On the spectral efficiency of wideband CDMA systems

摘要

The reverse-link spectral efficiency is evaluated for andirect-sequence (DS) code division multiple access (CDMA) cellularncommunication system that employs rapid closed-loop power control andncoding with interleaving on channels that exhibit doubly selectivenRician fading. The focus of the paper is the effect of the chip rate ofnthe DS spread-spectrum signal on the spectral efficiency of the system.nPerformance is considered for systems with different numbers ofndemodulators in the RAKE receiver and for systems both with and withoutnantenna diversity. Channels with different delay spectra and Dopplernspreads are used to examine the performance of the system in variousnoperating conditions. The implications of the results for the design ofnwideband CDMA are discussed