Wireless coherent OFDM modem simulation英文学习资料

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1、WIRELESSCOHERENTOFDMMODEMADesignProjectReportPresentedtotheEngineeringDivisionoftheGraduateSchoolofCornellUniversityinPartialfulfillmentoftherequirementsfortheDegreeofMasterofEngineering(ElectricalandComputer)ByFranciscoBastidas,RahulKopikareandGaëlleProtatProjectadvisor:AnnaScaglioneDegreedat

2、e:May2002AbstractMasterofElectricalandComputerEngineeringCornellUniversityDesignProjectReportProjecttitle:WirelesscoherentOFDMmodem.Authors:FranciscoRafaelBastidas,RahulKopikareandGaëlleProtatAbstract:Thisprojectaimwastobuildwirelesssoftwaremodemfordatacommunicationbetweentwocomputersusinganac

3、ousticinterfaceinthevoicefrequencyrange(20Hz–20,000Hz).Thetransmittingantennaisaspeaker(frequencyresponseof:90Hz–20,000Hz)andthereceivingantennaisamicrophone(frequencyresponseof:100Hz–16,000Hz).Thetestfilesusedasinformationfilesweretextfiles.Thisgoalwasattainedbothinanincoherentschemeandinacoh

4、erentscheme.BuildunderMatlabcode,ourmodemusesOFDM(orthogonalfrequencydivisionmultiplexing)modulation,synchronizationbyLMSsequence,channelestimation(noequalizer)viapilottones.ThesymbolsareeitherPSKorASKforaconstellationsizeof2or4.Tooptimizetheprobabilityoferror,thesesymbolsweremappedusingGrayma

5、pping.ReportApprovedbyProjectAdvisor:_________________________________________Date:____________WirelesscoherentOFDMmodem2001/2002ExecutivesummariesRahulKopikareRahul’smaincontributionwasinthedesignandcodingofthetransmitterandthereceiverofthemodem.Hismainworkwaswritingfunctionsandtestingthemona

6、simulatoralsodevelopedbyhim.HecontributedwithRafaeltowardstheinitialsimulationstofindtheQPSKandQAMerrorprobability.HealsocontributedwithGaëlletowardsexperimentsinfindingthechannellength.GaëlleProtatGaëllemainpartwastofindthecorrectprocessforthesynchronization(seesection4.1)andthechannelestimat

7、ion(seesection4.3).Assumptionsaboutthechannelmadeandcriteriadefined,shewasabletosearchforthemostappropriatesynchronizationsequenceandtrydifferentwaysofestimatingthechannel.Aspartofagroupproject,shealsohelpedinthebrainstormingandchoicesf