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1、本科学生毕业论文Turbo码编码算法的研究系部名称:电子工程系专业班级:电子信息06-4班学生姓名:指导教师:职称:讲师黑龙江工程学院二〇一〇年六月TheGraduationThesisforBachelor'sDegreeTheResearchofTurboEncodingAlgorithmCandidate:TianXinguangSpecialty:ElectronicandInformationEngineeringClass:06-4Supervisor:LecturerWangYueyuanHeilongjiangInstituteofTechnology2010-06·Harb
2、in摘要1993年,法国的C.Berrou等人提出了一种新的纠错编码—Turbo码,当交织长度足够长时,其性能接近Shannon信道编码极限值,因此Turbo码的出现,被看作是信道编码理论发展史的一个里程碑,它使人们设计信道编码的方法从增加码的最小汉明距离转向减少低重量码字的个数(错误系数)。本文首先介绍了信道编码理论与技术的发展及Turbo码的研究现状。其次介绍了Turbo码编译码原理,重点研究了Turbo码的编码器结构,系统研究了交织器的原理。最后基于Matlab仿真平台,对交织长度、码率、交织类型等影响Turbo码纠错性能的设计参数进行了计算机仿真,根据仿真结果分析可以得出如下结论:交
3、织长度越长,其纠错性能越好;码率越小,其纠错性能越好。总之,对于Turbo码的选择,应该依据业务的要求,在兼顾传输效率和传输质量的前提下,恰当选择其交织类型、交织长度和码率等设计参数。Ⅰ关键词:Turbo码;交织器;算法;设计参数;误码率ABSTRACTIn1993,anewclassoferror-correctingcodenamedTurbocodeswasproposedbyC.BerrouinFrance,whoseperformancesareclosetotheShannonlimitwhenthedatablocklengthislongenough.Soturbocodei
4、sregardedasthemilestoneinchannelencodingtheoryhistory,whichmakesuscoverttodecreasethenumbersoflightweightcode(errorcoefficient)fromincreasingtheminimumHanmingweigh.ThispaperintroducesthetheoryandtechnologyofchannelcodingofdevelopmentandresearchstatusofTurboyards.SecondlyintroducesTurbodecodingcompi
5、ledcode,focusontheprincipleofTurbocodeisstudied,thesystemstructureofencoderintertwinedwiththeprinciple.Finally,basedonMatlabsimulationplatform,thedesignparametersofTurbodecodingcodeperformancesimulation,includingdesignparametersincludingintertwinedtype,interweavelength,bitrate.Accordingtothesimulat
6、ionresultanalysisconcludesthatinterweaveslength,thelongerthebettertheperformanceofcorrection,Thesmallerthecoderate,thebettertheperformanceoferror.Anyhow,Turbodecoding,thecodeforbusinessrequirements,shouldbebasedonthetransmissionefficiencyandtransmissioninboththequality,underthepremiseofappropriatec
7、hoiceitsinterweave,mixedtypecode-ratelengthandthedesignparameter.Keywords:TurboCode;Interleaver;Algorithm;DesignParameter;BitErrorRateⅡ目录摘要ⅠAbstractⅡ第1章绪论11.1信道编码的发展11.1.1信道编码的发展阶段11.1.2信道编码的分类21.2Shannon理论