2023年全國碩士研究生考試考研英語一試題真題(含答案詳解+作文范文)_第1頁
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1、浙江大學(xué)博士學(xué)位論文全數(shù)字接收機(jī)理論與VSB調(diào)制在HDTV中應(yīng)用和實(shí)現(xiàn)的研究姓名:張朝陽申請(qǐng)學(xué)位級(jí)別:博士專業(yè):通信與電子系統(tǒng)指導(dǎo)教師:仇佩亮19980901ABSTRACTABSTRACTDigitalmodulationanddemodulationisoneofthemostimportanttechnologiesappliedintransmissionsystemsItcontainsthreemajorsubjects;s

2、ignaling,estimationanddetectionThechannelconditionsofrealtransmissionsystemsareusuallyverycoarseformultilevelmodulationschemes,SOalgorithmsandarchitecturesusedforthemodulationanddemodulationshouldbecarefullyconsideredIt’

3、SoneoftheeffortsexhibitedinthispapertoapplyappropriatealgorithmsandarchitecturestomeettheneedoftransmissionrequirementsandehannelconditionsEarlymodemswereoftenimplementedwithmanyanalogpartsUnderthiscircumstance,someprobl

4、emswouldemerge,suchasnoiseinterference,nonlinearity,levelmismatchingandresistancemismatchingaswellasthermalunreliabilityTheywouldcauserelativelylargeimplementationlossSurelythisisdisadVantageousforrealapplicationDigitali

5、mplementationofmodemsisthetrendsofmodernmodulationtechnologyForareceiver,digitalimplementationmeansoneshouldsolvetheproblemofdefiningexplicitreceiverarchitecture,ofestimationofidealsampleinstantsunderasynchronoussampling

6、,ofestimationofsynchronizationparameterunderthesamecondition,ofthoseresultedwiththesamplingandquantizationprocessAlldigitalreceivertheoryisthemainresearchgoalofthispaperHereinthispaper。8VSBmodulationusedforHDTVterrestria

7、IbroadcastingStheresearchtargetAfterashortsurveyofthedevelopmentofmodulationtechnologyfirstthispapercomparedtheerrorperformanceof8VSBwith64QAM,andstudiedthekeyproblemsembeddedwithin8VSBmodulationschemewhichiSsuitedforHDT

8、VterrestriaIbroadcastingItproposedanalldigitalimplemented8VSBmodulatorscheme,thealgorithmsandarchitecturesoftimingrecoveryloopandcarrierphasetrackerItalsoprovidedtheanalyticalresultsofsystemperformanceandtheimplementatio

9、nresultsofmodulatorandcarrierrecoveryloopSecond,thispaperstudiedthebasictheoryandimplementationmethodologyofalldigitalreceiverItpresentedtWOkindsofarchitectures;oneisfeedbackwhiletheotheriSopenloopItstudiedaseriesofprobl

10、emscausedwithinthesamplingandquantizationprocess,includingIFconfiguration,quantizationprecision,DCremovalI/Qmisalignmentanditscorrection,etcAfterthatitfocusedontherelativelyprioreropenloopalldigitalreceiverandstudiedther

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