光纖OFDM輿系統(tǒng)同步算法研究.pdf

1、湖南大學碩士學位論文光纖OFDM輿系統(tǒng)同步算法研究姓名：狄煦申請學位級別：碩士專業(yè)：信息與通信工程指導教師：陳林20120512碩士學位論文AbstractW鉑1therapiddevelopmentofcommunicationtechnologypeoplebecomemoreurgenttocommunicationqualitydemandHowtealizeinformation刪ssionwithhighspeedlarge

2、capacityandhighqualityatlimitedbandwidthdrawsgreatattentionofresearchersAsanimportantmodulationtechnique，opticalorthogonalfrequencydivisionmultiplexing(OOFDM)withhi；ghspectralefficiencyandhightoleranceoffiberdispersionan

3、dpolarizationmodedispersion(PMD)hasbecomearesearchhotspot00FDMsystemsrequirellighperformanceofsynchronizationTimingsynchronizationerrorswillcauseintersymbolinterference(ISI)，carrierfrequencysynchronizationerrorswillcause

4、intercarrierinterference(ici)，andsamplingfrequencyerrorswillintroduceICIandISIThesewillmaketheperformanceofsystemdeclineseriouslyAtpresentavarietyofsynchronizationmethodshavebeenproposedforthewirelesschannelOFDMsystemsOp

5、ticalfiberchannelOFDMsystemsgenerallyhaveaveryhightransmissionrateTheexistenceoffiberchannelnonlinearityanditsintricateinteractionwithfiberdispersionwhichisnonexistentinthewirelesssystems，leadtotheuncertaintyofsynchroniz

6、ationofOOFDMsystemsThusitisnecessarytodevelopasynchronizationmethod、^，ittlexcellentperfommceandlowcomputationalcomplexitysuitableforOOFDMsystemAccordingtodifferentsystemstructure，someOOFDMsystemsonlyneedtimingsynchroniza

7、tionwhileothersneedtimingsynchronizationandfrequencysynchronizationBasedonthedifferentstructuresof00FDMsystems，wediscussedsynchronizationalgorithmsindirectdetectionOOFDM∞D(zhuǎn)OOFDM)systemandcoherentopticalOFDM(COOFDM)systemT

8、heinnovationworksarcasfollows：1Anintensitymodulation(nvl)DD—OOFDMexperimentalsystembasedonstandardsinglemodeopticalfiber(SSMF)isestablishedWecomparedthreetypicaltimingsynchronizationalgorithmsinwirelesschannelThenanimpro

9、vedtimingsynchronizationalgorithmbasedonIrainingsequenceisproposedSimulationandexperimentalresultsshowthattheproposedalgorithmcanachievehighertimingsynchronizationaccuracyandacquisitionprobabilitywhenthereceivingpowerisl

10、ow2ThesynchronizationtechnologyofCO—OFDMsystemsisstudiedWeanalyzedtheprincipleoffrequencysynchronizationofSchmidlalgorithminCO—OFDMsystemsBased011thisalgorithmweproposedanimprovedonetrainingsymboljointtimingandfifecluenc