超宽带(uwb)无线通信系统的同步与解调算法.研究

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1、北京邮电大学博士学位论文英文摘要RESEARCHONSYNCHRONIZATIONANDDEMODULATIONALGORITHMSFORUWBCOⅣ【肌】_NICATIONSSYSTEMSABSTRACTUltra—widebandimpulseradio(UWB—IR)isapromisingtechnologyfordatacom砌nicationsinshort-mngeindoor印plications．Itischarac-terizedbythetransmissionofultra-shortpulse

2、s(inthesub-nanosecondscale)atlowpowerspectraldensi妙InordertokeepthesignalspectmmwithintheFederalCommunicationsCommission(FCC)maskandobtainadequatesignalene玛yforreliabledetection，asin91einfo肌ationsymb01isrepresentedbyseVeralpulses，eachlocatedinitsownfIrame．TbaC-c

3、ommodatemultiple．accessandsmoothtransmitspectmm，pseudoran—domtiming—hoping(TH)spreadcodesor／anddirect—sequence(DS)spI．eadcodesar．eoRenemployed．InterestinUWBismotiVatedbyseV—eralfeaturesincluding：amplemultipathdiVersi劬10w—complexi够base—bandtransceiVers，apotential

4、lyla唱euserc印aci吼andpotentialtooVe卜layeXistingnan．owbandsystems．Tohamessmesebenefits，howeVer'Ir、ⅣB—IRfacesseveralchallenges，锄ongwhichsyIlchronizationanddemodulationareparticularlycriticalatthereceiVerend．Synchronizationisape墒mance—criticalfactorinmostcommuni—cati

5、onsystems，especiallyinUWBtransmission．Itstems厅omthefactthatthe乜ansmittedpulsesareVe叫narrowandhaVelowpower．TheV北京邮电大学博士学位论文英文摘要densemultipattlchamlel，tk．oughwhichthepulsesbearinginfo咖ationpropagate，isummownatthereceiVerduringthesynchronizationphase．Moreover，thebi

6、terrorrate(BEIUofUWBisveWsensitiVi妙tomistim-ing，thetimingerrorsassmallasfhctionsofananosecondcans舐ouslyde伊adethesystempe而彻ance．Tocopewiththesechallenges，anumberofsynchroIlizationanddemodulationalgorithmshavebeenproposedinthisdissertation．Summanzedasfollows：Relyi

7、ngonthepriorknowledgeoftheDScodes，anon-dataaidedsynchronizationalgorithmisproposedforDS-UWBsystems．ItremainsoperationalinpracticalU、^厂Bsettingswithunknownmultipathpropaga—tion．Wimtheaidoftheinte伊ate—and·dump(I&D)oVerafhmedurationandpeak．picbng行omtheoutputoftheDS

8、codesmatchingfilter，theproposedapproachcanachieVefhme-leVeltimingacquisitionwithinonesymbolduration．Themaximumsignificantlydi腩rs舶motherValuesduetothepseudorandomprope