chration diversitych用户合作多样性.pptx

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2024/8/23StateKeyLab.ofISN,XidianUniversityPage1UsercooperationdiversityLiqiangZhao

2024/8/23StateKeyLab.ofISN,XidianUniversityPage2Whatisusercooperationdiversity?Anewformofspatialdiversity,inwhichdiversitygainsareachievedviathecooperationofmobileusers.

2024/8/23StateKeyLab.ofISN,XidianUniversityPage31.AnalysisMultipletransmitantennasisimpracticalintheuplinkofacellularsystem,duetothesizeofthemobileunit.Diversitygainsareachievedviatheuseofthepartner’santenna.Thatis,ineachcell,eachuserhasa“partner”.Eachofthetwopartnersisresponsiblefortransmittingnotonlytheirowninformation,butalsotheinformationoftheirpartner,whichtheyreceiveanddetect.

2024/8/23StateKeyLab.ofISN,XidianUniversityPage4Thisiscomplicatedbythefacts:Interuserchannelisnoisy.Bothpartnershaveinformationoftheirowntosend.Thisisnotasimplerelayproblem.

2024/8/23StateKeyLab.ofISN,XidianUniversityPage5PowerdeterminantThereisnocostintransmitpower,associatedwithtransmittingtoboththeultimatereceiverandyourpartner,sincemobileantennasareomnidirectional.

2024/8/23StateKeyLab.ofISN,XidianUniversityPage6However,therearetwootherfactorsthataffecttherequiredtransmitpower.Auserwillrequiremorepowerinordertosendbothusers’information.Auserwillrequirelesspowerbecauseofthediversitygains.Itisnotclearaprioritywhichoftheabovetwofactorswillbedominant.

2024/8/23StateKeyLab.ofISN,XidianUniversityPage72.Channelmodel

2024/8/23StateKeyLab.ofISN,XidianUniversityPage8

2024/8/23StateKeyLab.ofISN,XidianUniversityPage9ThereisnocontributionfromX2(t)inY2(t),thesameconditionasthereisnocontributionfromX1(t)inY1(t).Eventhoughtheyareactuallybothpresentattheterminalbelongingtouser2oruser1.Ourmodelassumes:

2024/8/23StateKeyLab.ofISN,XidianUniversityPage10Ourmodel

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