智能算法在MCCDMA系统多用户检测中应用研究

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1、西南交通大学硕士学位论文智能算法在MC-CDMA系统多用户检测中应用研究姓名：董志诚申请学位级别：硕士专业：通信与信息系统指导教师：张翠芳20080501西南交通大学硕士研究生学位论文第1I页AbstractMultiuserdetection(MUD)problemCallbeviewedasacombinationalop"tnnizationproblem．Intelligencecomputationhasshownmanyadvantagesoverconventionaloptimi

2、zationalgorithm．，nlisthesisisdedicatedtotheapplicationofIntelligencecomputationMUDtoantenna-diversityassistedMC-CDMAsystems．皿1emainworksofthispapercanbesummarizedasfollows：1．AnalyzedprincipleofMC-CDMAsystem,establishedthemathematicmodeltransmissionan

3、dreceptionforMC-CDMAsystemunderthegausschannelandtheRayleighchannel．2．Severalcommonlyusedsuboptimalmultiuscrdetectorsar弓described。Lastly,thesimulationresultsofthesesuboptimaldetectorsaregiv饥3．Agenetic-Simulated-Annealingalgorithm(G舢assistedmultiuserd

4、etection(MUD)isproposedfortheantenna-diversity-aidedmulticarriercode-divisionmultiple-access(MC-CDMA)sysmminfrequency-selectivefadingchannel．TwokindsofGA-basedindividual-selectionstrategiesareinvestigatedwithtwodifferentcostfunctions，whicharelog-like

5、lihoodfunction(LLF)andsquarephaseerror9respectively．Simulationanalysisshowsthat：withthesameindividual-selectionslrategy,thebitelTorrate(BER)pI既fb：m蝴ofthephaseerrorcostfunctionisbetterthanlog-likelihoodfunction．Withthesamecostfunction,theindividual-se

6、lectionslrategybased011Paretooptimalitycriterionhasbetterperformancethanthelinearcombingcriteriom4．Aimprovedartificialfish8wanllalgorithm(AFSA)assistedmulti-userdetection(MUD)isproposedforthen，c咖antennadiversityaidedmulti-carriercode-divisionmultiple

7、-access(MC-CDMA)systemsinfrequency-selectivefadingchannel．11leindividualsassociatedwiththe鹏AareselectedbasedontheconceptofParetooptimality,whichusestheinformationfromtheantennasindependently．Simulationresultsshowedthat：、析111thesimilarcostfunction,the

8、strategyofAFSA．M【JDhasmuchbetterbitelTorrate(BER)performancethantheGA小仉JD．5．Agenetic-Simulated-Annealingalgorithm(G舢assistedmultiuser西南交通大学硕士研究生学位论文第1Ⅱ页detection(MUD)isproposedforthesingleantennawithtwodifferentcostfunctionsaidedmulticarriercode-divi