研究者詳細 - 山里　敬也

論文 - 山里　敬也

分割表示 1,501 件中 1,361 - 1,380 件目／全件表示 >>

A new M-ary/SSMA scheme applicable in LEO satellite communication systems 査読有り

Wada T, Yamazato T, Katayama M, Ogawa A

IEEE GLOBECOM 1996 - CONFERENCE RECORD, VOLS 1-3 頁： 384 - 389 1996年

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

Niwa H, Katayama M, Yamazato T, Ogawa A, Isaka N

IEEE ISSSTA '96 - IEEE FOURTH INTERNATIONAL SYMPOSIUM ON SPREAD SPECTRUM TECHNIQUES & APPLICATIONS, PROCEEDINGS, VOLS 1-3 頁： 816 - 820 1996年

DS/SS/GMSK with differential detection over multipath Rayleigh fading channels 査読有り

Wakaki I, Ishiguro T, Yamazato T, Katayama M, Ogawa A

IEEE ISSSTA '96 - IEEE FOURTH INTERNATIONAL SYMPOSIUM ON SPREAD SPECTRUM TECHNIQUES & APPLICATIONS, PROCEEDINGS, VOLS 1-3 頁： 399 - 403 1996年

Performance degradation due to the access timing delay on CDMA unslotted ALOHA with channel load sensing 査読有り

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

ICUPC '96 - 1996 5TH IEEE INTERNATIONAL CONFERENCE ON UNIVERSAL PERSONAL COMMUNICATIONS RECORD, VOLS 1 AND 2 頁： 111 - 114 1996年

Performance of bit-by-bit interleaved trellis coded 16DAPSK on Rayleigh fading channel 査読有り

Yamazato T, Nakagawa H, Katayama M, Ogawa A

ICUPC '96 - 1996 5TH IEEE INTERNATIONAL CONFERENCE ON UNIVERSAL PERSONAL COMMUNICATIONS RECORD, VOLS 1 AND 2 頁： 543 - 547 1996年

Performance evaluation of CDMA ALOHA systems with modified channel load sensing protocol 査読有り

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

IEEE GLOBECOM 1996 - CONFERENCE RECORD, VOLS 1-3 頁： 1291 - 1295 1996年

The DS/CDMA system using transmission diversity for indoor wireless communications 査読有り

Ban K, Katayama M, Yamazato T, Ogawa A

PIMRC'96 - THE SEVENTH IEEE INTERNATIONAL SYMPOSIUM ON PERSONAL, INDOOR AND MOBILE RADIO COMMUNICATIONS, PROCEEDINGS, VOLS 1-3 頁： 808 - 812 1996年

Throughput performance improvement of spread-slotted Aloha in mobile satellite communications 査読有り

Jamalipour A, Katayama M, Yamazato T, Ogawa A

1996 IEEE INTERNATIONAL CONFERENCE ON COMMUNICATIONS - CONVERGING TECHNOLOGIES FOR TOMORROW'S APPLICATIONS, VOLS. 1-3 頁： 1740 - 1744 1996年

Throughput improvement of CDMA slotted aloha system by modified channel load sensing protocol 査読有り

Saito M, Okada H, Sato T, Yamazato T, Katayama R, Ogawa A

PIMRC'96 - THE SEVENTH IEEE INTERNATIONAL SYMPOSIUM ON PERSONAL, INDOOR AND MOBILE RADIO COMMUNICATIONS, PROCEEDINGS, VOLS 1-3 頁： 103 - 107 1996年

The receiver with an adaptive array antenna and satellite diversity for low earth-orbital multiple satellite communication systems 査読有り

Sumino H, Katayama M, Yamazato T, Ogawa A

MOBILE AND PERSONAL SATELLITE COMMUNICATIONS 2 頁： 180 - 194 1996年

The performance of CDMA system using pi/4-shift QPSK and pi/2-shift BPSK with the nonlinearity of HPA 査読有り

Kashyap K, Wada T, Katayama M, Yamazato T, Ogawa A

PIMRC'96 - THE SEVENTH IEEE INTERNATIONAL SYMPOSIUM ON PERSONAL, INDOOR AND MOBILE RADIO COMMUNICATIONS, PROCEEDINGS, VOLS 1-3 頁： 492 - 496 1996年

A modified power control scheme for remedying the effects of traffic nonuniformity in LEO satellite communications systems 査読有り

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

International Journal of Wireless Information Networks 3 巻 ( 1 ) 頁： 29 - 39 1996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：International Journal of Wireless Information Networks

It has been shown in our previous studies that the geographical traffic nonuniformity considerably affects the performance of the low earth orbit satellite communications systems. In this paper, a new scheme for improving the throughput characteristics of these systems at nonuniform traffic distribution is proposed. In this method, some parts of the users under the satellite which is flying over the area with high traffic load are assigned to its neighbor satellites with lower transmitting power levels. It is shown that the method equalizes the traffic loads of the satellites to some degree and, hence, can improve the throughput characteristics of the system. © 1996 Plenum Publishing Corporation.

