Faculty Profiles - YAMAZATO Takaya

Papers - YAMAZATO Takaya

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A Study on the Throughput of Multi-Code CDMA ALOHA System with Modified Channel Load Sensing Protocol

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

Technical Report of IEICE Vol. SST98 ( 40 ) page： 61-68 1998.10

Parallel Transmission of Huffman Code Under Fading Environment

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

Technical Report of IEICE Vol. CS98 ( 117 ) page： IE98-96 1998.10

Performance of a LEOS Communication System with Overlaid and Overlapped Cell Arrangement

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

Technical Report of IEICE Vol. SAT98 ( 42 ) page： 39090 1998.10

Handoff Performance of LEO Satellite Communication Systems with Overlapped-Cell Arrangement

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

1998 IEICE General Conference Vol. SB-3 ( 13 ) page： 556-557 1998.10

Error correcting capability of constant amplitude coding for orthogonal multi-code CDMA systems Reviewed

Wada T, Yamazato T, Katayama M, Ogawa A

IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES Vol. E81A ( 10 ) page： 2166 - 2169 1998.10

Queueing analysis of CDMA unslotted ALOHA systems with finite buffers Reviewed

Okada H, Yamazato T, Katayama M, Ogawa A

IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES Vol. E81A ( 10 ) page： 2083 - 2091 1998.10

Queueing Analysis of CDMA Unslotted ALOHA Systems with Finite Buffers Reviewed

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

IEICE Transaction on Fundamentals Vol. E81-A ( 10 ) page： 2083-2091 - 2091 1998.10

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

CDMA unslotted ALOHA system with finite size of quenueing buffers is discussed in this paper. We introduce an analytical model in which the system is divided into two Markov chains; one is in the user part, and the other is in the channel part. In the user part, we can model the queueing behavior of the user station as an M/G/1/B queue. In the channel part, we can consider the number of simulataneously transmitted packets as an M_1+M_2/D/∞//K queue. We analyze the queueing system by using this analytical model, and evaluate the effect of buffer capacity in terms of the throughput, the rejection probability and the average delay. As a result, increase in the buffer size brings about an improvement in the grade of service in terms of higher throughput and lower rejection probability.

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Throughput Performance of QS-CDMA Slotted ALOHA System on 2-path Rayleigh Fading Environment Reviewed

SAITO Masato, YAMAZATO Takaya, KATAYAMA Masaaki, OGAWA Akira

Proceedings of the Society Conference of IEICE Vol. 1998 page： 99 1998.9

Performance of Transmit/Receive Antenna Diversity with FEC Coding under Correlated Rician Fading Channels

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

1998 IEICE General Conference Vol. A-5 ( 8 ) page： 98 1998.9

Throughput Performance of QS-CDMA Slotted ALOHA System on 2-path Rayleigh Fading Environment

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

1998 Society Conference of IEICE Vol. A-5-9 page： 99 1998.9

A Study on Reducing the Nonlinear Distortion in OFDM Systems

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

Technical Report of IEICE Vol. RCS98 ( 61 ) page： 25-30 1998.7

Throughput Analysis for CDMA Unslotted ALOHA Systems with Finite Population Assumption Reviewed

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

IEICE Transaction on Fundamentals of Electronics, Communications and Computer Sciences Vol. J81-A ( 7 ) page： 1089-1092 1998.7

CDMA slotted ALOHA system with finite buffers Reviewed

Okada H, Yamazato T, Katayama M, Ogawa A

IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES Vol. E81A ( 7 ) page： 1473 - 1478 1998.7

CDMA Slotted ALOHA System with Finite Buffers Reviewed

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

IEICE Transaction on Fundamentals Vol. E81-A ( 7 ) page： 1473-1478 - 1478 1998.7

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

In this paper, CDMA slotted ALOHA system with finite size of buffers is proposed. To analyze the system performance, we use the linear approximate solution based on restricted occupancy urn models. We evaluate the system performance in terms of throughput, average delay, and rejection probability and clarify the effect of buffer capacity.

CiNii Books

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Throughput Analysis for CDMA Unslotted ALOHA Systems with Finite Population Assumption Reviewed

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

IEICE Transaction on Fundamentals Vol. J81-A ( 7 ) page： 1089-1092 1998.7

An improvement in the performance of DS/SS/CDMA with GMSK Reviewed

Ishiguro T, Yamazato T, Katayama M, Ogawa A

ELECTRONICS AND COMMUNICATIONS IN JAPAN PART I-COMMUNICATIONS Vol. 81 ( 6 ) page： 51 - 60 1998.6

An improvement in the performance of DS/SS/CDMA with GMSK Reviewed

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

Electronics and Communications in Japan, Part I: Communications (English translation of Denshi Tsushin Gakkai Ronbunshi) Vol. 81 ( 6 ) page： 51 - 60 1998.6

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Electronics and Communications in Japan, Part I: Communications (English translation of Denshi Tsushin Gakkai Ronbunshi)

The CDMA system using DS/SS/GMSK modulation can realize a high spectral efficiency by using the constant-envelope property of GMSK modulation, even if the signal is band-limited and the transmitter is nonlinear. This paper discusses the optimization of a receiver in order to further improve spectral efficiency. The idea is to apply optimal weights to the despreading matrix. Using the signal-to-noise power ratio based on a linear approximation to the DS/SS/GMSK waveform, the weights that minimize the signal-to-noise power ratio are determined. The performance is compared to that of the conventional receiver, in terms of the signal-to-noise power ratio after despreading, the bit error rate, and the spectral efficiency. As a result, we show that performance is improved by applying optimal weights to the despreading matrix. © 1998 Scripta Technica. Electron Comm Jpn Pt 1, 81(6): 51-60, 1998.

DOI： 10.1002/(sici)1520-6424(199806)81:6<51::aid-ecja6>3.3.co;2-h

Scopus

An improvement in the performance of DS/SS/CDMA with GMSK Reviewed

T Ishiguro, T Yamazato, M Katayama, A Ogawa

ELECTRONICS AND COMMUNICATIONS IN JAPAN PART I-COMMUNICATIONS Vol. 81 ( 6 ) page： 51 - 60 1998.6

Language：English Publishing type：Research paper (scientific journal) Publisher：SCRIPTA TECHNICA-JOHN WILEY & SONS

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The Effect of Channel Error on H.263 Image Transmission

M. Honjo, S. Makido, T. Yamazato, M. Katayama and A. Ogawa

1998 IEICE General Conference, vol.B-5-234, p.598 (1998-3) Vol. B-5 ( 234 ) page： 598 1998.3

A Channel Control Scheme using Channel State Information in Multi-Carrier Transmission

T. Shibata, M. Fujimoto, N. Suzuki, K. Nishikawa, T. Yamazato and A. Ogawa

1998 IEICE General Conference Vol. B-5 ( 23 ) page： 387 1998.3

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Papers - YAMAZATO Takaya