Effect of Transmit Power Control on Frequency Efficiency of Distributed Antenna Network using Maximal Ratio Diversity Transmission
نویسندگان
چکیده
あらまし 移動無線通信では,フェージング,シャドウイングや伝搬損失によって受信レベルが変動するため品 質劣化が発生する.一つの基地局に多数の送受信アンテナを集中させるよりも,それらをセル内に分散配置するこ とにより品質劣化を軽減できる.これまで,筆者らは,周波数分割多元接続(FDMA)セルラー環境でのマルチセル 下りリンクを対象に最大比送信(MRT)ダイバーシチを用いる分散アンテナネットワーク(DAN)について検討し,送 信ダイバーシチに参加するアンテナ数を増加させるとダイバーシチ効果が増大し,周波数利用効率が向上すること を示してきた.しかし,送信ダイバーシチを用いてもフェージング,シャドウイングや伝搬損失による受信電力の 変動が残留する.これを抑圧する技術に送信電力制御(TPC)がある.DAN に TPC を導入した時の周波数利用効率に ついては筆者らの知る限り,これまで検討が行われていない.本論文では,最大比送信を用いるセルラーDAN の下 りリンク周波数利用効率に及ぼす送信電力制御の影響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 分散アンテナネットワーク,最大比送信ダイバーシチ,送信電力制御,周波数利用効率
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تاریخ انتشار 2008