DOI： 10.1007/BF02106660

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A new M-ary/SSMA scheme applicable in LEO satellite communication systems 査読有り

T Wada, T Yamazato, M Katayama, A Ogawa

IEEE GLOBECOM 1996 - CONFERENCE RECORD, VOLS 1-3 頁： 384 - 389 1996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：I E E E

In this paper, we discuss a non-coherent reception of M-ary spread-spectrum multiple-access (M-ary/SSMA) signals in the presence of large Doppler frequency shift.
The Hadamard Codes (H-codes) is applied as orthogonal codes. The influence of Doppler frequency shift has a particular characteristic according to the property of H-codes. Making use of this property, we, first, propose an initial carrier frequency acquisition method which can estimate the value of large Doppler frequency shift. We, then, proposed a M-ary/SSMA scheme that is based on the simultaneous transmission of two distinctive H-codes.

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Adaptive transmit permission control on spreadslotted aloha packets applicable in leos systems 査読有り

Jamalipouri A., Katayamat M., Yamazato T., Ogawai A.

IEICE Transactions on Communications E79-B 巻 ( 3 ) 頁： 257 - 264 1996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

A new transmit permission control scheme applicable in multi-cell communication systems is proposed. In this scheme, by prohibiting the transmissions from the users with relatively high propagation loss to their connecting hub stations, level of multiple access interference is decreased, and hence throughput characteristics are improved. Moreover, we continue our discussion to propose two adaptive forms of the transmit permission control scheme, in which the prohibition condition becomes more intelligent by considering the level of the offered traffic loads to hub stations. These methods are utilized in a slotted Aloha random transmission of the spread spectrum packets, and on the uplinks of a low earth orbit satellite communication system as an example of the multi-cell systems. It is shown that the adaptive schemes exhibits significantly improved characteristics at all offered traffic loads in these systems.

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

H Niwa, M Katayama, T Yamazato, A Ogawa, N Isaka

IEEE ISSSTA '96 - IEEE FOURTH INTERNATIONAL SYMPOSIUM ON SPREAD SPECTRUM TECHNIQUES & APPLICATIONS, PROCEEDINGS, VOLS 1-3 頁： 816 - 820 1996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：I E E E

Many electric appliances using power lines for their power supply often tend to emit larger noise to the lines when the absolute instantaneous voltage of the power-supplying AC is higher. Thus, total noise on the lines has positive relation to the AC voltage. In this paper, We first model the noise to be cyclic stationary Gaussian with the instantaneous power (variance) proportional to the n-th power of the absolute instantaneous voltage of the AC. Considering this statistical feature of the noise, we also propose a power-line communication system and show its performance. The proposed system employs two processing gains: the smaller ope for the period with lower AC voltage and the larger for the rest period.

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修正チャネルロードセンシングプロトコルを用いたSpread Slotted ALOHA方式のスループット特性

齋藤将人, 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 SAT95 巻 ( 83 ) 頁： 67-72 1995年12月

Throughput analysis of spread-slotted ALOHA in LEO satellite communication systems with nonuniform traffic distribution 査読有り

Jamalipour A, Katayama M, Yamazato T, Ogawa A

IEICE TRANSACTIONS ON COMMUNICATIONS E78B 巻 ( 12 ) 頁： 1657 - 1665 1995年12月

擬似ランダム系列を利用したM-ary/SS通信方式の搬送波周波数偏差存在下での受信特性について

和田忠浩, 山里敬也, 片山正昭, 小川明

第18回情報理論とその応用シンポジウム SITA95 巻 ( C-6-3 ) 頁： 597-600 1995年10月

Adaptive Transmission Control Scheme for Spread-Slotted Aloha Mobile Satellite Communication Systems

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

第18回情報理論とその応用シンポジウム SITA95 巻 ( C-8-4 ) 頁： 777-780 1995年10月

陸上移動体通信におけるビットインターリーバを用いたトレリス符号化16DAPSKの特性

中川仁志, 山里敬也, 片山正昭, 小川明

第18回情報理論とその応用シンポジウム SITA95 巻 ( D-3-1 ) 頁： 297-300 1995年10月

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