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1、1398IEEETRANSACTIONSONWIRELESSCOMMUNICATIONS,VOL.6,NO.4,APRIL2007OptimalDesignofNon-RegenerativeMIMOWirelessRelaysXiaojunTangandYingboHua,Fellow,IEEEAbstractGivenamultiple-antennasourceandamultiple-relayisconsidered.Aregenerativerelayregeneratestheorig-antennadestin
2、ation,amultiple-antennarelaybetweenthesourceinalinformationfromthepreviousnodebeforeitretransmitsandthedestinationisdesirableunderusefulcircumstances.theinformationtothenextnode.In[10],itisalsoassumedAnon-regenerativemultiple-antennarelay,alsocallednon-thattherelayr
3、eceivesandtransmitssignalssimultaneouslyregenerativeMIMO(multi-inputmulti-output)relay,isdesignedtooptimizethecapacitybetweenthesourceandthedestination.atacommonfrequency.Whiletheoreticallypossible,thisWithoutadirectlinkbetweenthesourceandthedestination,isapractical
4、lyunstableapproachbecausethepowerofthetheoptimalcanonicalcoordinatesoftherelaymatrixarefirsttransmittedsignalattherelaytypicallyovershadowsthepowerestablished,andtheoptimalpowerallocationsalongtheseco-ofthedesiredsignalattherelay.Currently,thereisnoordinatesarethenfo
5、und.Thesystemcapacitywiththeoptimaltechnologythatallowsarelaytoworkintheabovemode.relaymatrixisshowntobesignificantlyhigherthanthosewithheuristicrelaymatrices.Whenadirectlinkispresent,upperTherelaytobeconsideredinthispaperusestwoorthogonalandlowerboundsoftheoptimalsy
6、stemcapacityarediscussed.channelsforreceptionandtransmission.IndexTermsMultiple-antennarelay,MIMOrelay,non-Whilethereisanaturalneedforregenerativerelaysforregenerativerelay,capacityanalysis,optimalcanonicalcoordi-whichadecode-and-forwardscheme(DF)isneeded,therenates
7、,optimalpowerallocation.isalsoaneedfornon-regenerativerelaysforwhichonlyanamplify-and-forwardscheme(AF)isrequired.ComparisonsI.INTRODUCTIONoftheperformancesoftheDFandAFschemesforsingle-antennarelaysystemsarerecentlyshownin[11]and[5].IRELESSrelayingisessentialtoprovi
8、dereliableIthasbeenobservedthattheAFschemecanachieveaWtransmission,highthroughputandbroadcoverageforbetterdiversityorderwiththesamemultipl
