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1、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
2、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、DSP毕业设计(论文)AbstractIndigitalcommunicationsystems,errorcontrolcodingisusuallyusedtoimprovesystemreliability.SinceP.Eliasputforwardt
3、heconvolutionalcodingthefirsttime,thecodingisstillshowingstrongvitality.,hasbecomewidelyusedinsatellitecommunications,wirelesscommunicationsandmanyothercommunicationsystemsasakindofchannelcodingmethod.suchasGSM,CDMA2000andhasbeenawirelesscommunicationstandardsofIS-95.Inviewoftheerrorproble
4、mintheprocessofN-CDMAdatatransmission,thispaperdiscussestheaimstoimprovethequalityofdatatransmissionofvictordesignthanthedecoder.AlthoughViterbidecodingcomplexityisbigger,moredifficulttoachieve,buthighefficiencyandfastspeed.Sothisarticleemphaticallyanalyzedanddiscussedthe1/2rate(2,1,9)conv
5、olutioncodecodinganditsViterbidecodingalgorithm.In-depthstudyonprincipleofconvolutioncodecodingandViterbialgorithm,proposedtheconvolutioncodecodingandViterbialgorithm(2,1,9)initialization,add-than-chooseandbackdesign,usinglook-uptablemethod,toavoidalargeamountoftediouscalculation,thedecodi
6、ngandquick,goodreal-timeperformanceofthedecoder.MakefulluseoftheseriesofTMS320C54XDSPchip,usingassemblylanguagetocompletethe(2,1,9)convolutioncodecodingandViterbidecodingprocess.Keywords:errorcontrolcoding,convolutionalcode,Viterbidecoding,TMS320C54X毕业设计(论文)目录摘要............................
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