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《超寬帶(uwb)無(wú)線通信系統(tǒng)的同步與解調(diào)算法.研究》由會(huì)員上傳分享，免費(fèi)在線閱讀，更多相關(guān)內(nèi)容在應(yīng)用文檔-天天文庫(kù)。
1、北京郵電大學(xué)博士學(xué)位論文英文摘要RESEARCHONSYNCHRONIZATIONANDDEMODULATIONALGORITHMSFORUWBCOⅣ【肌】_NICATIONSSYSTEMSABSTRACTUltra—widebandimpulseradio(UWB—IR)isapromisingtechnologyfordatacom砌nicationsinshort-mngeindoor印plications．Itischarac-terizedbythetransmissionofultra-shortpulse
2、s(inthesub-nanosecondscale)atlowpowerspectraldensi妙I(lǐng)nordertokeepthesignalspectmmwithintheFederalCommunicationsCommission(FCC)maskandobtainadequatesignalene瑪yforreliabledetection，asin91einfo肌ationsymb01isrepresentedbyseVeralpulses，eachlocatedinitsownfIrame．TbaC-c
3、ommodatemultiple．a(chǎn)ccessandsmoothtransmitspectmm，pseudoran—domtiming—hoping(TH)spreadcodesor／anddirect—sequence(DS)spI．eadcodesar．eoRenemployed．InterestinUWBismotiVatedbyseV—eralfeaturesincluding：amplemultipathdiVersi劬10w—complexi夠base—bandtransceiVers，apotential
4、lyla唱euserc印aci吼andpotentialtooVe卜layeXistingnan．owbandsystems．Tohamessmesebenefits，howeVer'Ir、ⅣB—IRfacesseveralchallenges，鋤ongwhichsyIlchronizationanddemodulationareparticularlycriticalatthereceiVerend．Synchronizationisape墑mance—criticalfactorinmostcommuni—cati
5、onsystems，especiallyinUWBtransmission．Itstems廳omthefactthatthe乜ansmittedpulsesareVe叫narrowandhaVelowpower．TheV北京郵電大學(xué)博士學(xué)位論文英文摘要densemultipattlchamlel，tk．oughwhichthepulsesbearinginfo咖ationpropagate，isummownatthereceiVerduringthesynchronizationphase．Moreover，thebi
6、terrorrate(BEIUofUWBisveWsensitiVi妙tomistim-ing，thetimingerrorsassmallasfhctionsofananosecondcans舐ouslyde伊adethesystempe而徹ance．Tocopewiththesechallenges，anumberofsynchroIlizationanddemodulationalgorithmshavebeenproposedinthisdissertation．Summanzedasfollows：Relyi
7、ngonthepriorknowledgeoftheDScodes，anon-dataaidedsynchronizationalgorithmisproposedforDS-UWBsystems．ItremainsoperationalinpracticalU、^廠Bsettingswithunknownmultipathpropaga—tion．Wimtheaidoftheinte伊ate—and·dump(I&D)oVerafhmedurationandpeak．picbng行omtheoutputoftheDS
8、codesmatchingfilter，theproposedapproachcanachieVefhme-leVeltimingacquisitionwithinonesymbolduration．Themaximumsignificantlydi腩rs舶motherValuesduetothepseudorandomprope
