Faculty Profiles - YAMAZATO Takaya

Papers - YAMAZATO Takaya

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An Initial Code Acqusition Scheme for Indoor Packet DS/SS Systems with Macro/Micro Antenna Diversity Reviewed

Y. Ikai, M. Katayama, T. Yamazato, A. Ogawa

IEICE Transaction on Fundamentals of Electronics, Communications and Computer Sciences Vol. E83-A ( 11 ) page： - 2000

A Study on Cross-Correlation Property in Orthogonal Multi-Code CDMA Systems Reviewed

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

IEICE Transaction on Fundamentals of Electronics, Communications and Computer Sciences Vol. J83 ( 5 ) page： 589-593 2000

Adaptive Transmit Permission Probability Control in CDMA Cellular Packet Communications with Site Diversity Reviewed

K. Mori, T. Kobayashi, T. Yamazato, A. Ogawa

IEICE Transaction on Communications. Vol. E83-B ( 7 ) page： - 2000

Effects of Cell Structure on Quality of Service of LEOS Communication Systems Reviewed

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

IEICE Transaction on Communications Vol. E83-B ( 4 ) page： 782-790 2000

Service Fairness in CDMA Cellular Packet Systems with Site Diversity Reception, Reviewed

K. Mori, T. Kobayashi, T. Yamazato, A. Ogawa

IEICE Transaction on Communications Vol. E82-B ( 12 ) page： 1964-1973 2000

Throughput Analysis of TCP in Wireless Environment

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

Technical Report of IEICE Vol. RCS99-232 page： 107-113 2000

Evaluation of Interference between UP- and Down-Links on CDMA Cellular Packet Systems Employing a Shared-TDD Scheme

K. Mori, T. Kobayashi, T. Yamazato, and A. Ogawa

General Conference of IECIE Vol. SB-3-2 page： 739 2000

A Study on Noise Enhancement and Cross Correlation in Synchronous CDMA Systems with Decorrelating Detector

Masato Saito, Hiraku Okada, Takaya Yamazato, Masaaki Katayama, Akira Ogawa

Technical Report of IEICE Vol. SST page： - 2000

Chip by Chip Turbo Coded CDMA System

T. Yamazato

YRP Telecom Summit, YRP, Yokosuka, Japan Vol. YRP page： - 2000

A Note on a Transmit Adaptive Array Antennas and its Capacity Enhancementin a cellular CDMA

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

Technical Report of IEICE Vol. SST-2000-20 page： 39275 2000

Influence of Beam Pattern on the Capacity of LEOS Communication Systems Reviewed

N. Ichikawa, M. Katayama T. Yamazato and A. Ogawa

ISCOM'99, Kaohsiung, Taiwan Vol. ISCOM'99 page： - 2000

Code Acquisition of a DS/SS Signal with Transmit and Receive Antenna Diversity Reviewed

Y. Ikai, M. Katayama,T. Yamazato, A. Ogawa

IEICE Transaction on Communications Vol. E82-A ( 12 ) page： 2728-2734 2000

OFDM Systems with Reduced Nonlinear Effect Reviewed

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

IEEE Vehicular Technology Conference (VTC Fall) Vol. VTC2000 page： - 2000

OFDM Systems with Multiple Trellis Coded Modulation Reviewed

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

IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC) Vol. PIMRC2000 page： - 2000

Adaptive Array Antennas for the Base Station of a Multi Processing Gain CDMA System Reviewed

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

IEICE Transaction on Communications Vol. E82-A ( 12 ) page： 2687-2696 2000

A Study on Constant Amplitude Transmission for Orthogonal Multicode Systems Reviewed

T. Wada, and T. Yamazato

International Symposium on Information Theory and Its Applications (ISITA) Vol. ISITA2000 page： 576-579 2000

Language：English

In this paper, we deal with the constant amplitude orthogonal multicode systems. The constant amplitude transmission has the advantage of the high power efficiency because the high power amplifier which has non-linear characteristic can be applied for the amplification of the signals. In this paper, we show the bent sequences can achieve the constant amplitude transmission and also show the effectiveness of the constant amplitude transmission in terms of symbol error rate.

A Study on Weight Control Scheme of Adaptive Array Antennas with Interference Canceler

Takayuki Suzuki, Masaaki Katayama, Takaya Yamazato, Akira Ogawa

Technical Report of IEICE Vol. RCS page： - 2000

Throughput Performance of CDMA Unslotted ALOHA System with Successive Interference Cancellation considering Detection Error of Packet Existance Reviewed

Y. Tadokoro, H. Okada, M. Saito, T. Yamazato, M. Katayama, A. Ogawa

International Symposium on Information Theory and Its Applications (ISITA) Vol. ISITA2000 page： 728-731 2000

Language：English

In CDMA ALOHA system, Multiple Access Interference(MAI) is in existence and it has large influence on the system performance. To suppress the influence, we proposed new system in which SIC is applied to CDMA Unslotted ALOHA. But because of random access and time-short packets, it is very difficult to detect packet existence perfectly. So, in this paper, we evaluate the influence of detection error of packet existence in proposed system by throughput performance.

A New Diversity Reception and Decoding Scheme for Convolutional Encoded Signal Reviewed

W.Z. Wang, T. Yamazato, C. Zheng, H. Okada, M. Katayama, and A. Ogawa

International Symposium on Information Theory and Its Applications (ISITA) Vol. ISITA2000 page： 964-967 2000

Language：English

In this paper, we propose a new diversity reception and decoding scheme for a convolutionally encoded signal. Aiming at obtaining an additional gain by combining diversity reception and decoding technique, we extend notion of space diversity technique to error correction coded signal and consider an iterative decoding. As a result, we have found $2.0$ dB coding gain in 2 path Rayleigh fading channels at BER $=10^{-5}$ after 6 iterations. This reception technique is particularly useful when used in mobile communications.

A Symbol Detection Scheme for OFDM Signals with Subtraction Operation Reviewed

Shibata T.

The Journal of The Institute of Image Information and Television Engineers Vol. 54 ( 12 ) page： 1788 - 1791 2000

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Papers - YAMAZATO Takaya