Transmit Power Reduction of Distributed Antenna Network for Downlink Transmissions Using Joint Transmit/Receive Diversity
نویسندگان
چکیده
あらまし 多数のアンテナを基地局の周辺に分散配置する分散アンテナネットワーク(DAN)は,移動端末近傍の複数の分散 アンテナを用いることで伝搬損失による局所平均受信電力の低下を軽減できるだけでなく,空間ダイバーシチ効果によりシャド ウイングおよび周波数選択性フェージングの影響を救済できる.筆者らはこれまで,シングルキャリア(SC-)DAN における周波 数領域時空間符号化送受信ダイバーシチ(FD-STBC-JTRD)について検討し,FD-STBC-JTRD に用いる分散アンテナ数を増加させ るにつれスループット特性を大幅に改善できることを明らかにした.本稿では,アンテナが基地局に集中している従来のセルラ ーネットワーク(集中アンテナネットワーク(CAN)と呼ぶ)と SC-DAN との比較を行っている.FD-STBC-JTRD を用いる SC-DAN と SC-CAN の下りリンクスループットの空間分布を計算機シミュレーションにより求め,SC-CAN に比べて SC-DAN が所要送 信電力を大幅に低減できることを示している. キーワード 分散アンテナ,時空間符号化,周波数領域送信等化,HARQ
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