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摘要我们的生活中,当人们提到通信时,自然会想到传递消息最常用、最方便和最快捷的电话、E-mail、手机等通信方式。在这些通信方式中,是用电信号来传递消息,因而称之为电信。这些产生、传输电信号和在接收端把它恢复为原来的消息的设备的总体,就构成了一个通信系统……从中我们可以看出通信在我们生活中的重要,它给我们带来了各种各样的消息,如果有一天它消失了,我不敢想象世界会变成怎样。在实际的通信中,由于通信业务的多样性,消息的来源也是多种多样的,但基本可以分为两大类:连续的和离散的。连续的消息如话音,声波振动的幅度是随时间连续变化的。若把它转换为随时间连续变化的电压信号,信号幅度是时间连续函数。这样的信号称作模拟信号;什么是模拟通信呢?比如在电话通信中,用户线上传送的电信号是随着用户声音大小的变化而变化的。这个变化的电信号无论在时间上或是在幅度上都是连续的,这种信号称为模拟信号。在用户线上传输模拟信号的通信方式称为“模拟通信”。模拟通信和数字通信的区别具体说就是调制方式不同而已。模拟通信,技术很成熟,就是将模拟信号与载波进行调制,使其带有一定载波特性,又不失模拟信号的独特性,接受端通过低通滤波器,还原初始模拟信号。从宏观看,世界通信方式,仍以电话为主,在电话通信中,则以程控交换和移动电话发展最快。目前模拟通信系统还在使用,但由于人们对各种通信业务的需求迅速增加,数字通信正向着小型化、智能化、高速大容量的方向迅速发展,最终必将取代模拟通信。关键字:通信系统;模拟信号;模拟通信;AbstractInourlife,whenpeoplementioncommunication,willnaturallythinkofthemostcommonlyusedtoimpartinformation,themostconvenientandfastcommunicationsuchastelephone,E-mail,mobilephones.Inthecommunicationmode,iselectricitysignalstosendmessages,socalledtelecom.Thegeneration,transmissionsignalandrestoreitintotheoriginalmessageatthereceivingendofequipment'soverall,constitutesacommunicationssystem...Fromwhichwecanseetheimportantofcommunicationinourlife,itbringsusallkindsofnews,ifitdisappearedoneday,Ican'timaginehowtheworldwillbecome.Intheactualcommunication,duetothediversityofcommunicationbusiness,thesourceofthemessageisalsovaried,butthebasiccanbedividedintotwocategories:continuousanddiscrete.Continuousnews,suchasvoice,acousticvibrationamplitudeiscontinuouschangesovertime.Ifputitintoacontinuousvariationwithtimeofvoltagesignal,thesignalamplitudeisacontinuousfunctionoftime.Suchasignalcalledanalogsignal;Whatiscommunication?Suchastelephonecommunications,usersofonlinetransmissionsignalsisastheuserchangesthesizeofthevoice.Thechangeofelectricalsignalsintimeorinamplitudeiscontinuous,thissignaliscalledanalogsignals.Intheusercommunicationmodeoftheanalogsignallineiscalledthecommunication.Thedifferencebetweenanalogcommunicationanddigitalcommunicationpreciselymodulationinadifferentway.Analogcommunication,technologyismature,isthecarrierwiththeanalogsignalmodulation,makeitscharacteristicswithcertaincarrier,andtheuniquenessoftheanalogsignal,thereceiverthroughalow-passfilter,restoretheoriginalanalogsignal.Fromthemacroscopicworldcommunicationmode,stillgiveprioritytowithphone,intelephonecommunication,theprogram-controlledexchange,andfastestgrowingmobilephone.Analogcommunicationsystemisstillinuseatpresent,butbecauseoftherapidincreaseofpeople'sdemandforavarietyofcommunicationsservicesdigitalcommunicationistowardminiaturization,intelligent,rapiddevelopmentinthedirectionofhighspeedlargecapacity,willeventuallyreplaceanalogcommunication.Keywords:communicationsystem;Analogsignal;Analogcommunication;目录摘要................................................................................................................................1Abstract..........................................................................................................................2第一章Systemview软件使用.....................................................................................51.1Systemview的简介.........................................................................................51.2SystemView用户环境....................................................................................61.2.1设计窗口..............................................................................................61.2.2图标库..................................................................................................7第二章AM系统的仿真................................................................................................92.1AM原理............................................................................................................92.2AM系统仿真..................................................................................................102.2.1参数设置............................................................................................102.2.2仿真结果............................................................................................11第三章DSB系统的仿真.............................................................................................123.1DSB调制解调原理.........................................................................................123.2DSB调制解调仿真.........................................................................................123.2.1参数设置............................................................................................123.2.2仿真结果............................................................................................13第四章SSB系统仿真..................................................................................................154.1SSB相移法基本原理.....................................................................................154.2SSB仿真.........................................................................................................164.2.1参数设置............................................................................................164.2.2仿真结果................................................................................
本文标题:通信原理——基于systemview的模拟通信系统仿真
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