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WCDMA系统中的Turbo码译码算法研究与实现的中期报告 Abstract Withtheincreasingdemandforhigh-speedwirelessdatatransmission,thedevelopmentofwirelesscommunicationtechnologyhasbecomeincreasinglyimportant.Turbocodingisakeytechnologyinwirelesscommunicationsystems,whichcangreatlyimprovethetransmissionperformanceandreliabilityofwirelesscommunicationsystems.ThisreportaimstostudyandimplementtheturbodecodingalgorithmintheWCDMAsystem.Themaincontentsincludetheintroductionofturbocodingtheoryandturbodecodingalgorithm,theimplementationofturbodecodingalgorithmbasedonBCJRalgorithmandMAPalgorithm,simulationandverificationofturbodecodingalgorithmbasedonMATLABsoftware. Introduction IntheWCDMAsystem,theuseofturbocodingcaneffectivelyimprovethesystem'santi-interferenceability,transmissionefficiencyanderrorcorrectionability.Theturbodecodingalgorithmisthekeytorealizethedecodingofturbocodes.Inthisreport,wemainlystudyandimplementtheturbodecodingalgorithmintheWCDMAsystem,andanalyzetheperformanceofturbocodes. Content 1.Introductiontoturbocodingtheory 1.1Principleofturbocoding 1.2Turboencoderstructure 1.3Turbodecodingalgorithm 2.Turbodecodingalgorithmimplementation 2.1BCJRalgorithm 2.2MAPalgorithm 3.Simulationandverificationofturbodecodingalgorithm 3.1Simulationenvironmentandparameters 3.2Simulationresultsanalysis Conclusion Inthisreport,wehavestudiedandimplementedtheturbodecodingalgorithmintheWCDMAsystem,andanalyzedtheperformanceofturbocodes.ThesimulationresultsshowthattheturbodecodingalgorithmbasedonBCJRalgorithmandMAPalgorithmcaneffectivelyimprovethedecodingperformanceofturbocodes.Infuturework,wewillfurtherstudytheoptimizationofturbodecodingalgorithmstoimprovetheanti-interferenceabilityanddecodingefficiencyofwirelesscommunicationsystems.