高速水声通信中OFDM的编码、调制技术与应用研究

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1、分类号UDC密级：编号：工学硕士学位论文高速水声通信中OFDM的编码、调制技术与应用研究硕士研究生：苏军指导教师：乔钢教授学位级别；工学硕士学科、专业：通信与信息系统所在单位：水声工程学院论文提交日期：2008年1月论文答辩日期：2008年3月学位授予单位：哈尔滨工程大学哈尔滨T程大学硕十学位论文宣ii；i；；宣i宣ii；i宣i宣iii；；i；iiiiiiii；宣；i宣；i；i；i；；ii置ii；；暑i宣"／／I；ij宣皇ABSTRACTUnderwateracoustic(UWA)communicationsisarap

2、idlygrowingfieldofresearch，whichoncewasexclusivelymilitary,isextendingintocommercialfield，suchasremotecontrolinoff-shoreoilindustry，pollutionmonitoringinenvironmentalsystems，speechtransmissionbetweendiversetc．Theneedsforunderwaterwirelesscommunicationsareincreased

3、．Sincetheunderwateracousticchannelistemporalandspatialvariabilityandmultipathpropagation，signaldegradationissevere．Inordertoachievehighdataratesontheseverelyband．1imitedUWAchannels，OrthogonalFrequencyDivisionMultiplexing(OFDM)technologywithhighspectrumefficiencysh

4、ouldbeemployed，togetherwiththeband—widthefficientmodulationofsubcarrierandchannelcoding，toimprovethedatarateandreliabilityforUWAcommunication．Themaincontentinthis’paperistheresearchofkeytechniquesofhigh．speedunderwatercommunicationsbasedonOFDM．Themainworkisasfollo

5、ws：1．Thecharacteristiesofunderwateracoustieehannelareintrodueed，andthemainobstaclesinhighdataratecommunicationarestudied．2．Toattainreliablehighdataratetransmitionoverunderwateracousticchannels。highband．widthefficientmodulationofsubcarrieronOFDMarestudied．Inorderto

6、findamodulationtechnologywithhighspectrumefficiency，largecapability，strongabilityofovercomingmulti。pathandimpulsenoiseandefficientutilizationofpower．3．TheprincipleperformanceandarithmeticofcodinganddecodingofRScode、convolutionalcode，turbocode，serialRSconcatenatedc

7、onvolutionalcodeandtrelliscodedmodulationarestudied．AndthesimulationresultsunderthemodelofUWAchannelaregiven．4．Experimentinpondismadetovalidatetheperformanceofalgorithms．Checkingtheperformanceofdifferentchannelcodingandmodulation哈尔滨工稗大学硕十学位论文technologiesinUWAcommu

8、nicationsismainintension．Thebitoferrorratesiscommonly10．2withoutchannelcodingandcanbegreatlyreducedbyusingthechannelcodingproposedinthispaperintheexperi