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1、PrecodingforMIMOUplinkTransmissionOverEM-Lens-BasedCorrelatedChannelsGeorgeYammine,SebastianSternandRobertF.H.FischerInstitutfürNachrichtentechnik,UniversitätUlm,Ulm,GermanyEmail:{george.yammine,sebastian.stern,robert.fischer}@uni-ulm.deAbstractInmultiple-input/multiple-output(MIMO)syste
2、ms,effectivedimensionality(degreesoffreedom)ofthesystem,advancedequalizationorprecodingschemesarenotonlyknownresultinginaperformancedegradation[17].Todealwiththisforprovidinginterferencemitigation,buttheyalsohavebeendegradation,suiteddetectionschemesmustbeemployed.proventoexploittheMIMO
3、channel’sdiversity.However,inthecaseofmassiveMIMO,thecomputationalcomplexityofsuchInthispaper,wepresentanextensiontotheEM-lens-schemesmakethemunfeasible.Tosolvethisproblemfortheenableduplinksystem,wheretheusersareequippedwithmul-uplinkscenario,anelectromagnetic(EM)lensmaybeemployedtiple
4、transmitantennas.Wethenanalyzetheperformanceofatthereceiver.Iteffectivelyfocusesthereceivedpowerontoadifferentstrategiesthatareapplicabletothescenarioinhand.smallernumberofantennas.Hence,theapplicationoftechniquesThisincludesthetransmissionviasingularvaluedecomposi-knownfromclassical(no
5、n-massive)MIMOsystemsisenabledinMIMOsystemswithalargenumberofantennas.However,tion(SVD)whichiswell-knownfromclassical(non-massive)buildingsuchEM-lens-enabledsystemscomeswithadrawback.point-to-pointMIMO[16].Besides,thephilosophyoflattice-Duetophysicallimitations,itmaybeimpossibletospacer
6、eduction-aidedlinearequalization(LRALE)[19],[18]istheantennaelementsinawaytoprovidespatiallydecoupledadaptedtothescenarioinhand.Theanalysisissupportedbychannelsatthereceiver,whichresultsinaperformanceloss.numericalsimulationsthatcoverbothcodedanduncodeddataInthispaper,thisissueisaddress
7、edbyfirstextendingtheEM-lens-enabledsystemtoincludemultipleantennasatthetransmission.Thecomplexityvs.power-efficiencytrade-offoftransmitter.Followingthis,differentequalizationstrategiesfortheabovementionedsystemsisassessed.thisscenarioareassessed.TheperformanceoftheproposedThepap
