講演名 2009-06-26
Transparent Inband Feedback for Training-Based MIMO Systems
スイヒリ ウサマ, 大槻 知明,
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抄録(和)
抄録(英) Recently, Echo-MIMO, a delay-free feedback scheme has been proposed for Closed-Loop MIMO systems, where the receiver echoes the received signal on the fly to the transmitter without any processing. While this reduced feedback latency allows for more use of the channel's coherence time for data transmission, it comes at high power-and-bandwidth costs, as two MIMO transmissions are required in the feedback phase. In this report, we present a feedback scheme that preserves the advantages of Echo-MIMO while requiring only one feedback transmission. The echoed signals are judiciously combined with the receiver's signals such that their separation at the transmitter be lossless, and that no extra transmit power nor band-width be required. In addition, we highlight the estimation accuracy degradation in Echo-MIMO owing to the echoed noise, and analytically confirm the intuition that removing the noise prior to echoing the received signal provides better estimation than echoing the noisy received signal as is and later account for the noise effect upon echo reception. Simulation results show that the proposed scheme outperforms Echo-MIMO in terms of channel estimation accuracy and achievable capacity of up to 5dB and 10bit/sec/Hz, respectively.
キーワード(和)
キーワード(英) Closed-Loop MIMO / channel estimation / CSI feedback / Rayleigh fading
資料番号 RCS2009-51
発行日

研究会情報
研究会 RCS
開催期間 2009/6/18(から1日開催)
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講演論文情報詳細
申込み研究会 Radio Communication Systems (RCS)
本文の言語 ENG
タイトル(和)
サブタイトル(和)
タイトル(英) Transparent Inband Feedback for Training-Based MIMO Systems
サブタイトル(和)
キーワード(1)(和/英) / Closed-Loop MIMO
第 1 著者 氏名(和/英) スイヒリ ウサマ / Oussama SOUIHLI
第 1 著者 所属(和/英) 慶應義塾大学大学院理工学部
Department of Information and Computer Sciences, Keio University
第 2 著者 氏名(和/英) 大槻 知明 / Tomoaki OHTSUKI
第 2 著者 所属(和/英) 慶應義塾大学大学院理工学部
Department of Information and Computer Sciences, Keio University
発表年月日 2009-06-26
資料番号 RCS2009-51
巻番号(vol) vol.109
号番号(no) 105
ページ範囲 pp.-
ページ数 6
発行日