基于混沌压缩感知的cs-dcsk uwb无线通信系统的研究

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1、摘要11万方数据厦门大学硕士学位论文AbstractUltra-wideband(UWB)wirelesscommunicationsystemshavelotsofadvantagesininformationtransmissionrate，anti-multipathfadingandreutilizationoffrequencyspectmmresource．Withitsinherentwide-bandpropertyande缴togenerate，chaoticsignalhasnaturallybeenusedinUWBwi

2、relesscommunicationsystems．ChaoticUWBsystemsusechaoticdigitalmodulationtechnologies，whichutilizeschaoticsignalsascarriers，totransmitinformation，andthesystemshavedemonstratedtheiradvantagesincost,powerconsBmeandanti—interference．Amongallthechaoticdigitalmodulationtechnologie

3、s，Code—ShiftedDifferentialChaosShiftKeyinghasdrewmuchattentionrecentyearsandbeenusedinUWBsystems．Nyquistsamplinglawplaysanimportantroleindigitalsignalprocessing,andtakesanindeh'bleeffectintheprogressofscienceandtechnology．Withtheincreaseofdesireofhumanbeingsonlargedataandhi

4、ghcommunicationrate，thebandofsignalhasbeenincreasingHowever,accordingtothetraditionalNyquistsamplinglaw,thesamplingrateofchaoticUWBsystemswillbeextremelyhishwhichwillgiveheavypressuretoanalog-to—digitalconvertor(ADC)ofreceiversideontechnicalrealization，costandpowerconsume．T

5、hisproblemwillbeabarrieronthefunctionizationofwell-performedchaoticUWBsystems．Theemergeofcompressedsensingbringsarevolutioninsignalprocessingfield．Sub-NyquistreceiversbasedontheideaofcompressedsensinghasbeenprovedtobefeaslSleinotherwide-bandcommunicationareas．Asaresult,expl

6、oringthecombinationofchaoticUWBsystemandcompressedsensingwillmaketheadvantagesofchaoticUWBsystembeenfurtherused．Firstly,thispaperwillanalyzethedoublesparsityofCS-DCSKbasedchaoticUWBsystem，thenwewillredesignthetraditionalCS-DCSKreceiverbasedonthestructureofitsWalshcodes．Ther

7、edesignofitwillmakeitsimplerandfitfortheideaofcompressedsensingreceiver．Wethenprovetheequalityinbiterrorrate(BER)performanceofthenewreceiverandthetraditionaloneOVerAWGNchannels．Inaddition，weanalyzetheBERperformanceofthenewreceiverOVerUWBchannel．TⅡ万方数据AbstractSecondly,basedO

8、IltheredesignedCS·DCSKreceiverabove，weproposetwosub-NyquistreceiversforCS-DCSKUWBs