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1、RUI_LAYOUT_Layout18/29/132:24PMPage101ACCEPTEDFROMOPENCALLCARRIERAGGREGATIONFORLTE-ADVANCED:UPLINKMULTIPLEACCESSANDTRANSMISSIONENHANCEMENTFEATURESYUNRUI,CHINESEACADEMYOFSCIENCESANDSTATEKEYLABOFISNPENGCHENG,SHANGHAIJIAOTONGUNIVERSITYMINGQILI,CHINESEACADEMYOFSCIENCESQ.T.ZHANG
2、,NANJINGUNIVERSITYOFPOSTSANDTELECOMMUNICATIONSMOHSENGUIZANI,QATARUNIVERSITYABSTRACTIMT-AdvancedsystemsisthattheirenhancedpeakdataratesshouldsufficetosupportMultipleaccessandtransmissionenhance-advancedservicesandapplications,reachingupmentinsupportofcarrieraggregationtechni
3、questo1Gb/sinstaticenvironmentand100Mb/sinhasbeenactivelystudiedinthe3GPPLTE-high-speedmobileenvironments.Advancedstandardizationprocessofthenext-TheeffortsoftheITUreceiveactiverespons-generationmobilebroadbandcommunicationesfromthewirelesssector.Shortlyafterthesystems.Byme
4、ansofcarrieraggregation,usersreleaseof[1],theThirdGenerationPartnershipcanaccessatotalbandwidthofupto100MHzinProject(3GPP)completeditsLongTermEvolu-ordertomeettheIMT-Advancedrequirements.tion(LTE)standardsfamilyRelease8(Rel.8)Thisarticlefirstintroducesandcomparesseveralin20
5、09,whichdefinesandspecifiesnewfunc-uplinkmultipleaccessschemesinLTE-Advancedtionalities,characteristicsandkeytechnologiesstandard.Technicalchallengesarisingfromtheforbeyond3G(B3G)mobilesystems.Furtheruseofcarrieraggregationisthenaddressed,withenhancementovertheLTEiscurrentl
6、yunderfocusonreferencesignalsdesignforuplinkinvestigationintheLTE-Advanced(LTE-A)transmission.Meanwhile,variouscandidatestandardizationprocess,aimingtomeet,orevenoptionsaresummarizedandcomparedintermsexceed,theIMT-Advancedrequirementsonoftheirsystemperformance,computational
7、com-datarates,transmissionbandwidthandmobilityplexity,anddesignflexibility.Thearticlefurther[2]whilepreservingbackwardcompatibilitywithproceedstoinvestigatethelinkperformancewithLTEsystems.Forbackwardcompatibilityandcarrieraggregation,takingintoaccountthepres-flexiblebandwi
8、dthallocationtodifferentusers,enceoffrequencyoffsetandfastfadinginthecarrieraggreg
