下一代蜂窩通信系統(tǒng)中同步中繼傳輸關(guān)鍵技術(shù)研究.pdf

1、浙江大學(xué)信息與電子工程學(xué)系博士學(xué)位論文下一代蜂窩通信系統(tǒng)中同步中繼傳輸關(guān)鍵技術(shù)研究姓名：李力申請學(xué)位級別：博士專業(yè)：電磁場與微波指導(dǎo)教師：孔金甌杜陽20090401摘要AbstractWhenimplementingtherelaytechniqueintoawirelesscellularsystem，theresultantrelaycellularnetworkcanachievedramaticallyhighersystemc

2、apacityandspectrumefficiencythroughmulti—hoptransmissionandcooperativediversityThisresearchfocusesoninvestigatingsomeofthekeytechnologiesforsynchronousrelayinginnextgenerationsystemsofwirelesscellularcommunicationFirstas

3、ynchronizationstrategyispresentedfortheOFDMsystemwhichcoversboththedownlinkphysicalandMAClayersynchronizationBasedonourproposedtrainingsequencestructure，thesymbol—wisetimingandfrequencysynchronizationalgorithmsarestudied

4、TheoptimizeddownlinkcellsearchprotocolisshowntOenabletheflamesyn—1chronizationandbasestationinformationdetectionNextanadaptivecooperativecoding(ACC)protocolisproposed，wherethesourcetransmitsthecodedbitsequencetothedestin

5、ationthroughtwoindependentlinksintwosteps，eachwithratesadaptedtothecurrentchannelconditionNumericalanalysisdemon—stratesthatthestrictandasymptoticupperboundsoftheoreticalperformancefortheACCprotocolareattainedundervariou

6、schannelconditionsTheoptimalpowerallocationalgo—rithmisalsostudiedtofurtherenhancethesystemperformanceThenthreedifferentbidirectionalrelayingprotocolsareexaminedandtheirtheoreticalthroughputsarepredictedbytheShannontheor

7、yThebi—directionalamplificationofthroughput(BAT)protocolsutilizingthenetworkcodingoverperformstheconventionaloneduetotheirhighertransmitefficiencyTheoptimalpowerallocationalgorithmsfortheseprotocolsareshowntoimprovetheth

8、roughputsaswellasrobustnesstoasymmetricchannelconditionsTheMarkovchainisusedtomodelthebidirectionalprotocolsforanalyzingthroughputsunderadversechannelconditionsFinallyaninterferencecancellation(IC)basedBATprotocolispropo