無(wú)線網(wǎng)絡(luò)廣播方式中的網(wǎng)絡(luò)編碼技術(shù)的研究.pdf

1、重慶郵電大學(xué)碩士學(xué)位論文無(wú)線網(wǎng)絡(luò)廣播方式中的網(wǎng)絡(luò)編碼技術(shù)的研究姓名：鄭愛利申請(qǐng)學(xué)位級(jí)別：碩士專業(yè)：通信與信息系統(tǒng)指導(dǎo)教師：姚玉坤；任智201105重慶郵電大學(xué)碩士論文AbstractAbstractAlong蜥t(yī)lltheincreaseofapplicationandlargescaleofwirelessnetworks，howtoimprovethenetworkbandwidthutilizationhasbecomemorea

2、ndmoreimportant，whichpromotesthebirthanddevelopmentofnetworkcodingComparedtotraditionalstore—and—forwardmode，networkcodingisanewkindofmodeoftransmissionwhichencodesthepacketsneededtoforwardinthemiddlenodesandgetsdecodein

3、thereceivingnodesSOastogetthecorrespondinginformationTherefore，networkcodingcanbeappliedonmanyresearchfields，suchashowtoincreasenetworkthroughput，howtomakesecurityofinformationandhowtoimprovetheenergyutilizationandSOonDu

4、etothecharacteristicsofbroadcastinginwirelessnetworks，networkcodingisverysuitableforwirelessnetworksInthispaperWefirstintroducethebasicprincipleofnetworkcodingindetail，thenwedoastudyontheexistingretransmissionapproachnet

5、workcodingretransmissionschemebasedontraversingthereceivingnodesinwirelessnetworks，thekeypointofwhichistocombinemultiplelostpackets、析mnetworkcodingtoachievehi【ghefficientretransmissionHoweverthereexistsomeproblemsaboutth

6、isexistingretransmissionapproaches：(1)thecodingcombinationCannotgetsolvabilitycompletelyinthereceivingnodesandneedsecondaryormultipleretransmissions，whichreducethecodingefficiencyandincreasesthenetworkoverhead(2)onlyifth

7、ecentralnodehasreceivedallthefeedbackinformationaboutpacketlossfrommultiplereceivingnodes，thecodingcombinationcanimplement，whichincreasesthetransmissiondelay(3)Whilereceivingdatapackets，receivingnodesreturnfeedbacktothes

8、endnodewithACKorNACKmessages，whichincreasesthenetworkoverheadToaddresstheproblemsofcodinginsolvabilityandtransmissiondelayweproposeacontinuousnetworkcodingschemebasedonslidingwindowswhichdesignsacodingwindowwhichslidesin

9、chronologicalorderinthematrixofdatapacketswaitingforretransmissionandthedatapacketsusedtoencodearechosenfromthecodingwindowTheproposedschemenotonlyCanreducethenumbersofretransmissionanddelaybutalsoCanensurethesolvability