基于Matlab的数字基带传输系统的仿真

课程设计(论文)说明书题目：基于Matlab的数字基带通信系统仿真院（系）：信息与通信学院专业：通信工程学生姓名：黄志忠学号：1000210217指导教师：闫坤职称：讲师2013年12月1日桂林电子科技大学课程设计（论文）报告用纸第1页共3页摘要本论文主要研究了数字信号的基带传输的基本概念及数字信号基带传输的传输过程和如何用MATLAB软件仿真设计数字基带传输系统。本文首先介绍了MATLAB仿真软件。然后介绍了本课题的理论依据，包括数字通信，数字基带传输系统的组成及数字基带信号的传输过程。接着介绍了数字基带传输系统的特性包括数字PAM信号功率普密度及常用线路码型，并通过比较最终选择双极性不归零码。之后介绍了数字基带信号的最佳接收的条件以及如何通过示波器观察基带信号的波形。最后按照仿真过程基本步骤用MATLAB的仿真工具实现了数字基带传输系统的仿真过程，对系统进行了分析。关键字：数字基带传输系统MATLAB计算机仿真；桂林电子科技大学课程设计（论文）报告用纸第2页共3页AbstractThispapermainlystudiesthebasebandtransmissionofdigitalsignalandthebasicconceptofbasebandtransmissionofdigitalsignalinthetransmissionprocessandhowtouseMATLABsoftwaretodesignandSimulationofdigitalbasebandtransmissionsystem.ThispaperfirstintroducesMATLABsimulationsoftware.Thenintroducesthetheoreticalbasis,includingdigitalcommunication,digitalbasebandtransmissionsystemanddigitalbasebandsignaltransmissionprocess.ThenitintroducesthecharacteristicsofdigitalbasebandtransmissionsystemincludesthedigitalPAMsignalpowerspectrumdensityandcommonlyusedlinecode,andthroughthecomparisonofthefinalchoiceofbipolarnrz.Afterintroducingthedigitalbasebandsignalreceivedbythebestconditionsandhowthebasebandsignalwaveformoscilloscopeobservation.Finally,inaccordancewiththebasicstepsofsimulationprocessusingMATLABsimulationtooltoachievethedigitalbasebandtransmissionsystemsimulationprocess,hascarriedonthesystemanalysis.Keywords：DigitalBaseBandTransmissionSystemComputersimulation桂林电子科技大学课程设计（论文）报告用纸第3页共3页目录引言.........................................................11MATLAB软件简介.............................................21.1MATLAB的基本知识........................................................................................................21.2Matlab语言的特点............................................................................................................31.2.1编程效率高.......................................................................................................................31.2.2用户使用方便...................................................................................................................31.2.3扩充能力强.......................................................................................................................31.2.4语句简单、内涵丰富.......................................................................................................31.2.5高效方便的矩阵和数组运算...........................................................................................31.2.6方便的绘图功能...............................................................................................................42数字基带传输系统仿真........................................42.1数字基带传输系统的介绍.................................................................................................42.2软件的主要功能.................................................................................................................52.3数字基带信号.....................................................................................................................52.3.1数字基带信号的要求.......................................................................................................52.3.2数字基带信号...................................................................................................................62.3.3常用的基带传输码型.......................................................................................................72.4实验原理...........................................................................................................................102.4.1数字通信系统模型.........................................................................................................102.4.2数字基带传输系统模型.................................................................................................103实验内容...................................................113.1余弦滚降基带传输系统...................................................................................................113.1.1余弦滚降系统仿真源程序及结果.................................................................................113.2眼图的仿真实现...............................................................................................................133.2.1眼图的介绍.....................................................................................................................133.2.2升余弦滚降系统眼图仿真程序.....................................................................................133.2.3升余弦滚降系统眼图的仿真结果.................................................................................154总结.......................................................154.1存在的问题.......................................................................................................................154.2心得体会...........................................................................................................................15谢辞........................................................17参考文献......................................................18桂林电子科技大学课程设计（论文）报告用纸第1页共18页引言随着通信系统的规模和复杂度不断增加，通信系统的设计方法已经不能适应发展的需要，通信系统的模拟仿真技术越来越受到重视。传统的通信仿真技术主要分为手工分析与电路试验两种，但耗时长，方法比较繁杂，而通信系统的计算机模拟仿真技术是介于上述两种方法的一