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ID:33921133
大小:2.47 MB
页数:49页
时间:2019-03-01
《无线体域网的信道接入和资源分配关键技术-研究》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、浙江工业大学硕士学位论文RESEARCHONKEYTECHNOLOGIESOFCHANNELACCESSANDRESOURCEALLOCATIONFORWIRELESSBODYAREANETWORKSABSTRACTWirelessbodyareanetwork(WBAN)isanetworkcomprisedofwearableorimplantedsensorsaroundorinsidehumanbody.Inthisdissertation,wefocusonthekeytechnologiesofchannelaccessandresourcealloca
2、tionissuesinWBAN.First,IEEE802.15.6isacommunicationstandarddevelopedforWBAN.Modelingandanalysisofthestandardisfavorabletoperformanceforecastandsystemoptimization.Second,changesofthebodypostureorpositionwillincurshadeeffectbetweensensornodesandthecoordinatorandthusleadtopackettransmissi
3、onfailure.Itisthereforeindispensabletodesignatransmissionstrategythatcanadapttothetime-varyingchannelquality.Third,WBANsaregenerallydenselydistributed.InterferencefromcoexistingnearbyWBANscouldcausenetworkperformancedegradation.Itisthereforeessentialtostudyhowtoallocatethepowerresource
4、samongdifferentWBANssoastoensureQoSofdifferentdatapriorities.Basedontheabove-mentionedissues,themajorworkofthisdissertationisasfollows:1.TounderstandtheintrinsicnatureofIEEE802.15.6communicationstandarddesignedforWBAN,theCSMA/CAchannelaccessmechanismundersaturationconditionismodeledbyM
5、arkovchaintoanalyzethethroughput,successfulpacketdeliveryrate,anddelay.Simulationresultsconfirmtheaccuracyofthemodelanalysis.Bothanalysesandsimulationresultsshowthatthisstandardnotonlyprovidesdifferentiatedservicefordifferentprioritiesbutalsoindicatesthatundersaturationconditionthemedi
6、umismostlypreemptedbythehighestpriority,whilestarvingotherpriorities.2.Toadapttotime-varyingcharacteristicofthechannelquality,abursttransmissionstrategyisproposedwhichforecaststhenumberofredundanttransmissionsbasedonchannelestimation.Theenergyconsumption,successfulpacketreceptionratean
7、dthetransmissiondelayundertheproposedstrategyareanalyzed.Simulationresultsshowthattheproposedtransmissionstrategyeffectivelyreducestheenergyconsumptionandtransmissiondelaywhichstillmaintainsthereliabilitycomparedwithtraditionaltransmissionmethod.3.Tosolvetheinter-WBANinterferenceprob
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