Subcarrier Allocation for a 2-Hop OFDMA Virtual Cellular Network
نویسندگان
چکیده
あらまし 次世代移動無線通信システムの実現に向けて,マルチホップバーチャルセルラネットワーク(VCN) が提案されている.筆者らは,直接拡散符号分割多元接続(DS-CDMA)VCN におけるマルチホップチャネル割当 てについて検討してきた.DS-CDMA では,異なる拡散符号を用いることによって VC 内で同一のチャネルを再利 用できるものの,隣接の無線ポート(WP)から処理利得で低減しきれないほどの大きな干渉を受ける場合がある. そこで,本論文では,VCN に直交周波数分割多元接続(OFDMA)を適用する.OFDMA では異なるサブキャリア を割当てることで隣接 WP からの干渉を避けることが可能である.本論文では,下りリンク2ホップ OFDMA VCN におけるチャネル構成法について検討している.ブロック型,等間隔型及び適応型チャネル構成法を用いたときの シャノンのチャネル容量を数値計算手法により求め,それぞれのチャネル構成法を比較する.また,2ホップ VCN とシングルホップ CN との比較を行う. キーワード バーチャルセルラネットワーク,2ホップ,サブキャリア割当て,チャネル構成法,チャネル容量, OFDMA
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تاریخ انتشار 2007