资源描述：
《massive-mimo 大规模mimo》由会员上传分享，免费在线阅读，更多相关内容在行业资料-天天文库。
1、1MASSIVEMIMOFORNEXTGENERATIONWIRELESSSYSTEMSErikG.Larsson,ISY,LinköpingUniversity,Swedenegl@isy.liu.seOctober10,2012MIMOtechnologyisawayofusingmultipleantennastosimultaneouslytransmitmultiplestreamsofdatainwirelesscommunicationsystems.MIMOincellularsystems
2、bringsimprove-mentsonfourfronts:•improveddatarate,becausethemoreantennas,themoreindependentdatastreamscanbesentout;•improvedreliability,becausethemoreantennasthemorepossiblepathsthattheradiosignalcanpropagateover;•improvedenergyefficiency,becausethebasestat
3、ioncanfocusitsemittedenergyintothespatialdirectionswhereitknowsthattheterminalsarelocated;and•reducedinterferencebecausethebasestationcanpurposelyavoidtransmittingintodirec-tionsinwhichspreadinginterferencewouldbeharmful.Basically,themoreantennasthebasesta
4、tion(andterminal)areequippedwith,thebetterper-formanceinallthesefourrespects.MIMOtechnologyforwirelesscommunicationsinitscon-ventionalformismaturing,andbeingincorporatedintorecentandevolvingwirelessbroadbandstandardslike4GLTEandLTE-advanced.Forexample,theL
5、TEstandardallowsforupto8antennaportsatthebasestation.MassiveMIMOisanemergingtechnology,thatscalesupMIMObyanorderofmagnitudecomparedtocurrentstate-of-the-art.1Wethinkofsystemsthatuseantennaarrayswithafewhundredantennas,thatsimultaneouslyservemanytensoftermi
6、nalsinthesametime-frequencyresource.ThebasicpremisebehindmassiveMIMOistoreapallthebenefitsofconventionalMIMO,butinamuchgreaterscale.Overall,massiveMIMOisanenablerforthedevelopmentoffuturebroadband(fixedandmobile)networkswhichwillbeenergy-efficient,secure,andr
7、obust,andwillusethespectrumefficiently.Assuch,itisanenablingtechnologyforthefuturedigitalsocietyinfrastructurethatwillconnecttheInternetofpeople,Internetofthings,withcloudsandothernetworkinfrastructure.Manydifferentconfigurationsanddeploymentscenariosformass
8、iveMIMOcanareenvisioned,seeFigure1.1F.Rusek,D.Persson,B.K.Lau,E.G.Larsson,T.L.Marzetta,O.EdforsandF.Tufvesson,“ScalingupMIMO:opportunitiesandchallengeswithverylargearrays,”toappearinIEEESignalProcessingMagazi
