Decision-feedback channel estimation for turbo-coded MC-CDMA with ICI cancellation
نویسندگان
چکیده
あらまし 高速パケットアクセスが要求される次世代移動無線通信の伝送方式としてマルチキャリア符号分割マ ルチアクセス(MC-CDMA)が注目されている.ハイブリッド自動再送要求(HARQ)と MC-CDMA を併用すれば厳しい 周波数選択性フェージング環境下においても優れたスループット特性を得ることができるものの, マルチコード MC-CDMA では残留コード間干渉(ICI)によって OFDM よりもスループット特性が劣化してしまう.筆者らはこれ まで, 残留 ICI を低減する周波数領域適応干渉キャンセラ(FDAIC)を提案し, FDAIC を MC-CDMA に適用すれば OFDM よりも優れたスループット特性が得られることを明らかにした.しかし, これまでの検討では理想チャネル 推定を仮定しており, チャネル推定を行ったときのスループット特性については未検討であった.そこで本論文で は, FDAIC を用いるターボ符号化マルチコード MC-CDMA HARQ を対象として, 判定帰還チャネル推定を適用した ときのスループット特性を計算機シミュレーションによって求め, OFDM との比較を行っている. キーワード MC-CDMA, 周波数領域適応干渉キャンセラ, HARQ, 判定帰還チャネル推定
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تاریخ انتشار 2007