基于MATLAB的QDPSK系统仿真设计和实现 计算机科学与技术专业VIP免费

基于MATLAB的QDPSK系统仿真TheSimulationofQDPSKSystemBasedonMATLAB目录摘要..............................................................................................................................IAbstract.....................................................................................................................................II引言..............................................................................................................................1第一章QDPSK的基本原理......................................................................61.1QDPSK的基本原理................................................................................71.1.1QDPSK调制..................................................................................................81.1.2QDPSK解调..............................................................................................10第二章Simulink仿真基础.........................................................................122.1Simulink简介..................................................................................................132.1.1Simulink基本模块库.........................................................................132.1.2Simulink建模仿真的一般过程.............................................142.2Simulink在通信仿真中的应用.................................................15第三章利用Simulink及QDPSK进行系统仿真.....................173.1利用Simulink对QDPSK的系统仿真......................................183.1.1系统总体设计................................................................................183.1.2各个模块的具体设计...........................................................193.1.3系统工作过程的仿真...........................................................203.1.4系统性能的仿真.........................................................................223.2QDPSK的性能比较.............................................................................23结论..........................................................................................................................32参考文献...................................................................................................................33基于MATLAB的QDPSK系统仿真摘要：QDPSK是现代数字通信系统常用的两种调制方式。QDPSK是一种宽带和功率相对高效率的信道调制技术，因此在自适应信道调制技术中得到了较多应用QDPSK意为四相相对移相键控，它是利用前后相邻码元之间的载波相对相位变化来表示数字信息。本设计所用的仿真软件是Matlab自带的仿真软件Simulink。利用Simulink搭建系统仿真模型，详细设置系统参数，对QDPSK系统的工作过程和性能进行仿真分析。Simulink是Matlab最重要的组件之一，它提供一个动态系统建模、仿真和综合分析的集成环境。利用Simulink搭建的仿真模型非常简单并且仿真具有良好的演示效果，为数字通信系统提供了一个较为理想的软件仿真平台。最终得出的仿真结果与理论结果一致，达到了预期的仿真效果。TheSimulationofQDPSKSystemBasedonMATLABAbstract:QDPSKaretwowaysofmodulationformoderndigitalcommunicationsystem.QDPSKisarelativelyhighpowerbroadbandandpowerchannelmodulationtechnique.Asaresult,ithasmanyapplicationsintheadaptivemodulations.ThemeaningofQPSKisquadraturephaseshiftkeying,whichmakesuseofthefourdifferentphasesofthecarriertotransmitinformation.ThemeaningofQDPSKisquadraturedifferentialphaseshiftkeying,whichmakesuseoftherelativephasechangesofthecarrieroftheadjacentcodeelementstotransm...