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非整数倍路径时延下的OMP信道估计方法.docx

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非整数倍路径时延下的OMP信道估计方法 Title:OMPChannelEstimationMethodinNon-IntegerMultiplesPathDelay Abstract: OrthogonalMatchingPursuit(OMP)isawidelyusedmethodforchannelestimationinwirelesscommunicationsystemsduetoitsabilitytoselectthemostsignificantpathsofthechannel.However,inscenarioswherethepathdelayisnotanintegermultiple,thetraditionalOMPalgorithmmayleadtoinaccuratechannelestimation.Inthispaper,weproposeanOMPchannelestimationmethodthataddressestheproblemofnon-integermultiplespathdelay.TheproposedmethodutilizesamodifiedOMPalgorithmthatincorporatesadelayestimationtechniquetoaccuratelyestimatethechannelinsuchscenarios.SimulationresultsdemonstratethattheproposedmethodoutperformsthetraditionalOMPalgorithminnon-integermultiplespathdelayscenarios,therebyenhancingtheaccuracyandreliabilityofchannelestimation. 1.Introduction Inmodernwirelesscommunicationsystems,accurateestimationofchannelparametersiscrucialforefficientandreliabledatatransmission.TheOrthogonalMatchingPursuit(OMP)algorithmhasproventobeapowerfultoolforchannelestimation,asitallowsfortheselectionofthemostsignificantpathsofthechannel.However,inscenarioswherethepathdelayisnotanintegermultiple,thetraditionalOMPalgorithmfailstoaccuratelyestimatethechannel. 2.ProblemStatement Thedelayestimationproblemariseswhenthepathdelayisnotamultipleofthesamplingperiodofthesystem.Insuchscenarios,thetraditionalOMPalgorithmincorrectlyselectstheclosestintegermultipleofthepathdelay,leadingtoinaccuratechannelestimation.Thisproblembecomesparticularlysignificantinwirelesscommunicationsystemswithhighmobilityorinthepresenceofmultipathfading. 3.ProposedMethod Toaddresstheproblemofnon-integermultiplespathdelay,weproposeamodifiedOMPchannelestimationmethodthatincorporatesadelayestimationtechnique.Thealgorithmconsistsofthefollowingsteps: 1.Initialization:Initializethechannelestimateaszeroandsettheresidualasthereceivedsignal. 2.PathSelection:Selectthepathwiththemaximumcorrelationbetweentheresidualandthedictionary,whichrepresentsthepossibledelaysandcomplexgain