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1、ABSTRACTABSTRACTWiththeincreasingdemandofwirelesscommunications,thenumberofmobileterminalsisfastgrowingandthewirelesstrendisinvincibly.The5GWi-Fi(thefifthGenerationWIreless-FIdelity)whichcansatisfyhigherthroughputispressingforwardatthisrightmoment.However,thedevelopmentislimite
2、dtothecomplexityofthealgorithmandtheconsumptionofhardwareresources,whichleadsthe5GWi-Finotwidelyused.Meanwhile,duringtheprocessofimplementation,theexistingalgorithmsuseeitherbyincreasingthecostoftimeoradditionalhardwareresourcestoensuretheperformanceofthealgorithm.Besides,synch
3、ronizationisthepreconditionofanycommunicationsystem.Thisthesisproposesseveralimprovedalgorithmsinordertosolvetheproblemsofexistingalgorithms,inordertoachievetheimplementationofsynchronization.ThenthisthesisanalysesthecharacteristicsofcommunicationsystemsbasedonIEEE802.11acproto
4、colsindetail,providesandsimulatesthefourcoremodules.Thecoremodulesareframedetection,roughfrequencysynchronization,symbolsynchronizationandfinefrequencysynchronizationmodules.Theimprovedalgorithmsaregivenasfollows,①proposesaframedetectionunionimpulsenormalizationalgorithmdealing
5、withthelargerangeofpeakvalueofimpulsechangewithSNR,withtheoutputofframedetectortonormalizetheoutputofsymbolsynchronization,whichmakestherangeofpeakvalueofsymbolsynchronizationdecreaseto50%ofthetraditionalalgorithm;②proposesadelayaddingimpulsedetectionalgorithmaimedattheproblemo
6、fimpulsedetection’sdifficultyofmultipleantennasystems,withthemethodofdelayaddertomakethetwofuzzyimplusestoonedeterminedimpluse,whichmakestheprobabilityofcorrectlydetectionoftheimpulseincreasedby100%;③proposesalow-complexityco-correlationalgorithminallusiontothehardwareconsumpti
7、on,withthemethodofquantifyingthelongtrainingsequencetobethenearestvalueofintegerpowerof2toachieveusingasingleshifttoimplementamultiplier,whichmakesthemultipliercorezeroconsumption.Afterthat,theanalysisofIIABSTRACTperformanceindexofthewholeIEEE802.11acbasebandsystemiscarriedout.
8、Lastly,theimprovedsynchronizationalgorithmisachievedin