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空间分集多阵列天线系统中的下行转输技术 Abstract Multi-antennasystemsarewidelyusedinwirelesscommunicationstoimprovethesystemcapacityandenhancethequalityofcommunication.Spacedivisionmultipleaccess(SDMA)isthemosteffectivewaytoutilizethespatialresourceinmulti-antennasystems.Inthispaper,wediscussthedownlinktransmissiontechnologyofSDMAinmulti-antennasystems.ThepaperstartswithabriefintroductiontoSDMAandmulti-antennasystems,followedbyadiscussiononthevariousSDMAtransmissiontechniques.ThepaperconcludeswithadiscussionontheimportantissuesandchallengesforthepracticalimplementationofSDMAinmulti-antennasystems. Introduction Withthegrowthofwirelesscommunicationapplications,therehasbeenanenormousincreaseinthedemandforhigherdataratesandbetterqualityofcommunication.Multi-antennasystemsarebecomingincreasinglypopulartoachievetheseobjectives.Theuseofmultipleantennasatboththetransmitterandreceiverprovidesanopportunitytoexploitthespatialdiversitysoastoincreasethesystemcapacityandtoenhancethequalityofcommunication. Spacedivisionmultipleaccess(SDMA)isapromisingtechnologythatutilizesthespatialresourceofmulti-antennasystemstoachievehigherdataratesandbetterqualityofcommunication.TheSDMAtechnologyenablesthesimultaneoustransmissionofmultiplesignalstomultipleusersinthesamefrequencybandbyexploitingthespatialdiversityandreducinginterferenceamongusers. ThispaperfocusesonthedownlinktransmissiontechnologiesofSDMAinmulti-antennasystems.Therestofthepaperisorganizedasfollows.InSectionII,webrieflyintroducetheconceptofSDMAandmulti-antennasystems.InSectionIII,thevariousSDMAtransmissiontechniquesarediscussed.InSectionIV,wediscusstheimportantissuesandchallengesforthepracticalimplementationofSDMAinmulti-antennasystems.Finally,weconcludethepaperinSectionV. SpaceDivisionMultipleAccess Spacedivisionmultipleaccess(SDMA)isawirelesscommunicationtechnologythattakesadvantageofthespatialdiversityprovidedbyamulti-antennasystem.TheSDMAtechnologyallowsthetransmissionofmultiplesignalstomultipleusersatthesametimeandfrequency.Thisisachievedbyex