毕业设计（论文）摘要在数字通信系统中，通常采用差错控制编码来提高系统的可靠性。自P．Elias首次提出卷积码编码以来，这一编码技术至今仍显示出强大的生命力。目前，卷积码已广泛应用在无线通信标准中，如GSM，CDMA2000和IS-95等无线通信标准中。针对N-CDMA数据传输过程中的误码问题,本文论述了旨在提高数据传输质量的维特比译码器的设计。虽然Viterbi译码复杂度较大，实现较为困难，但效率高，速度快。因此本文着重分析和讨论了1/2速率的（2,1,9）卷积码编码和其Viterbi译码算法。深入研究卷积码编码原理和Viterbi算法原理后，提出了（2,1,9）卷积码编码以及Viterbi算法的初始化、加—比—选和回溯设计方案，运用查表的方法,避免了大量繁琐计算,使得译码简洁迅速,译码器的实时性能良好。并充分利用TMS320C54X系列DSP芯片，用汇编语言完成了（2,1,9）卷积码编码和Viterbi译码的程序。关键词：差错控制编码、卷积码、Viterbi译码、TMS320C54X、DSPAbstractIndigitalcommunicationsystems,errorcontrolcodingisusuallyusedtoimprovesystemreliability.SinceP.Eliasputforwardtheconvolutionalcodingthefirsttime,thecodingisstillshowingstrongvitality.,hasbecomewidelyusedinsatellitecommunications,wirelesscommunicationsandmanyothercommunicationsystemsasakindofchannelcodingmethod.suchasGSM,CDMA2000andhasbeenawirelesscommunicationstandardsofIS-95.InviewoftheerrorproblemintheprocessofN-CDMAdatatransmission,thispaperdiscussestheaimstoimprovethequalityofdatatransmissionofvictordesignthanthedecoder.AlthoughViterbidecodingcomplexityisbigger,moredifficulttoachieve,buthighefficiencyandfastspeed.Sothisarticleemphaticallyanalyzedanddiscussedthe1/2rate(2,1,9)convolutioncodecodinganditsViterbidecodingalgorithm.In-depthstudyonprincipleofconvolutioncodecodingandViterbialgorithm,proposedtheconvolutioncodecodingandViterbialgorithm(2,1,9)initialization,add-than-chooseandbackdesign,usinglook-uptablemethod,toavoidalargeamountoftediouscalculation,thedecodingandquick,goodreal-timeperformanceofthedecoder.MakefulluseoftheseriesofTMS320C54XDSPchip,usingassemblylanguagetocompletethe（2,1,9）convolutioncodecodingandViterbidecodingprocess.Keywords:errorcontrolcoding,convolutionalcode,Viterbidecoding,TMS320C54X目录TOC\o"1-3"\h\z\uHYPERLINK\l"_Toc422560871"摘要PAGEREF_Toc422560871\h1HYPERLINK\l"_Toc422560872"AbstractPAGEREF_Toc422560872\h2HYPERLINK\l"_Toc422560873"目录PAGEREF_Toc422560873\h3HYPERLINK\l"_Toc422560874"1.绪论PAGEREF_Toc422560874\h1HYPERLINK\l"_Toc4