沈阳理工大学学士学位论文PAGELVIIPAGEIV摘要通信系统的设计、实验过程中，通信信号仿真具有灵活性好、经济等诸多优点，为通信系统研究工作带来了极大的方便。本通信仿真平台的任务是对调幅、双边带、单边带、调频、调相五种模拟通信信号的调制和解调进行建模和计算，以及对2ASK，2FSK，2PSK，2DPSK四种数字通信信号的调制和解调进行建模和计算。该仿真平台实现了不同设计参数下各个信号的时域和频域图形的绘制，从而很好的为教学提供了帮助。通信仿真充分考虑了调制样式和噪声大小以及在调制过程中的各种参数对通信信号性能的影响，完成了对模拟以及数字信号建模计算，得到了时域波形和频谱，能够直观的显示各种参数对各种调制样式的通信的影响。本文做了以下工作：以MATLAB为工具，主要应用MATLAB中的GUI（图形用户接口）程序设计，设计实现了一个通信平台，能模拟九种调制信号的产生，传输以及解调接收，实现了在平台上进行参数输入和图形输出的交互功能。关键词：调制；解调；仿真；MATLAB；GUIAbstractInthedesignandtestofthecommunicationsystem,communicatingsignalsimulationpossessesmanyadvantages,suchasgoodflexibilities,economye.g.Andittakesgreatconveniencetotheresearchofcommunicationsystem.Thetargetofthecommunicationsystemflatismodelingandcalculatingtomodulationanddemodulationoffivekindsofsignals:AM,DSB,SSB,FM,PM.Thetaskofthecommunicationsimulationplatformformodelingandcalculationof2ASK,2FSK,2PSK,2DPSKfourdigitalcommunicationssignalmodulationanddemodulation.Thesimulationplatformrealizedthedrawingoftimedomaingraphicsandfrequencydomaingraphicstothedifferentdesignparametersofeachsignal.Communicatingsimulationconsiderstheeffectsofmodulationmode,noiselevelandmodulatingparameterstocommunication,modelingcalculation,creationofthefourtimeperiodswaveformandspectrumdeeplyandwidely.It’sconvenienttodisplayintuitionisticlytheeffectsofparameterstomodulationmodes.Thispapermadethefollowingjob:byusingMATLAB,mainlyusingthetooloftheMATLABgraphicaluserinterface(GUI)programdesign,designedacommunicationplatform,whichcansimulatetheeightkindsofmodulationsignal’sgeneration,transmissionanddemodulationandrealizedtheinputoftheparametersandtheoutputofthegraphics.Keywords:modulation;demodulation;simulation;MATLAB;GUI目录TOC\o"1-3"\h\z\uHYPERLINK\l"_Toc359329336"1绪论PAGEREF_Toc359329336\h1HYPERLINK\l"_Toc359329337"2模拟通信系统基础理论PAGEREF_Toc359329337\h3HYPERLINK\l"_Toc359329338"2.1模拟通信系统概述PAGEREF_Toc359329338\h3HYPERLINK\l"_Toc359329339"2.2模拟通信系统中的线性调制PAGEREF_Toc359329339\h4H