Study on Channel Estimation for Single-carrier Frequency-domain Equalization using Frequency-domain Transmit Filtering
نویسندگان
چکیده
あらまし ルートナイキスト送信フィルタを用いるシングルキャリア(SC)伝送では,ロールオフファクタを大き くすることにより,送信信号のピーク対平均電力比(PAPR)を小さくすることができる.さらに,最小平均二乗誤差 規範に基づく周波数領域等化(MMSE-FDE)によって,大きな周波数ダイバーシチ効果を得ることができる.筆者ら は,ロールオフファクタの増加に伴う信号帯域の広がりを利用して,より大きな周波数ダイバーシチ効果を得られ るジョイント MMSE-FDE ・ スペクトル合成を提案し,ロールオフファクタを大きくすることでより優れたビット 誤り率特性を得られることを示してきた.ジョイント MMSE-FDE・スペクトル合成では高精度なチャネル推定が必 要であるが,パイロット信号のみを用いたチャネル推定では送信フィルタリングを用いると理想チャネル推定時か らの特性差が大きい.そこで本稿では,ルートナイキスト送信フィルタリングを用いる SC 伝送において,判定帰 還を用いたチャネル推定の適用効果を計算機シミュレーションにより明らかにしている. キーワード 周波数領域等化,シングルキャリア伝送,送信フィルタリング,チャネル推定
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