PERFORMANCE EVALUATION OF RAKE RECEIVER WITH ADAPTIVE CHANNEL ESTIMATION FOR IMT-DS SYSTEM

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" PERFORMANCE EVALUATION OF RAKE RECEIVER WITH ADAPTIVE CHANNEL ESTIMATION FOR IMT-DS SYSTEM "

Document Type	:	Latin Dissertation
Language of Document	:	English
Record Number	:	151200
Doc. No	:	ET22992
Main Entry	:	SYED FAISAL ALI SHAH
Title Proper	:	PERFORMANCE EVALUATION OF RAKE RECEIVER WITH ADAPTIVE CHANNEL ESTIMATION FOR IMT-DS SYSTEM
Note	:	This document is digital این مدرک بصورت الکترونیکی می باشد
Abstract	:	Rake receiver is generally used in direct sequence code division multiple access (DS-CDMA) systems to exploit the multipath diversity. In order to achieve an acceptablequality of service, a good estimator for channel taps i s usually needed. The aim ofthis thesis is to investigate the performance of Rake receiver with adaptive channelestimation for IMT-DS system-a 3G mobile communication standard. Detail re-sults of channel estimation for this system are not yet available in the literature.In this thesis, a new dimension in the channel estimation for wideband CDMA i-e.chip-level adaptive channel estimation has been explored. Simple LMS algorithm iswed to update the weights of the adaptive filter because of its simplicity and suit-ability for this problem. The expression for the optimum step-size i s modified forfading channel estimation problem. Simulation results for optimum step-size LMSalgorithm show better performance as compared to arbitrary selected step-size. Inaddition, a new method is proposed to obtain channel estimates with known pilotsymbols which is found to give better results than available methods. For slow fadingchannels, like pedestrian channel, LMS estimator with no update mode is found togive satisfactory results. For fast fading channels, like vehicular channel, a commondecision directed technique of channel estimation is modified-....,....-...,..tested for theQ1 PC1 bus cardBoth these projects mere sofixare des elopment efforts tonards contributing to dlfferentaspects of Roboucs and lZ1echatronics projects m the Controls and Roboucs Group..
Subject	:	Electericl tess
	:	برق
electronic file name	:	TL46221.pdf
Title and statement of responsibility and	:	PERFORMANCE EVALUATION OF RAKE RECEIVER WITH ADAPTIVE CHANNEL ESTIMATION FOR IMT-DS SYSTEM [Thesis]