Single-carrier Frequency-domain Equalization to Achieve Frequency Diversity Gain while Suppressing the Negative Effect of Timing Offset
نویسندگان
چکیده
あらまし シングルキャリア(SC)伝送に最小平均二乗誤差(MMSE)規範に基づく周波数領域等化(FDE)を適用す れば,大きな周波数ダイバーシチ効果が得られ優れた伝送特性を達成できる.しかしながら,受信側で受信タイミ ングオフセットが発生すると符号間干渉(ISI)が発生し,ナイキストフィルタのロールオフファクタが大きくなるに つれ伝送特性が劣化してしまう.これまで筆者らは,MMSE-FDE を用いる SC 伝送における受信タイミングオフセ ットによる伝送特性劣化の発生機構を明らかにし,MMSE-FDE に 2 倍オーバーサンプリングとスペクトル合成を適 用することで受信タイミングオフセットによる特性劣化を救済できることを示してきた.従来の FDE 重みは,スペ クトル合成後の誤差を最小とする重みではないため,十分な周波数ダイバーシチ効果を得ることができなかった. 本論文では,スペクトル合成後の誤差を最小とする FDE 重みによって,タイミングオフセットの影響を救済しつつ より大きな周波数ダイバーシチ効果を得る SC-FDE(ジョイント MMSE-FDE&スペクトル合成)を提案している. キーワード 周波数領域等化,シングルキャリア伝送,ナイキストフィルタ,タイミングオフセット,オーバー サンプリング
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