Sophisticated Channel Estimation for Single-Carrier Space-Time Block Coded Time-Division Duplex Transmission with Multi-Block FDE
نویسندگان
چکیده
あらまし これまでに我々は,周波数領域時空間符号化(FD-STBC)を用いるシングルキャリア(SC)時分割複 信(TDD)伝送のためのマルチブロック周波数領域等化(MB-FDE)を提案し,チャネル推定が理想的なとき高速 フェージング環境下で優れた伝送特性を有することを明らかにした.しかしながら,チャネル推定誤差が存在する 場合には MB-FDE の特性改善効果が低下してしまうという問題点があった.そこで本稿では,最小平均二乗誤差 (MMSE)規範に基づいて複数の 2 次元フィルタを同時に最適化することで,MIMO チャネルの推定と時間変動予 測と同時に実現する適応 2 次元 MIMO チャネル推定を提案する.データ判定後の軟判定データブロックをパイロッ トとして用いる繰り返し処理を組み合わせることによってさらに高い時間追従性を実現できる.繰り返し適応 2 次 元チャネル推定を MB-FDE を用いる SC-STBC TDD 伝送に適用したときの平均ビット誤り率(BER)特性を計算機 シミュレーションにより求め,繰り返し適応 2 次元チャネル推定の有効性を示す. キーワード チャネル推定,時空間符号化,高速フェージング
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