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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
