OFDM在衰减信道内的仿真(英文)(Matlab)

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1、CSMSimulationReportNINGLIOFDMInFadingChannels14074715CommunicationSystemModellingSimulatingOFDMCommunicationSystemsinFadingChannelsDepartmentofElectronicandElectricalEngineeringMScinWirelessandOpticalCommunicationsAuthor:NINGLIStudentNO.:14074715Date:21/01/20151CSM

2、SimulationReportNINGLIOFDMInFadingChannels140747151.IntroductionMultipathFadingandSimulationofRayleighFadingChannelsInwirelesscommunications,multipathfadingisapropagationphenomenonthatsignalstransmittedfromasourcearriveatthereceiverantennaintwoormorepaths,resulting

3、inconstructiveanddestructiveinterferencebetweensignalsarisingfrommultiplepaths[1].Rayleighfadingisoneofthemodelsthatareusedtodescribetheformoffadingthatoccurswhenmultipathpropagationhappens.Whentherearealargenumberofpaths,thecentrallimittheoremcanbeappliedtomodelth

4、etime-variantimpulseresponseofthechannelasacomplex-valuedGaussianrandomprocess[2].AsnapshotoftheRayleighchannelresponseisshowedasfollow:Figure1.1:AsnapshotoftheRayleighFlatFading[3].TheobjectiveofthefirstpartofthisreportistobuildasignalmodelforISIchannels.Inthiswor

5、k,L-rayRayleighfadingchannelswillbesimulatedastheISIchannels.Inthechannel,powerisnormalizedtobeequalandthetimedelaybetweeneachrayislimitedto2.Meanwhile,Lcomplexfadingcoefficientsα?arealsogoingtobegeneratedinwhicheachofthemhasaRayleighdistributedamplitudeandauniform

6、lydistributedphase.Incombinationofafunctionf(assumedtoberectangular)andfadingcoefficients,aToeplitzchannelmatrix??,?willbebuilt.Essentially,asequenceofNindependentQPSKsymbolswillbecreatedwhichactsasaroleoftheinputsignalofthissimulation.Eventually,therelationshipbet

7、weenthesimulationinputandoutput,alongwiththesystemsymbolerrorrate(SER),canbeobtained,withtheinfluenceofasequenceofNindependentnoisesamples.Multi-carrierSystemandtheSimulationoftheOFDMSystemThefirstpartoftheintroductiontalksaboutthesevereimpactofmultipathpropagation

8、inwirelesscommunications.Inordertomeettherequirementoftransmittinglargeamountofdatainradiochannels,thephenomenonofmultipathpropagationmustbeoverc