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1、北京交通大学硕士学位论文垂直空时分层多载波CDMA系统信号处理技术的研究姓名:杨薇申请学位级别:硕士专业:通信与信息系统指导教师:杨维20061201ABSTRACTCDMAisoneofthemostimportanttechnologiesinthethirdmobilecommunicationsystems,andMulticatriermodulationwillbecomethemaintechnologyinthebroadbandwidthwirelessIransmissionsystemsbecausoitpfo“d鹦alleffec
2、tivemethodoftransnfiRmghigh-ratedatainbadwirele∞communicationenvironment.Moreover,multi-inlmtmulti_oUtlmtOvf蹦o)sch黜eisthekeytechnologywhichc址improvetheperformancc,capacityandspectrumefficiencyofthecommunicationsystems.VerticalBellLaboratoriesLayeredSpace-TimeCv=-BLASllarchitectur
3、ewillalsobecomeasignificantapproachtoachievinghighdatarateandtransmissionquality.ThecombinationofCodeDivisionMultipleAccess(CDMA),Mulficarri臂modulationandMIMO、,mLASTcangreatlyimprovesystemperformanceandflllfilltherequirementoffuturemobilecommunication.ThedissertationsfocusOntheov
4、erallanalysisofspace-timeprocessingtechniqueforuplinkmulticarriorCDMAsystemswithV二BLASTarchitect啪e.11璩dissertationplacestheemphasisonsystematicalresearchof%BLAST位msmitterandzero-forcing(zF)receiverstructure嬲wellastheperformanceofthreekindsofuplinkmulticarrierCDMAsystem,whichareMI
5、MeMC-CDMAsystem,MmIoMC—DS-CDMAsystemandMIMO^n℃DMAsystem.Weproposethreekindsofl'eceiverstructureandsignalcombinationstrategy,analyzetheirtheoreticalperf,,mmce.InMIMOMC-CDMA,thereceivedsignalsaleachsubcarriersaledetectedbyZFV二BLASTdetectorsandthencombinedinthefzequencydomain,80thei
6、nterferenceCanbereducedinthecombiner,andthediversitygainincludesbotllspacediversitygainand序eq嘣mcydiversity弛Butwiththeflatfadingchannels,thediversitye,mofM/MOMC-DS—CDMAisprovidedbyspacediversityonly.MIMeMT-CDMAsystemexperiencesfrequency-selectivefadingchannels,anditsdiversitygaini
7、scomposedofspacediversity髻IiIlandpathdiversity弛Theresultsshowthatthecombinedsignalprocessinginspace,timeand丘烈l碾札cycansuppl'q黜qinterference,getspace,timeandffequencygainanddramaticallyimprovethesystemperformance,capacity,servicequalityandspectrumefficiencywhenthenumberoftransmitte
8、rissmallorthenumberofreceiverislarge.1ka