of 2nd IEEE International Conference on Universal Personal Communications: Gateway to the 21st Century, ICUPC 1993 2 巻頁： 653 - 657 1993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：Proceedings of 2nd IEEE International Conference on Universal Personal Communications: Gateway to the 21st Century, ICUPC 1993

In conventional trellis coded modulation (TCM), the number of signal points in the constellation is doubled by additional redundant bits. This paper proposes a novel TCM system without signal point expansion which employs 2m kinds of trellis paths depending upon m encoder input bits, instead of 2/sup m+1/ kinds of paths of conventional TCM. The number of cosets assigned to trellis paths and total number of signal points can be reduced to half of those in conventional TCM. Therefore, it is possible to implement a coded modulation systems without signal point expansion by additional redundant bits, and the effective bit rate becomes unity. This scheme achieves a considerable coding gain in comparison to the traditional uncoded systems, and to the conventional TCM system. Furthermore, as the proposed scheme needs only half the signal points of conventional TCM, the average power is lower and it is less sensitive to the carrier phase offset.

DOI： 10.1109/ICUPC.1993.528462

Scopus

REDUCED PATH VITERBI DECODER WITH INVERSE CIRCUIT OF THE ENCODER 査読有り

T YAMAZATO, SASASE, I, S MORI, M KATAYAMA, A OGAWA

IEEE PACIFIC RIM CONFERENCE ON COMMUNICATIONS, COMPUTERS AND SIGNAL PROCESSING : PROCEEDINGS, VOLS 1 AND 2 頁： 569 - 572 1993年

INTERLACE CODING SYSTEM INVOLVING DATA-COMPRESSION CODE, DATA ENCRYPTION CODE AND ERROR CORRECTING CODE 査読有り

T YAMAZATO, SASASE, I, S MORI

IEICE TRANSACTIONS ON COMMUNICATIONS E75B 巻 ( 6 ) 頁： 458 - 465 1992年6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

An Interlace Coding System (ICS) involving data compression code, data encryption code and error correcting code is proposed and its error performance on additive white Gaussian noise (AWGN) channel with quadrature phase shift keying (QPSK) is analyzed. The proposed system handles data compression, data encryption and error correcting processes together, i.e. adds error correcting redundancy to the block lists of the dictionary in which compression system constructs to reduce source redundancy. Each block list is encoded by Ziv-Lempel code and Data Encryption Standard (DES). As the catastrophic condition determined by the data compression procedure is not negligible, error correcting redundancy should be added so as to avoid catastrophic condition. We found that the catastrophic condition depends only on the size of the dictionary for our proposed system. Thus, by employing a large dictionary, good error performance can be applied by the proposed system and the catastrophic condition can be avoided.

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Interlace Coding System Involving Data Compaction Code, Data Eucryption Code and Error Correcting Code 招待有り

Takaya Yamazato, Iwao Sasase, Shinsaku Mori

電子情報通信学会英文論文誌 E.75-B 巻 ( 6 ) 頁： 458-465 1992年

The Arrangement Technique of Gray-Code Table for Modified QAM and Triangular Shaped Signal Sets 招待有り

Takaya Yamazato, Shinjiro Oshita, Iwao Sasase, Shinsaku Mori

電子情報通信学会英文論文誌 E.74-A 巻 ( 9 ) 頁： 2579-2585 1991年

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