FDD-LTE系统中的鲁棒帧同步方法(英文)-豆柴文库

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FDD-LTE系统中的鲁棒帧同步方法(英文)
RobustFrameSynchronizationMethodinFDD-LTESystem
Withtheincreasingneedforhigh-speedwirelesscommunication,theuseoftheFDD-LTEsystemhasgainedsignificantpopularityinrecentyears.However,synchronizationproblemswithintheFDD-LTEsystemhavebeenidentifiedasasignificantchallenge.Toovercomethesesynchronizationproblemsandimprovetheperformanceofthesystem,varioussynchronizationmethodshavebeenproposed.Thispaperaimstodiscussoneofthesemethods,therobustframesynchronizationmethodintheFDD-LTEsystem.
TheFDD-LTEsystemisbasedonOrthogonalFrequencyDivisionMultiplexing(OFDM),amodulationtechniquewhichusesmultiplecarrierstotransmitdata.Eachcarrierhasitsownphaseandfrequencyreference,whichmustbesynchronizedbetweenthetransmitterandreceivertoensuretheproperreceptionofdata.TheprimarysynchronizationchallengesfacedintheFDD-LTEsystemincludetimeoffset,carrierfrequencyoffset,andphasenoise.
ThefirststepinsolvingthesynchronizationproblemintheFDD-LTEsystemisframesynchronization.Framesynchronizationisresponsibleforidentifyingthestartofaframeinareceivedsignal.IntheFDD-LTEsystem,thisisachievedbyinsertingasynchronizationsignal,calledthePrimarySynchronizationSignal(PSS),atthebeginningofeveryLTEframe.
ThePSSisaknownsequencewithafixedlengthandstructurethatisusedtosynchronizethetransmitterandreceiver.ThePSShastwoparts:thefirstpartistheZadoff-Chu(ZC)sequence,andthesecondpartisascramblingcode,knownasthecellidentity(CID).TheZCsequenceisusedtoestimatethetimeoffset,whiletheCIDisusedtoidentifythespecificcellinthenetwork.
TherobustframesynchronizationmethodintheFDD-LTEsystemisdesignedtoovercomethesynchronizationproblemsinherentinthecommunicationchannel.Themethodusestwo-dimensionalcorrelationtoimprovetherobustnessofthesynchronizationprocess.Thetwo-dimensionalcorrelationmethodisbasedonthecorrelationcoefficientbetweenthereceivedsignalandareferencesignal,whichisacomplexconjugateofthePSS.
Thetwo-dimensionalcorrelationmethodisdividedintotwoparts:thecoarseandfinesynchronization.Thecoarsesynchronizationisresp