Application of ANFIS Power Control for Downlink CDMA-Based LMDS Systems

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题名:	Application of ANFIS Power Control for Downlink CDMA-Based LMDS Systems
作者:	Lee,ZS;Tsay,MK;Liao,CH
贡献者:	通訊工程研究所
关键词:	INTERCELL RADIO INTERFERENCE;NETWORKS;ACCESS
日期:	2009
上传时间:	2010-06-29 20:12:38 (UTC+8)
出版者:	中央大學
摘要:	Rain attenuation and intercell interference are two crucial factors in the performance of broadband wireless access networks such as local multipoint distribution systems (LMDS) operating at frequencies above 20 GHz. Power control can enhance the performance of downlink CDMA-based LMDS systems by reducing intercell interference under clear sky conditions; however, it may damage system performance under rainy conditions. To ensure robust operation under both clear sky and rainy conditions, we propose a novel power-control scheme which applies an adaptive neuro-fuzzy inference system (ANFIS) for downlink CDMA-based LMDS systems. In the proposed system, the rain rate and the number of users are two inputs of the fuzzy inference system, and output is defined as channel quality, which is applied in the power control scheme to adjust the power control region. Moreover, ITU-R P.530 is employed to estimate the rain attenuation. The influence of the rain rate and the number of users on the distance-based power control (DBPC) scheme is included in the simulation model as the training database. Simulation results indicate that the proposed scheme improves the throughput of the DBPC scheme.
關聯:	ETRI JOURNAL
显示于类别:	[通訊工程研究所] 期刊論文

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