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1、-RapidMIMO-OFDMSoftwareDefinedRadioSystemPrototypingAmitGupta,AntonioForenza,andRobertW.HeathJr.WirelessNetworkingandCommunicationsGroupDepartmentofElectricalandComputerEngineering,TheUniversityofTexasatAustin1UniversityStationC0803,Austin,TX78712-0240USAPhone:+1-512-232-2014,Fax:+1-512-471
2、-6512{agupta,forenza,rheath}@ece.utexas.eduAbstract—Multipleinput-multipleoutput(MIMO)isanattractivetechnologyforfuturewirelesssystems.MIMOcommunication,enabledbytheuseofmultipletransmitandmultiplereceiveantennas,isknownforitshighspectralefficiencyaswellasitsrobustnessagainstfadingandinterf
3、erence.CombiningMIMOwithorthogonalfrequencydivisionmultiplexing(OFDM),itispossibletosignificantlyreducereceivercomplexityasOFDMgreatlysimplifiesequalizationatthereceiver.MIMO-OFDMiscurrentlybeingconsideredforanumberofdevelopingwirelessstandards;consequently,thestudyofMIMO-OFDMinrealisticenv
4、ironmentsisofgreatimportance.ThispaperdescribesanapproachforprototypingaMIMO-OFDMsystemusingaflexiblesoftwaredefinedradio(SDR)systemarchitectureinconjunctionwithcommerciallyavailablehardware.Anemphasisonsoftwarepermitsafocusonalgorithmandsystemdesignissuesratherthanimplementationandhardware
5、configuration.Thepenaltyofthisflexibility,however,isthattheeaseofusecomesattheexpenseofoverallthroughput.Toillustratethebenefitsoftheproposedarchitecture,applicationstoMIMO-OFDMsystemprototypingandpreliminaryMIMOchannelmeasurementsarepresented.Adetaileddescriptionofthehardwareisprovidedalon
6、gwithdownloadablesoftwaretoreproducethesystem.I.INTRODUCTIONMultiple-inputmultiple-output(MIMO)wirelesssystemsusemultipletransmitandmultiplereceiveantennastoincreasecapacityandproviderobustnesstofading[1].Toobtainthesebenefitsinbroadbandchannelswithextensivefrequencyselectivity,MIMOcommunic
7、ationlinksrequirecomplexspacetimeequalizers.ThecomplexityofMIMOsystemscanbereduced,however,throughorthogonalfrequencydivisionmultiplexing(OFDM).OFDMisanattractivedigitalmodulationtechniquethatpermitsgreatlysimplifiedequalizationatthereceiver.WithOFDM,the
