扩频通信系统的MATLAB仿真

毕业设计（论文）说明书I扩频通信系统的MATLAB仿真摘要扩频通信，即扩展频谱通信(SpreadSpectrumCommunication)，它与光纤通信、卫星通信，一同被誉为进入信息时代的三大高技术通信传输方式。本文详细阐述了扩展频谱通信的理论基础和实现方法，并通过Matlab对直扩通信系统进行了仿真，并对各基本模块进行设计和仿真。此外，在给定仿真条件下，运行了仿真程序，得到了预期的仿真结果。同时，利用建立的仿真系统，通过对比一般通信系统和基本扩频通信系统的仿真，研究了扩频通信系统抑制信道干扰和码间干扰的性能，结果表明，扩频通信系统确实能很好的提高通信系统的可靠性。关键词：直扩通信；Matlab；Simulink；仿真毕业设计（论文）说明书IISpreadspectrumcommunicationsystemsimulationwithMATLABAbstract.Spreadspectrumcommunication,namelythespreadspectrumcommunication(SpreadSpectrumCommunication),opticalfibercommunicationandsatellitecommunicationistogetherknownasthethreehigh-techcommunicationtransmissionmodeintheinformationage.Thispaperexpoundsthetheoreticalfoundationandrealizationmethodofthespreadspectrumcommunication.BytheMatlabsimulationplatform,spreadspectrumcommunicationsystemissimulated,andeachbasicisdesignedandsimulatedaswell.Inaddition,inagivensimulationconditions,runningthesimulationprogramobtainedtheexpectedsimulationresults.Atthesametime,usingthesimulationsystem,bycomparingthegeneralcommunicationsystemandthebasicspreadspectrumcommunicationsystemsimulation,studiedthespreadspectrumcommunicationsystemtosuppresschannelinterferenceandinter-symbolinterferenceperformance.Theresultsshowedthatthespreadspectrumcommunicationsystemdoesgoodtoimprovethereliabilityofcommunicationsystem.Keywords:DSSScommunication;Matlab;Simulink;Simulation毕业设计（论文）说明书III目录摘要...................................................................................................................IAbstract................................................................................................................II前言..................................................................................................................11绪论..................................................................................................................21.1选题的背景............................................................................................................21.2选题的主要任务....................................................................................................32扩频通信系统...................................................................................................42.1扩频通信的定义....................................................................................................42.2扩频通信的理论基础............................................................................................52.3扩频通信系统的工作原理....................................................................................72.4扩频通信的主要特点............................................................................................82.5扩频通信的主要性能指标................................................................................102.5.1处理增益..........................................................................................................................102.5.2抗干扰容限......................................................................................................................113直接序列扩频通信的性能分析........................................................................123.1直接序列扩频通信系统概述..............................................................................123.2直接序列扩频通信系统的数学模型..................................................................133.3多径干扰..............................................................................................................143.3.1多径干扰的概念..............................................................................................................143.3.2直扩系统的抗干扰性....................................................................................................153.3.3直扩系统的抗截获性....................................................................................................163.3.4直扩码分多址通信系统................................................................................................173.3.5直扩系统的抗多径能力..................................................................................................173.4直接序列扩频通信系统的伪随机码的选择......................................................183.4.1扩频码简介......................................................................................................................193.4.2m序列...............................................................................................................................194直接序列扩频通信系统的仿真基础................................................................254.1Matlab语言与仿真环境介绍...........................................................................254.1.1Matlab仿真环境简述...................................................................................................25毕业设计（论文）说明书IV4.1.2Matlab语言介绍...........................................................................................................264.2基于matlab通信仿真的基本步骤....................................................................274.3Simulink建模仿真的一般过程............................................................................274.3.1Simulink建模仿真的基本步骤.....................................................................................274.3.2Simulink