通信工程专业毕业论文

QAM传输系统的设计与实现南阳理工学院本科毕业设计（论文）QAM传输系统的设计与实现DesignandAchievementOfQAMSystem学院（系）：计算机与信息工程学院专业：通信工程学生姓名：林龙学号：671068014指导教师（职称）：郭常盈（讲师）评阅教师：完成日期：2012年4月南阳理工学院NanyangInstituteofTechnologyQAM传输系统的设计与实现QAM传输系统的设计与实现通信工程专业林龙[摘要]正交振幅调制QAM是一种相位和振幅联合控制的数字调制技术。它应用范围非常广泛，不仅在移动通信领域而且在有线电视传输、数字视频广播、卫星通信等领域都得到广泛应用。本文深入研究QAM调制解调的基本原理、系统结构及性能参数，实现QAM调制解调系统的Simulink仿真及性能分析；详细分析模拟信号数字化的基本理论及实现方法，实现差分脉码调制的Simulink仿真及性能比对；基于上述理论构建模拟信源QAM传输系统，并利用Matlab/Simulink进行建模仿真及性能验证。仿真结果表明，所构建的QAM数字传输系统可以实现模拟信号良好的传输。[关键词]数字传输；正交振幅调制；差分脉码调制；建模仿真DesignandSimulationofQAMSystemCommuncationEngineeringMajorLinLongAbstract:Quadratureamplitudemodulationisajoint-controlleddigitalmodulationtechnologyofphaseandamplitude.Itiswidelyusednotonlyinthemobilecommunicationfield,butalsoinotherfields,suchaswiretelevisiontransmissionfield,digitalvideobroadcasting,satellitecommunication,etc...ThispaperstudiesthebasicprinciplesofQAMmodulationanddemodulation,thensimulatesthewhole16QAMsystemanddiscussesperformancesofsystembythesimulinktoolbox.Thispaperalsoanalysesthebasicprinciplesandimplementationmethodondigitalizinganalogsignals,thensimulatestheDPCMsystemandcontrastsperformancesofsystem.Atlast,thispaperdesignsaQAMtransmissionsystemofanalogsources,thensimulatesthewholetransmissionsystemandcomparingperformancesofsystem.Thesimulationshowsanalogsignalscanbetransmittedcorrectlyinthesystemdesignedinthispaper.Keywords:digitaltransmission;quadratureamplitudemodulation;differentialpulsecodemodulation;modelandsimulateQAM传输系统的设计与实现-I-目录1引言..................................................................................................................................11.1课题研究背景及意义..........................................................................................11.1.1调制在通信系统中的作用.......................................................................11.1.2数字调制解调技术现状与发展...............................................................21.2QAM调制解调技术在数字通信领域的应用优势...............................................21.3仿真软件介绍......................................................................................................31.4论文主要内容及结构安排..................................................................................32QAM调制解调技术研究及Simulink仿真....................................................................42.1QAM调制...............................................................................................................42.1.1QAM调制原理............................................................................................52.1.2QAM调制性能............................................................................................62.1.3QAM星座图................................................................................................72.2QAM解调...............................................................................................................82.3QAM调制解调系统的Simulink仿真.................................................................92.3.116QAM调制解调系统的Simulink仿真..................................................92.3.264QAM调制解调系统的Simulink仿真.................................................112.4MQAM调制解调系统性能仿真分析...................................................................122.4.1频带利用率分析......................................................................................122.4.2误码率分析.............................................................................................132.4.3功率利用率分析.....................................................................................152.5本章小结............................................................................................................153模拟信号数字化研究及Simulink仿真......................................................................153.1脉冲编码调制....................................................................................................163.2差分脉冲编码调制............................................................................................163.2.1DPCM编解码基本原理............................................................................163.2.2最佳预测器.............................................................................................173.2.3DPCM的系统性能分析............................................................................193.3DPCM的Simulink仿真.....................................................................................203.4信道误码对语音质量影响的仿真分析............................................................213.4.1最佳预测器抽头系数的确定.................................................................213.4.2构建测试模型及仿真.............................................................................223.4.3与PCM话音解码对比分析.....................................................................233.5本章小结.............................................................................................................244QAM传输系统的构建与仿真........................................................................................244.1构建QAM传输系统............................................................................................244.1.1模拟信源数字通信系统模型.................