分布式無線通信系統(tǒng)中網(wǎng)絡技術的研究.pdf

1、北京郵電大學博士學位論文分布式無線通信系統(tǒng)中網(wǎng)絡技術的研究姓名：王瑜申請學位級別：博士專業(yè)：信號與信息處理指導教師：周炯槃20040528北京郵電大學博士學位論文英文摘要AbstractWhatthewirelesscommunicationsystempursuitsishigherfrequencyefficiencytoservetheincreasingdemandofbandwithinlimitedwirelessbandw

2、idthDistributedWirelessCommunicationSystem(DWCS)employsmacrodiversitytechnologybasedondistributedantennasandimprovesthesystemcapacitygreatlyItisatotallynewarchitecturewithVirtualCellandVirtualBaseStation，whichabandonthel

3、imitoftraditionalcellularconceptFirstlyweintroducethebackgroundofDWCSandtoday’Sresearchingonit，whichincludesthedomesticresearchworkandsomesimilarresearchworkofforeignscientistsFurthermore，thedevelopmenttrendtowarda11IPne

4、tworkwithmobileIPisdescribed，andtheresearchingontrafficmodelingiSdepictedSecondlytheusertransmissionpowerandthereverselinkcapacityofDWCSarecomparedwiththoseoftraditionalcellularsystemrespectivelyForfaimess，thesetwosystem

5、susethesamesetofantenna，butDWCSconnectstheantennaswithitsnewtopologyWiththetheoreticalanalysisandcalculation，itisprovedthatDWCSimprovessystemcapacityevidentlyThirdlybasedontheanalysisofaccessnetworkandallIParchitectureof

6、WCDMA，MobileIPthenetworkarchitectureandprotocolstackofDWCSiSpresented、andthefunctionofnetworkelementsaredefinedTheprotocolofaccessstratumnamedRadioAccessControlprotocoliSdesignedindetail。RACprotocolincludesthedefinitions

7、oflogicalchannelFSMofMobileNodeandProcessingNode，messageandinteractprocessingprocedureAsimulationanddemosystemofDWCSiSimplementedinOPNETsimulationplatforillInaddition，ahandoveralgorithmbasedonhandoverwindowiSpresentedtoo

8、vercomethe‘pingpang”effectMoreover、wegiveanadaptivealgorithmforantennachoosingandhandoverintheconditionofrandomantennalocationFourthlythetrafficmodelofHTTPandWAPserviceispresentedbasedontheanalysisofffacefilefromGPRSnetw