Adaptive Prediction Iterative Channel Estimation for OFDM Signal Reception in a Frequency Selective Fading Channel
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چکیده
あらまし 本稿では,OFDM 受信における適応予測繰り返しチャネル推定を提案している.本方式は,繰り返しチャネル推定に適応 予測フィルタを導入して,そのタップ係数を伝搬環境の変化に適応して適応的に更新することに特徴がある.繰り返しチャネル推定の初 回では,周波数多重されているパイロットサブキャリアを用いて1次の内挿と外挿によりチャネル推定し,2 回目以降の繰り返しチャネル推 定では判定帰還,逆変調と適応予測フィルタを用いるチャネル推定を行う.適応予測フィルタのタップ係数の更新には,逆変調によって得 られた瞬時チャネル利得を参照信号とする正規化 LMS アルゴリズムを用いている.計算機シミュレーションにより,周波数選択性フェージ ング環境下でのビット誤り率(BER)特性を評価した.シミュレーション結果より,繰り返しチャネル推定は同じ BER を得るためのパイロットサ ブキャリア数を低減できること,そして適応予測繰り返しチャネル推定は固定タップフィルタを用いる繰り返しチャネル推定より優れた BER 特性を示すことを明らかにした.
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تاریخ انتشار 2003