Faculty Profiles - YAMAZATO Takaya

Papers - YAMAZATO Takaya

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Computational Carrier Regeneration for Low Earth-Orbital Satellite Communication Systems

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

Technical Report of IEICE Vol. SAT93 ( 21 ) page： 13-18 1993.8

Near-Far Effect on Coded DS/FH/SSMA

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

Technical Report of IEICE Vol. SAT93 ( 33 ) page： 39275 1993.8

A Study on Quasi-Synchronous Spread Spectrum

S. Kuno, T. Yamazato, M. Katayama and A. Ogawa

Technical Report of IEICE Vol. SST93 ( 26 ) page： 43-48 1993.8

The Spread Slotted ALOHA System with Channel Load Sensing Protocol

K. Toshimitsu, T. Yamazato, M. Katayama and A. Ogawa

Technical Report of IEICE Vol. SST93 ( 4 ) page： 19-24 1993.6

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 Vol. SST93-3 page： 13-18 1993

A Novel Detection Technique for CPM Using Variable Mapping Method Reviewed

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

IEEE Pacific Rim Conference on Communication and Signal Processing (PACRIM) Vol. PACRIM93 page： 573-576 1993

Reduced Path Viterbi Decoder with Inverse Circuit of Encoder Reviewed

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

IEEE Pacific Rim Conference on Communication and Signal Processing (PACRIM) Vol. PACRIM93 page： 569-572 1993

Carrier Regeneration in a Block Demodulator for Low Earth-Orbital Satellite Communication Systems Reviewed

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

IEEE International Symposium on Personal Indoor and Mobile Radio Communications Vol. PIMRC93 ( C3-6 ) page： 458-462 1993

A New Source Coding Method Based on LZW Adopting the Least Recently Used Deletion Heuristic Reviewed

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

IEEE Pacific Rim Conference on Communication and Signal Processing (PACRIM) Vol. PACRIM93 page： 190-193 1993

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 page： 512 1993

Configuration of the Receiver for Nonlinearly Amplified Spread Spectrum Signals in CDMA Systems Reviewed

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

International Symposium on Nonlinear Theory and its Applications (NOLTA) Vol. 7 ( 39207 ) page： 875-878 1993

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 page： 502 1993

A New Viterbi Algorithm with Adaptive Path Reduction Method Invited

Takaya Yamazato, Iwao Sasase, Shinsaku Mori

IEICE Transaction on Fundamental of Electronics, communications and computer science Vol. E76-A ( 9 ) page： 1422-1429 1993

Trellis Coded Modulation Using Totally Overlapped Signal Sets Invited

Masayuki Ariyoshi, Takaya Yamazato, Iwao Sasase , Shinsaku Mori

IEICE Transaction on Communications Vol. E76-B ( 3 ) page： 304-309 1993

A New Viterbi Algorithm with Adaptive Path Reduction Method Reviewed

YAMAZATO T., Sasase Iwao, Mori Shinsaku

IEICE Trans. Fundamentals Vol. 76 ( 9 ) page： 1422 - 1429 1993

Language：English Publishing type：Research paper (scientific journal) Publisher：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 Reviewed

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 Vol. 2 page： 653 - 657 1993

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：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 Reviewed

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 page： 569 - 572 1993

INTERLACE CODING SYSTEM INVOLVING DATA-COMPRESSION CODE, DATA ENCRYPTION CODE AND ERROR CORRECTING CODE Reviewed

T YAMAZATO, SASASE, I, S MORI

IEICE TRANSACTIONS ON COMMUNICATIONS Vol. E75B ( 6 ) page： 458 - 465 1992.6

Language：English Publishing type：Research paper (scientific journal) Publisher：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.

Web of Science

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Interlace Coding System Involving Data Compaction Code, Data Eucryption Code and Error Correcting Code Invited

Takaya Yamazato, Iwao Sasase, Shinsaku Mori

IEICE Transaction on Communications Vol. E.75-B ( 6 ) page： 458-465 1992

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

Takaya Yamazato, Shinjiro Oshita, Iwao Sasase, Shinsaku Mori

IEICE Transaction on Fundamentals of Electronics, Communications and Computer Sciences Vol. E.74-A ( 9 ) page： 2579-2585 1991

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Papers - YAMAZATO Takaya