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《ofdm系統(tǒng)中基于能量檢測(cè)的頻譜感知》由會(huì)員上傳分享，免費(fèi)在線閱讀，更多相關(guān)內(nèi)容在學(xué)術(shù)論文-天天文庫(kù)。
1、SpectrumSensingForanOFDMSystemusingEnergyDetectionMethodDEDICATIONThisthesisisdedicatedtoallpeoplenearorfarwhoparticipatesforthesuccessofthiswork,especiallymyfamilyandmycountrymateinchinafortheirsupportandencouragement.II萬(wàn)方數(shù)據(jù)MasterthesisABSTRACTWiththedevelopmentofthewirel
2、esscommunicationsystem,theneedofthespectrumgrowsaccordingly.Howeverthespectrumresourcehasbeentraditionallyallocatedtoafixedmanner,beingallunlicensedusersprohibitedfromtransmittingonalicenseduser’sspectrumband.Howevermostoftheallocatedspectrumisidledinsometimeandlocation.Th
3、eFederalCommunicationCommissionresearchreportrevealsthatseventypercentoftheallocatedspectrumisunderutilized.Forthisreasonanewtechnologyhasbeeninvestigatedtoallowunlicenseduserstoaccesstotheunusedspectrum.Cognitiveradioisanemergenttechnologyproposedoverthelastfewyearstoallo
4、wthereuseofthevacantspectrumwithoutcausinganyinterferencewiththelicenseduser.Spectrumsensingisthekeyenablingtechnologyincognitiveradiosystem.Withthedevelopmentofthemultimediawirelessapplicationwearefacingofaneedofhighdatarate.OrthogonalFrequencyDivisionMultiplexing(OFDM)is
5、adigitaltransmissionmethoddevelopedtomeettheincreasingdemandforhigherdataratesinwirelessmoderncommunications.Manydetectiontechniqueshasbeendevelopedintheliteratureforthespectrumsensingtechniqueinordertoallowunlicensedusertousethespectrumresourcewithoutcausinganyharmfulinte
6、rferenceforthesystem.Thosetechniquescanbedifferentintheirperformanceandtheapplicationsystem.Themaincontributionofthisthesisisanimplementationofaspectrumsensingtechniqueandevaluatestheperformanceofthattechnique.Thetechniqueusedhereistheenergydetection(ED)techniquebasedspect
7、rumsensingincaseofanOFDMcommunicationsystem.Keywords:Cognitiveradio,spectrumsensing,energydetection,OFDM.III萬(wàn)方數(shù)據(jù)SpectrumSensingForanOFDMSystemusingEnergyDetectionMethod詳細(xì)中文摘要無(wú)線通信業(yè)務(wù)（如數(shù)據(jù)業(yè)務(wù)、語(yǔ)音業(yè)務(wù)、多媒體業(yè)務(wù)等）爆炸式的增長(zhǎng)，從而使得無(wú)線頻譜資源的需求快速加大，可用的無(wú)線頻譜資源也變得越來(lái)越少，進(jìn)一步導(dǎo)致了可用頻譜資源與頻譜需求之間的矛盾也日益突出，這種矛盾
8、嚴(yán)重的制約了整個(gè)無(wú)線通信業(yè)務(wù)的健康與快速發(fā)展。然而，頻譜資源是無(wú)線通信最重要的資源，發(fā)展高效的頻譜管理技術(shù)已經(jīng)是迫在眉睫?，F(xiàn)有的頻譜分配主要采用固定分配頻譜的方法，也就是將無(wú)線頻
