無(wú)線中繼網(wǎng)絡(luò)中網(wǎng)絡(luò)編碼與信道編碼的聯(lián)合設(shè)計(jì).pdf

1、西安電子科技大學(xué)碩士學(xué)位論文無(wú)線中繼網(wǎng)絡(luò)中網(wǎng)絡(luò)編碼與信道編碼的聯(lián)合設(shè)計(jì)姓名：宋光輝申請(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：李穎20090101AbstractThisthesisstudiesindepthonthewirelessnetworkmodeloftwosourcessharingonerelayWeexplorethejointdesignofnetworkcodingandchannelcodingAfteran

2、introductionofrelaycoding，networkcodingandjointnetworkc11lannelcodingsometypicalcodingstrategiesarepresentedThentwonewcodingschemesierelaysoftinformationcodingandrelaycodingdesignusingLDPCcodeareproposedForthesoftinforma

3、tionencoderthisthesisdescribesitscharacteristics，operationprinciple，andwhyitcannotadoptthefeedbackencoderForthedecodingprocess，WefocusonthespecialcalculationoflikelihoodratiosatthereceiverAftercomparisonbetweenthesoftere

4、ncoderandtheordinaryhard—decisionencoderweconcludethatthelatterisaspecialcaseoftheformerandthatsoftencodingcarleliminatetheerrorfloorOnthedesignofLDPCcodesunderrelaychannels，wefixtheLDPCcodesusedatthetwosources，anddesign

5、theoneusedattherelayinordertofindtheoptimumLDPCcodethatmatchesLDPCcodesattheSourcesAfteradetailedintroductionofitSdecodingprocess，ailevolutionprocessoftheextrinsicinformation’Sprobabilitydensityfunctionisdeducedonthebasi

6、softheextantdensityevolutiontheoryofLDPCcodeWealsodevelopitsrelatedGaussianapproximationtheoryAimingathi出rateandlowcomplexitycodes，wedesignthedegreedistributionofrelaycodeusingGaussianapproximationandnonlinearprogramming

7、Throughaneffectivesearchingalgorithm，manyefficientcodesarefoundwhichimprovetheperfo肌anceofthesystemsignificantly、加n1limitedcheckbitsExtensivesimulationsprovethecorrectnessoftheproposedsearchingalgorithmKeywords：relaychan