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1本科生毕业论文（设计）中文题目Turbo码在第三代移动通信中应用英文题目学生姓名班级学号学院专业指导教师职称摘要1摘要Turbo码是应用在CDMA2000系统中的新的纠错编码技术。自从被提出之后，已经从最初的理论研究，发展到成功的应用到第三代移动通信系统当中。Turbo码的纠错性能优于卷积编码，但是译码复杂度高，而且编码时延较大，适用于对时延要求不高的高速数据业务。本文主要介绍了Turbo码的产生背景，研究现状以及应用的领域。掌握了Turbo码编码器的结构和译码器的原理。在无线通信系统中，无线信道的特性对信号传输的影响非常大，本文介绍了无线信道的特性，信道衰落的产生的原因以及CDMA2000系统的空中接口的物理信道，引出了在信道纠错编码领域中一项就有突破性意义的技术，即Turbo码技术。Turbo不仅在信道编码领域凸显出其优异的性能，基于Turbo码的基本思想，尤其是迭代译码的思想，Turbo码与其他技术结合时，可以对整个系统提供更好的性能。还介绍介绍Turbo码在cdma2000中的应用仿真，并对它的性能进行了分析以及在设计Turbo的相关参数时应该注意的问题。最后对本毕业设计做了简要总结及致谢。关键词Turbo码编码译码CDMA2000ABSTRACT1ABSTRACTTurbocodeisanerrorcorrectioncodingtechniquesusedintheCDMA2000system.Sincetheturbocodewasproposed,turbocodehasbeenappliedinthethirdgenerationmobilecommunicatonsystemsuccessfully.ErrorcorrectionperformanceofTurbocodeisbetterthantheconvolutionalencoding.Becauseturbocode’sdecodingishighcomplexityandcodingdelayislong,itisfitfordelaylow-speeddataservices.ThispaperdescribesthebackgroundofTurbocodes,anditstheareasofcurrentresearchingandapplications.IlearntheprincipleofthestructureoftheTurboEncoderanddecoder.Inwirelesscommunicationsystems,radiochannelcharacteristicsofthesignaltransmissionisverylarge.Thisarticledescribesthecharacteristicsofthewirelesschannel,thechannelfadingcausesandCDMA2000airinterfacephysicalchannel.Thereisabreakthroughtechnologyinthefieldofthechannelerrorcorrectioncoding.NotonlyTurbocodereflectsexcellentperformanceinthefieldofchannelcoding,especiallytheideaofiterativedecodingbasedonthebasicideaofTurbocodes,butalsoTurbocodesandothertechnologiescanprovidebetterperformanceintheentiresystem.ThisarticlealsodescribestheapplicationofTurbocodesincdma2000simulation,andmakesperformanceanalysis,anddiscibewhattheproblemshouldbenotedwhenpeopledesigntheTurbo.Finally,Imadeabriefsummaryandthanksinthisgraduation.KeywordsTurbo-codeCodingdecodingCDMA2000system目录1目录第一章绪论..................................................................................................................................11.1第三代移动通信.............................................................................................................11.2Turbo码的起源...............................................................................................................11.3Turbo码研究现状...........................................................................................................21.4Turbo码的应用领域.......................................................................................................3第二章Turbo码编译码原理......................................................................................................52.1编码原理.........................................................................................................................52.2分量编码器和删余器.....................................................................................................62.3交织器.............................................................................................................................82.4解码原理.......................................................................................................................102.5解码算法.......................................................................................................................122.6小结...............................................................................................................................18第三章Turbo码在CDMA2000中的应用..............................................................................193.1无线信道的特性...........................................................................................................193.2CDMA2000系统...........................................................................................................213.3CDMA2000的空中接口...............................................................................................223.4CDMA2000物理信道...................................................................................................243.5CDMA2000中Turbo码的关键技术...........................................................................273.6Turbo码与其他技术的结合.........................................................................................293.7CDMA2000中的Turbo编码器与交织器...................................................................323.8小结...............................................................................................................................37第四章Turbo码的Matlab仿真及其仿真结果分析.............................................................394.1编码约束度对Turbo码性能的影响...........................................................................394.2迭代次数对Turbo码性能的影响.............................................................................404.3交织长度对Turbo码性能的影响...............................................................................414.4码率对Turbo码性能的影响.......................................................................................42结论..........................................................................................................................................44致谢...................................