Reduction of the Amount of CSI Feedback in MIMO-OFDM Eigenbeam-Space Division Multiplexing Systems

近年,OFDM (Orthogonal Frequency Division Multiplexing) 方式に関する研究が盛んに行われて おり [1], [2],無線 LAN,地上波ディジタル放送等で利 用されるに至っている.一方,通信容量の増加を目指 して,送受信側に複数のアンテナを設置した MIMO (Multiple-Input Multiple-Output) 空間分割多重通 信も注目を集めている [3]~[5].更に,両者を組み合 わせた MIMO-OFDM 空間分割多重通信システムは IEEE802.11n に採用されると考えられ,研究が進め られている [6]~[9].このMIMO空間分割多重通信に おいて,送信側でチャネル情報 (Channel State Information: CSI)が未知の場合は各送信アンテナから独立 した OFDM信号をそれぞれ等電力で送信する.しか し,送信側でチャネル情報が得られる場合,固有ビー ム空間分割多重 (Eigenbeam-Space Division Multi-

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