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Performance of coded DS-CDMA with pilot-assisted channel estimation and linear interference

Abstract—We consider a direct sequence (DS-) code division multiple access (CDMA) system with orthogonally multiplexed pilot signals and minimum mean squared error (MMSE) data and channel estimation. Both flat and frequency-selective fading channels are c

822IEEETRANSACTIONSONCOMMUNICATIONS,VOL.50,NO.5,MAY2002

PerformanceofCodedDS-CDMAWithPilot-AssistedChannelEstimationandLinear

InterferenceSuppression

WayneG.Phoel,Member,IEEE,andMichaelL.Honig,Fellow,IEEE

Abstract—Weconsideradirectsequence(DS-)codedivisionmultipleaccess(CDMA)systemwithorthogonallymultiplexedpilotsignalsandminimummeansquarederror(MMSE)http://doc.xuehai.netrgesystemanalysisisusedtooptimizethepilot-to-datapowerratio(PDR)andthecoderateforafixedbandwidthexpansion.Specifically,thePDRisselectedtominimizetheprobabilityoferrorsubjecttoaconstraintontransmittedpower.WhentheMMSEfilterestimatesthechannelofthedesireduser,butaveragesoverthechannelsoftheinterferers(correspondingtoanadaptivefilterinmoderatetofastfading),theoptimalPDRislessthanthatforthematchedfilter(MF).Thatis,theMMSEfilterbenefitsfromallocatingmorepowertothedata.WhentheMMSEfilterdirectlyincorporatesestimatesofallusers’channelcoefficients,theoptimalPDRisgreaterthanthatfortheMF.Systemperformanceasafunctionofcoderateischaracterizedthroughbothprobabilityoferrorandcutoffrate.TheoptimalcoderatefortheMMSEreceiverisgenerallyhigherthanthatfortheMF,andincreaseswithload

Performance of coded DS-CDMA with pilot-assisted channel estimation and linear interference

Performance of coded DS-CDMA with pilot-assisted channel estimation and linear interference

and

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