基于IEEE802.16E的协同网络及其动态资源分配机制研究

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1、上海交通大学硕士学位论文基于IEEE802.16e的协同网络及其动态资源分配机制研究姓名：周密申请学位级别：硕士专业：软件工程指导教师：梁阿磊;周保强20080601ResearchonDynamicResourceAllocationSchemesforIEEE802.16e-basedcooperativenetworksABSTRACTTosatisfythedemandforbroadbandwirelessaccess,IEEEestablished802.16WG(WorkGroup)todevelo

2、pthestandardforWirelessMetropolitanAreaNetworks,i.e.,WiMAX(WorldwideInteroperabilityforMicrowaveAccess),whichincludesafixedversion(802.16d)andamobileversion(802.16e).Themainproblemisthathighdataratescannotcoveralltheareasiftraditionalcellularnetworkingarchite

3、ctureisadopted.Especially,thelowqualityofthereceivedsignalintheboundaryofacellresultsinlowthroughputandunfairnessamongusersinthethroughput;Cooperativediversityisanewdiversitymethodthatcanconquertheeffectofmulti-pathinmobilecommunicationsystems.Itcanrealizecoo

4、perationamonguserswithsingleantenna,andmakeusersshareantennaeachothertoperformvirtualMIMO(MultipleInputMultipleOutputs)arrays,andbenefitfromspatialdiversity.Cooperativediversitycanincreasethecapacityofthesystemsignificantly.Inthisthesis,westudiedhowtointegrat

5、ethecooperativediversityto802.16enetworkstoimprovetheperformanceandfairnessofbroadbandwirelessaccesssystem.Therearemainlytwocontributionsinthethesis.Firstly,weproposedan802.16e-basedcooperativenetworkmodel.Tomaketheoperationofproposednetworkefficient,wefurthe

6、rdesignedanewOFMDAframestructurebasedontheexisting802.16eOFDMA/TDDframestructure.AnothercontributionisthatweproposeddynamicresourceallocationschemesandalgorithmsfortheIEEE802.16e-basedcooperativenetwork.Theresourceallocationsincludecooperationpartnerselection

7、andOFMDAsubcarrierallocation.WeselectcooperationpartnernodeaccordingtoSNR(SignaltoNoiseRatio)betweenusersandSNRbetweenBS(BaseStation)anduser.Usersaredividedintotwogroups:setofcooperationusersandsetofnon-cooperationusersthroughpartnerselection.Theproposedalgor

8、ithmforOFMDAsubcarrierallocationisimplementedoneverysubframes,andassignssubcarrierstousersbasedonchannelstateofsubcarriers.WeallocatethesubcarrierstotheuserswhohavethebestSNRonthissubcarr