mimo-ofdm系统中信道估计和载波频偏估计技术的研究

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1、information,thispaperproposesachannelestimationmethodbasedonextendedKalmanfiltering(EKF).Onthebasis,consideringthatwirelesschannelscanshowthenonlinearcharacteristics,thispaperappliesanonlinearsignalprocessingmethodwhichiscalledunscentedKalmanfiltering(UKF)tothechann

2、elestimationfield.ThusthispaperproposesachannelestimationmethodbasedonUKF.ComputersimulationsprovethattheBERandMSEperformanceofUKFbasedchannelestimationmethodoutperformstheotherchannelestimationmethods.High-speeddatatransmissioninwirelesscommunicationspotentiallyres

3、ultsinasparsemultipathfadingchannel.Thesignificanttapsapproachcanbeusedtogreatlyimprovetheperformanceofthechanneltimeresponse.Inthethesis,anadaptivesignificant-tap-catchingmethodbasedonmultipathsearchisproposed.CombinedwithbasedUKFchannelestimation,thesimulationBERa

4、ndMSEperformanceindicatesthatadaptivesignificant-tap-catchingmethodisbetterthanfixedsignificant-tap-catchingmethod.Meanwhile,thecomputationcomplexitydecreasedalot.ThenthecarrieroffsetisresearchedinOFDMsystemandbasedUKFcarrieroffsetestimationmethodisproposed.Thesimul

5、ationperformanceindicatesthemethodhasexactedestimationperformanceandtheIVbandwidthefficiencyishigherthanSCmethodandMLEmethod.ThethesisadaptedthebasedUKFchannelandcarrieroffsetjointestimationinMIMO-OFDMsystemwhichhascarrieroffsetandmultipatheffect.Thesimulationperfor

6、mancedemonstratedthemethodcanestimatethechannelinformationandcarrieroffsetatthesametime.ChannelestimationandcarrieroffsetestimationarekeytechniquesinMIMO-OFDMcommunicationsystem.Thethesisdidsomeworkondecreasingchannelestimationcomputationcomplexity,enhancingthepreci

7、sionofchannelestimationandincreasingthebandwidthusageofcarrieroffsetestimation.However,channelestimationisanimportantpartofcommunicationsystem.Thedifficultyiscombinationbetweenchannelestimationwithothertechniques,suchaslinkadaptationandHARQinMAClayer,whichneedsmorea

8、nddeeperresearch.KeyWords:MIMO,OFDM,Adaptivetechnique,Channelestimation，Significant-tap-catching,Carrieroffset,UKFV英文缩略语说明3GThirdGeneratio