提高无线mesh网多播纠错机制效率的分析

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1、AbstractABSTRACTBecauseoftherapiddeVelopmentofwirelesstechnical，VariousofwirelessmulticaStapplications印pearance，andmanyofthemhaVestrictlyconStraintsoft砌smissiondelayande11rorrate．Italwayshasconflictbetweenmeapplicationrequirementsandwirelessnetworks’unstablebandwidthaswellasopencom

2、municationenvironment．Becauseofthese，itisVeryinlportanttodosomeresearchesonreliableandspeedywirelessnetworksmulticastprotoc01．ThewirelessmeshnetworkshaSalargeimproVementofnetworkcoVeragearea，robustnessaJldnexibilit)，thanthewirelesslocalareanetWorks．Thewirelessmeshnetworksisakindofm

3、uti-hopandselfo唱anizationnetworks，hasbec锄eaVeryprospectwirelessnetworkingteclul0109y．Ithasalotoferrorcorrectionprotocolsinwirelessmeshnetworks’application1ayerandotherhi曲erlayers．W色alll(nowthatprotocolinhighlayersneedslongertimethaninlowerlayers，themostimportantpointismathighprotoc

4、ollayers’timedelaycannotbedealtwithbyimproVe也eprotoc01simply．SosomeotherresearchershaVedonemanyworksinMAClayer’serrorcontrolprotocols，wewillcontinuetousethiswayinourresearchworks．Theobjectiveofthisthesisistofindoutaspeedyandreli￡出1ewaytodomuticaste玎or-correctioninwirelessmeshnetwor

5、ks．Themaiorworksareasfollows：Firstly，byresearchingtheexitingerror-correctionprotocols，wenndoutmekeyproblemswhich1eadtohightimedelay：atomisticfo刑ard，competitionforchannel(HouGuall一Bo，YangShou-BaoandHuYun，20l0)，transmissionredundaJlcyandsoon．Secondly，todealwimthechannelcompetitionaIl

6、dtransmissionredundancyproblems．Weusechipsequencestocodingthedata(chipsequenceisaspecialkindofvector，thesevectorsaremutuallyorthogonalandtheValueofelementsis1or0)，sothatdatatransmissions矗omneighbornodescansharethechaI】盼elwitheachothers．Meanwhile，anode’sdatatransmissionwillnotinnuen

7、ceothernodes．Thirdly，byusingtheinfomlation矗omomerprotocollayerstoselectoutoneofmet、Ⅳ0redundancyprocessalgorithmsaccordingtothenetworktopology．TheMatrixBased‘nansmissionRedundancyProcessissuitabletothesmalltopology．Othe州ise，using廿1eProbabilityBasedTraJlsmissionRedundancyProcess．TTTA

8、bstracC———————————————————