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1、TAOLAYOUT_Layout15/23/1211:45AMPage65LTE-ADVANCEDAND4GWIRELESSCOMMUNICATIONS:PART2AnOverviewofCooperativeCommunicationsXiaofengTao,XiaodongXu,andQimeiCui,KeyLab.ofUniversalWirelessCommunications(MinistryofEducation),BeijingUniversityofPostsandTelecommunicationsABS
2、TRACTnetworkcannotmeetthedesiredhighdaterate.Cooperativecommunicationshaverecently?Thefrequencyofhandoverinhighspeedbeenmigratedtooneofstate-of-the-artfeaturesmobileenvironment(350km/h)thatmakesof3GPPLTE-Advanced(LTE-A).Cooperativethetraditionalnetworkhardtosuppor
3、tandcommunicationsfundamentallychangethemuchmoreexpensive.abstractionofawirelesslinkandoffersignifi-?What’smore,forfuturemobilecommunica-cantpotentialadvantagesforwirelesscommuni-tionsystemsworkingatfrequencieshighercationnetworks.Thisarticlevisitscooperativethan2
4、GHz,thecelledgeeffectbecomestechniques,suchasrelay,distributedantennasmoreseriousduetothelargerattenuationsystems(DAS),multicellcoordination,Groupoftheradiosignal.Cell,CoordinatedMultiplePointtransmissionInordertoovercomesuchproblems,someandreception(CoMP),thosetu
5、rnthetradition-cooperativetechniqueshaveemerged,suchasalcellularsystemintoacooperativesystem.Inrelay,distributedantennassystems(DAS),andparticular,weproposeseveraljointprocessingmulticellcoordination.AllthesetechniqueshavepoliciestodemonstratetheGroupCell(CoMP)tur
6、nedthetraditionalcellularsystemintoaconcept.Resultsofatrialnetworkimplementa-cooperativesystem.Cooperativecommunica-tionandaperformanceevaluationofthecon-tionsdramaticallychangetheabstractionofaceptarealsoreported.wirelesslinkandoffersignificantpotentialbene-fitst
7、owirelesscommunicationnetworks.Incon-INTRODUCTIONtrasttosingle-nodetransmissions,cooperativecommunicationsmayinvolvemultiplenodesThecellularconceptwasamajorbreakthroughtransmittingsimultaneouslytoareceiver.Theinsolvingtheproblemofspectralcongestionfollowingpartsco
8、ncludethetypicalfeaturesofandusercapacity,itofferedveryhighcapacityRelay,DASandmulticellcoordinationtech-inalimitedspectrumallocationwithoutanyniques.ma
