光纤ofdm舆系统同步算法分析

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1、Optical助erchaIlnel0FDMsystemsgenerallyhaVeaVeryhi曲traJlsmissionrate．TheexistenceoffiberchaJlnelnonline撕tyanditsintricateinteractionwithfiberdispersion，whichisnonexistentinthewirelesssystems，leadtotheuncertaintyofsyncllronizationof00FDMsystems．Thusitisnecessa巧todeVelopasy

2、nchronizationmethodwithexcellentperfomlanceandlowcomputationalcomplexit)，suitableforOOFDMsystem．Accordingtodifferentsystemstmcture，someOOFDMsystemsonlyneedtimingsynchrollization，whileothersneedtimingsynchronizationand仔equencysynch‘onization．BaSedonthedi行erentstmcturesof0

3、0FDMsystems，wediscussedsynchronizationalgorithmsindirectdetection00FDM(DD一00FDM)systemandcoherentoptical0FDM(C0一OFDM)system．Thei11110VationworksareaSfollows：1．Anintensit)，modulation(IM)DD一00FDMexperimentalsystembasedonstandardsingle．modeoptical肋er(SSMF)isestablished．Weco

4、mparedthree够picaltimingsynchrolliZationalgorimmsmwirelesschannel．ThenaJlimproVedtimingsynchronizationalgorithIIlbaSedontrainjngsequenceisproposed．SimulationaIldexperimentalresultsshowthattheproposedalgorithmcanachieVeh追hertimingsynchronizationaccuracyandacquisitionprob乏L

5、bilitywhenthereceiVingpowerislow．2．ThesynchrollizationtectulologyofCO一0FDMsystemsisstudied．WeanalyzedtheprincipleoffrequencysyncllroniZationofSchmidlalgorithminC0—0FDMsystems．BaSedontllisalgoriⅡ1m，weproposedanimproVedone—training—symboljointtimingand厅equencysyllchrolliza

6、tionalgorithIn．111esimulationplatfonnofCO一0FDMsystemisconstmcted，andthenusedtoverifythepmposedalgorimm．Simulationresultsdemonstratethatt11epmposed光纤0FDM传输系统同步算法研究algorithmⅥ，hichrequires011lyonetrainingsequencecanobtainbettersynchronizationpeffIo咖aJlce，reducemesystem’sred

7、undancyandimproVethetraJlsmissionemciency．KeyWords：0pticalconmlunication；0Ithogonal行equencydiVisionmultiplexing(0FDM)；Directdetection；Timingsynchronization；Coherentoptical0FDM；FrequencysyncIlronization；T

8、ainingsequenceIV1．3．10FDM技术⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯．41．3．2光纤传输0FD

9、M技术发展状况⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯41．3．3OOFDM系统同步技术研究现状⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯．．61．4论文结构及主要内容⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯7