數(shù)字電視在時變信道中移動接收問題的研究以及高清晰度電視音頻編碼器的設計與實現(xiàn).pdf

1、上海交通大學博士后學位論文數(shù)字電視在時變信道中移動接收問題的研究以及高清晰度電視音頻編碼器的設計與實現(xiàn)姓名：沈宇鍵申請學位級別：博士后專業(yè)：通信與信息系統(tǒng)指導教師：余松煜20021001AbstractTheoutlineofthistechniquereportisasfollowsSectionIcommenceswithreceptionperformanceofHDTVtransmissionsystemonthetime。di

2、spersivemultipathchannelSectionIIisthedesignandimplementationofreal—timeaudioencoderinHDTVInsectionI，propagationcharacteristicofHDTVbroadcastchannelinfuturearediscussed，andtheperformanceofOFDMsystemonthewidesensestationa

3、ryscattering(WSSUS)Raylei曲fadingchannelisinvestigatedSimulationandanalysisarealsodonetoevaluateDVB—TsysteminmobilereceptionenvironmentAchannelmodel(GWSSUS)adaptedforbroadbandmobileradiochannelisdescribedinthissectionSimu

4、lationofODFMandDVB—T2ksystemisimplementedwiththiskindofchannelmodelThesimulationresultsshowthatbiterrorrate210。canbeachievedattransmissionspeed10Mbit／swithin8MHzVHF／UHFbandwidthwiththislowcomplexitychannelestimationappro

5、achandchannelencodingSimulationresultsalsoshowthatDopplershiftsarenotadominantfactorthatdeterioratesmobilereceptionperformanceofHDTVtransmissionsystemInsectionII，implementationissuesoftherealtimeMPEG2audioencoderwithimpr

6、ovedcodingalgofithminHDTVarepresentedandhardwarearchitectureisdescribedTheencoderismadeupreal—timeencodingpartsandPESpacketizationpansInreal—timeencodingpart，animprovedcodingmethodsofgracefullydegradingaudiosignalquality

7、forfasterencodingspeedisproposedandrealizedinasinglefix—pointDSP，whichalsocarryoutbitallocation，quantizationandbitstreamformatting，etcPESpackefizationofMPEG2andDolbyAC3iscomplementedwithVHDLdescriptiontoimplementelementa

8、rystreamstransformingtransportstreamThefinalimplementationsuccessfullypassesISO／IECMPEG一2audiocompliancetestsandachievesnearcransparentaudiosignalreconstructionKeywords：OFDMTime—DispersiveMultipathChanneHDTVAudioEncoderM