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1、2180IEEETRANSACTIONSONVEHICULARTECHNOLOGY,VOL.57,NO.4,JULY2008InfrastructureRelayTransmissionWithCooperativeMIMOYounsunKim,StudentMember,IEEE,andHuiLiu,SeniorMember,IEEEAbstractAninfrastructurerelaysystemthattransfersinfor-mationfromabasestationtoarandomlylocatedmobilestation(MS)usi
2、ngfixed-locationrelaystations(RSs)isstudied.Transmis-sionratesarederivedforserial,parallel,andhybridrelaytrans-missions,consideringtheutilizationofRSsasameanstoextendthedimensionalityofamultiple-inputmultiple-output(MIMO)transmission.Thederivedtransmissionratefortheserialrelaytransmi
3、ssionisoptimizedbydeterminingtheoptimallocationsoftheRSsandthenumberofhops.Inaddition,selectionschemesfordeterminingwhichRSstoactivatetomaximizethetransmissionrateareprovidedforparallelandhybridrelaytopologies.Basedontheanalyticfindings,numericalresultsareobtainedforvariousdeployment
4、scenariostocompareandevaluatedifferentrelaytopologiesanddesigncharacteristicsofarelaysystem.IndexTermsCapacity,cooperative,multiple-inputmultiple-output(MIMO),relay.Fig.1.Infrastructurerelaytransmission.I.INTRODUCTIONELAYtransmissionhasbeenidentifiedasoneofthecoredirectlyappliedtoinf
5、rastructurerelaysystems.ThefocusofRtechnologiesthatcouldenablerobusthigh-speedinfor-thispaperistoanalyzeandevaluateaninfrastructurerelayinamationtransferoverachallengingwirelessenvironment.Bysingle-BS–multiple-RSenvironment.positioningrelaysbetweensourceanddestination,itispossibleIn
6、anywirelesssystem,RSsdedicatedforthesolefunc-tobenefitthetransmissionintermsofhighertransmissionratetionofrelayingrepresentsanadditionalcostfactorinsystemandwidercoverage.Duetosuchbenefits,muchresearchhasdeployment.Therefore,thedesignofaninfrastructurerelaybeendevotedtoanalyzingtherel
7、aychannel[1]andrealizingitssystemmustconsiderthebalanceofenhancingthesystem’spotential[2]–[4].However,uptonow,muchofthisefforthasperformancebyincreasingthenumberofRSsandtherelatedbeenontherelaytransmissionsforadhocnetworks,wherethecost.Someexamplesofdesignissuesthatneedcarefulconsid
8、-rolesofsource,dest
