講演抄録/キーワード |
講演名 |
2007-03-15 16:55
上り回線マルチサイト通信システムにおけるサイトダイバーシチ効果に関する一検討 ○松崎圭佑・藤井雅弘・渡辺 裕(宇都宮大) |
抄録 |
(和) |
本稿では,上り回線マルチサイト通信システムにおける選択ダイバーシチと最大比合成ダイバーシチの比較・検討を行う.近年,Radio Over Fiber(ROF)技術を用いたマルチサイト通信システムに注目が集まっている.高周波帯での広帯域伝送が要求される次世代の無線通信システムでは携帯端末の送信信号電力が急激に増加することが考えられる.この問題を解決するためには,セル径の微細化が必要である.従来の上り回線マルチサイト通信システムでは,携帯端末からの受信信号強度から,収容基地局が選択的に決定されている.本稿では,ROF技術を用いて,複数のマイクロ基地局とマクロ基地局を光ファイバで接続し,マクロ基地局で高周波アナログ信号での最大比合成を行う上り回線マルチサイト通信システムを提案する.これにより,所望の通信品質を確保しながら,携帯端末の送信信号電力を削減できると考えられる. |
(英) |
This is a comparative study of the maximum ratio combining diversity and the selection diversity technologies in the up-link multi-site communication systems.The concern with the multi-site communication systems using the Radio Over Fiber (ROF) technology has been growing for the last several years.It is possible to transmit the analog signal on the radio frequency over the optical fiber with less degradation using ROF.In this paper, we assume that the multi-site communication system consists a macro base station and some micro base stations, which is connected by ROF technology each other. The conventional up-link channel makes use of the selection diversity technique that the mobile switching center selects a connected base station with a cell phone based on the received signal power from it. Then, the unselected base stations discard the received signal from the cell phone.In this paper, we propose a method, which the macro base station combines the received signal at all available micro base stations based on the maximum ratio criterion.The proposed method can reduce the transmitted power of each cell phone without a degradation of transmission quality in comparison with the selection diversity. By computer simulations, we compare the proposed method and the conventional method in several cases. The transmitted power using the proposed method is lower than that of the conventional one under the conditions that the transmission quality is a constant value. Especially, the proposed method improves an efficiency of the transmitted power with the increasing number of the base stations. |
キーワード |
(和) |
上り回線マルチサイト通信システム / Radio Over Fiber / 選択ダイバーシチ / 最大比合成ダイバーシチ / / / / |
(英) |
Up-link multi-site communication system / Radio over fiber / Selection diversity / Maximum ratio combining diversity / / / / |
文献情報 |
信学技報, vol. 106, no. 598, WBS2006-63, pp. 35-40, 2007年3月. |
資料番号 |
WBS2006-63 |
発行日 |
2007-03-08 (IT, ISEC, WBS) |
ISSN |
Print edition: ISSN 0913-5685 |
PDFダウンロード |
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