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

NCUIR > College of Electrical Engineering & Computer Science > Graduate Institute of Communication Engineering > journal & Dissertation > Item 987654321/29072

Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/29072

Title:	Application of ANFIS Power Control for Downlink CDMA-Based LMDS Systems
Authors:	Lee,ZS;Tsay,MK;Liao,CH
Contributors:	通訊工程研究所
Keywords:	INTERCELL RADIO INTERFERENCE;NETWORKS;ACCESS
Date:	2009
Issue Date:	2010-06-29 20:12:38 (UTC+8)
Publisher:	中央大學
Abstract:	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.
Relation:	ETRI JOURNAL
Appears in Collections:	[Graduate Institute of Communication Engineering] journal & Dissertation

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