研究者詳細 - 冨里　繁

論文 - 冨里　繁

分割表示 49 件中 41 - 49 件目／全件表示 >>

An iterative peak power reduction method with adaptive intermediary over-sampling for wireless OFDMA systems 査読

Kazuhiko Fujimoto, Shigeru Tomisato, Masaharu Hata, and Hiromasa Fujii

電子情報通信学会論文誌EB E94-B ( 2 ) 576 - 579 2011年2月

Experimental study of mobile propagation loss correction formula for a slope terrain area 査読

Takahiro Fujitani, Shigeru Tomisato, Masaharu Hata

IEEE Vehicular Technology Conference 2010年

担当区分：責任著者記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

Service area upgrading and expanding is expected in current and future cellular systems. Since residential areas on a hilly and/or slope terrain are spreading in the outskirts of cities in Japan, the correction for the urban mobile propagation loss formula becomes one of the important issues in radio link and cell layout designs in those areas, especially within 1km distance from a base station. This paper introduces an example of correction formula for the slope terrain area based on an experimental study of mobile path loss prediction. The result shows the path loss at the objective point can be estimated by the urban mobile path loss and the correction value according to the factor expressed by the elevation angle from the base station antenna top. Although the average slope angle is only used as a parameter in the conventional correction for the slope terrain area with at least 5 to 10km length, the result means it is not enough for the correction to the area within 1km distance from a base station. ©2010 IEEE.

DOI： 10.1109/VETECF.2010.5594354

Scopus

researchmap

An adaptive soft clipping method for spectrum sharing OFDMA systems 査読

Toshihisa Fujiwara, Shigeru Tomisato, Masaharu Hata, Hiromasa Fujii, Takahiro Asai, Yukihiko Okumura

Proc. of the 20th IEEE Personal, Indoor and Mobile Radio Communications Symposium, PIMRC 2009 305 - 309 2009年9月

A clipping noise canceller for iterative clipping and filtering in wireless OFDMA systems with nonlinear distortion 査読

Yukari Mori, Shigeru Tomisato, Masaharu Hata, Hiromasa Fujii, Takahiro Asai, Yukihiko Okumura

Proc. of the 12th International Symposium on Wireless Multimedia Communications, WPMC 2009 2009年9月

Experimental study of BWA system applied in an intermediate and mountainous area 査読

Makoto Ono, Yukiji Mikamo, Keisuke Ohtou, Masaharu Hata, Shigeru Tomisato

Proc. CD of the IEEE TENCON 2009 1982 - + 2009年1月

Turbo receiver with SC/Simplified-MMSE (S-MMSE) type equalizer for MIMO channel signal transmission

Hiromasa Fujii, Shigeru Tomisato, Suda Hirohito

IEEE Vehicular Technology Conference 58 ( 1 ) 632 - 636 2003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：Institute of Electrical and Electronics Engineers Inc.

This paper proposes a novel turbo equalization method, called SC/Simplified-MMSE (S-MMSE), for multiple-input multiple-output (MIMO) channel signal transmission. Our method, which deals with residual inter sub stream interference as their average over a frame, achieves excellent error performance at small computational cost. We evaluate our method by link-level and system-level simulations. A complexity comparison is also presented.

DOI： 10.1109/vetecf.2003.1285094

Scopus

researchmap

FPGAを用いて実現したトレリス符号化同一チャネル干渉波キャンセラのリアルタイム室内伝送実験査読

村田英一, 塚本悟司, 冨里繁, 松本正, 吉田進

電子情報通信学会論文誌. B, 通信 84 ( 7 ) 1226 - 1232 2001年7月

記述言語：日本語出版者・発行元：電子情報通信学会

ディジタル移動通信システムの周波数利用効率改善のため，トレリス符号化同一チャネル干渉波キャンセラ(TCC)が提案されている．このTCCはマルチユーザディテクタの一種であり，所望信号と干渉信号の両方を同時に推定する．この際，合成信号点の重なりによる劣化が生じるが，TCCではトレリス符号化変調を用いてこの劣化を改善しており，所望信号と干渉信号の電力が等しい場合にも正しい復号が可能である．本論文では，FPGA (Field Programmable Gate Array)を用いて実現したTCCのリアルタイム室内伝送実験結果を報告する．

CiNii Article

CiNii Books

researchmap

その他リンク： http://hdl.handle.net/10119/4704

A space/time pre-equalization technique for down-link signal transmission in time-division-duplex (TDD) mobile multimedia communications

Shigeru Tomisato, Kazuhiko Fukawa, Tadashi Matsumoto

European Signal Processing Conference 1998- 1998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：European Signal Processing Conference, EUSIPCO

This paper proposes a new spatial and temporal (S/T) pre-equalization technique for time-division-duplex (TDD) mobile multimedia communication systems. Base station (BS) employs an adaptive array antenna (AAA) and an adaptive decision feedback equalizer (DFE) for up-link signal reception. The weight vectors for the up-link AAA and DFE are also used for pre-equalization of signal to be transmitted. With the S/T pre-equalization at the transmitter, the needs for equalizers at mobile station (MS) can be eliminated. In order to evaluate performances of the proposed S/T pre-equalization scheme, this paper uses a detailed propagation model which looks into the mobile propagation mechanism more in detail than conventional multipath models. Performances of the proposed S/T pre-equalizer are then demonstrated through computer simulations. The results show that the proposed scheme is effective in reducing effects of both inter-symbol and cochannel interferences.

Scopus

researchmap

Coherent hybrid DS-FFH CDMA with adaptive interference cancelling for cellular mobile communications

Shigeru Tomisato, Kazuhiko Fukawa, Hiroshi Suzuki

IEICE Transactions on Communications E77-B ( 5 ) 589 - 597 1994年5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：Inst of Electronics, Inf & Commun Engineers of Japan

This paper proposes Coherent-HYBrid Direct-Sequence Fast-Frequency-Hopping (CHYB-DS-FFH) CDMA with Adaptive Interference Cancelling (AIC) for cellular mobile communications. The features of CHYB-DS-FFH are symbol-by-symbol frequency diversity and low chip-rate DS multiplexing
both of which are based on a coherent FFH modulation and demodulation scheme. The combination of coherent FFH, space diversity, and AIC is very effective for reducing the performance degradation due to interference. Computer simulations demonstrate BER performance of a 2 hop 500-kHz-interval frequency hopping system using (i) a linear canceller or (ii) a nonlinear canceller. Both systems employ the two branch space diversity reception of 10 kb/s QPSK with FFH over a 1 MHz system bandwidth. In quasi-static channels, the average BER performance is 10-2 with average Eb/No less than 8 dB. In dynamic fading channels under full interference conditions, CHYB-DS-FFH with the linear adaptive interference canceller realizes a BER of 10-2 at the average Eb/No of 15 dB with maximum Doppler frequency fD of 5 Hz, whereas CHYB-DS-FFH with the non-linear adaptive interference canceller achieves the same BER at the average Eb/No of 15 dB with fD equal to 30 Hz.

Scopus

researchmap

　前のページ - 次のページ　

<冨里 繁>

論文 - 冨里 繁

<冨里　繁>

論文 - 冨里　繁