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1、InternationalJournalofComputerNetworks&Communications(IJCNC),Vol.2,No.1,January2010HybridCodingGainandHybridARQBasedonConceptionofMajorityVotingHsin-KunLaiandErl-HueiLuChinMinInstituteofTechnology,ChangGungUniversityNo.110,SyuefuRd.,ToufenTownship,MiaoliCounty,Taiwan351,R.O.C.st259Wen-
2、Hwa1Road,Kwei-Shan,Tao-Yuan,Taiwan333,R.O.C.larry@ms.chinmin.edu.tw,lueh@mail.cgu.edu.twAbstract.Basedontheconceptionofmajorityvoting,ahybridARQschemeforbinarylinearblockcodesoverAWGNchannelispresented.Ateachtransmission,thereceivedwordiskeptinmemorybuffersiferrorsaredetected.Iftherear
3、estillerrorsafteranumberoftransmissions,there-transmissionstopstoimprovethethroughputefficiency.Fromthereceivedwords,thedecodingprocessofproposedhybridARQfirstdetermineseachbitas1or0basedonthemajorityofthecorrespondingbitsinthereceivedwords.Thewordresultingfromvotingisthendecodedbyalge
4、braicdecoderastheoutputcodeword.SimulationresultsshowthattheproposedhybridARQschemeoutperformsARQschemeinbotherror-correctingperformanceandthroughputefficiency,particularlyunderlowSNR.Additionally,acriterionintermsofthroughputandcodinggainisproposedforoverallevaluationofhybridARQscheme
5、scomparedtothatofARQscheme.Comparisonsbetweenplurality-basedhybridARQandmajority-basedhybridARQarealsomadeonthebasisofproposedhybridcodinggain.Keywords:hybridARQ,throughput,majorityvoting,codinggain.1IntroductionBasically,communicationsbetweenpeoplearemisunderstoodbyoneanothermostofthe
6、time.Hence,repetitionsarerequiredforbetterunderstanding.Likewise,askingforre-transmissionindigitalcommunicationisawaytoguaranteereceivingthecorrectinformation,particularlyforsomethingthatcannotbemisinterpretedsuchasmoneytransfer,launchingmissile,operatingnuclearpower.However,timeislimi
7、tedinsomecases.Hence,manyhaveproposeddifferentkindsofstrategytoimprovethethroughputefficiencyofhybridARQ(Auto-RepeatRequest)schemesIngeneral,therearetwomajorprinciplestoimprovethroughputefficiency.Thebestwayistofindathresholdwhichcandiscriminatewithveryhighprobabilitywhetherthereceiv
