Advanced Communication Systems 现代通信系统(双语)Prof. LIU Jiakang 刘家康 教授 Beijing Institute of Technology 北京理工大学 bitliujk163.com 2008.9.Course Brief 课程概要Course Name: Advanced Communication Systems 课程名称：现代通信系统This is a discipline course for the final-year student in Information Engineering major.这是信 息工程专业大四学生的一门专业课。This course will be taught in bilingual. All teaching materials, including lecture notes, homeworks, experiment, examination, will only in English.本课程是双语教学，所有教学材料(包 括课件、作业、实验、考试)均用英语。Course Purpose课程目标To introduce the telecommunication technology介绍通信技术To cover the history of Telecommunication 覆盖通信历史To explain the principle of data transmission 解释数据信号传输原理To illustrate how communication networks are designed 解释通信网络是如何设计的To describe the trend for network convergence 描述网络融合的趋势Textbook 教材Textbook: Tamara Dean, Guide to Telecommunication Technology, CENGAGE (previously Thomson Learning)2003, ISBN 0-619-03547-1 远程通信技术,清华大学出版社影印版，2003年 ,758页,78元,ISBN 7-302-07266-3Website: http:/www.course.com/Extensive Review Questions, hands-on Activities, and Case Projects in each chapter. 每 章后有丰富的复习思考题和实验项目。 References 参考书R.L.Freeman, Fundamentals of Telecommunications, Wiley, 1999G.Kennedy, B.Davis, Electronic Communication Systems, McGraw-Hill, 1993Ray Blake, Electronic Communication Systems (2nd ed) 电子工业出版社，2002年Wayne Tomasi, Electronic Communications Systems (4th ed)电子工 业出版社，2002年Course Evaluation 课程结业方式75% Final Close-book Exam 期末闭卷考试25% Homework, Experiment, Attendance 平时作业、实验、出勤率All work should be written in ENGLISH. 所 有的作业和考试必须使用英文书写提交。Homework and Experiment report should be handed in on the Course website http:/eol.bit.edu.cn/ 作业和实验必须提交 到指定的网站。Course Website 课程的网站Website: http:/eol.bit.edu.cn/ How to log in: lUsername is your student ID No.lPassword is initialized to your class number (such as 01510400)Find the course “现代通信系统” on the site.All 60 students have been registered in the course. You should be able to see the course.Telecommunications OverviewChapter 1Advanced Communication Systems 现 代通信系统(双语)ObjectivesIn this chapter, you will learn to:Define communication and telecommunicationIllustrate components of a communication systemUnderstand the difference between voice, video, and data telecommunicationsDescribe how telecommunication is used in a variety of industriesIdentify careers available to telecommunications professionalsIdentify the organizations responsible for establishing significant telecommunications standards and policiesSection 1.1 What is communication? 什么是通信？The Romans used the Latin word communicare when they meant “to make common, to share, or to impart.”Definition of CommunicationCommunication is the sharing of information or messages between two or more entities.通信的定义通信是指两个或多个实体之间共享信息的过程。Elements of a Communication System 通信系统基本组成SIX elements: 共有六个部分Source - the originator of the message, whether it is a person or machine. 信源Transmitter - the equipment that modifies the message (either data or voice) into the form required for transmission. 发射机Communications channel - the means of carrying the signal from the source to the destination. 信道Elements of a Communication System (cont.)Transmission media - may be physical, like a copper wire or fiber optic cable, or atmospheric, like radio waves. 传输介质Receiver - is the device that captures the message from the communications channel and converts it into a form that the person or machine at the destination can understand. 接收机Destination - the person or machine to whom the message is directed 目的端Elements of a Communication System DiagramFlow of Messages 信息的流向 （工作方式）Simplex - the type of communication in which messages flow in only one direction, from source to destination. 单工Half-duplex communication - occurs when messages travel in both directions between the source and the destination, but in only one direction at a time. 半双工Full-duplex communication - messages can travel over the communications channel in both directions simultaneously. 全双工Flow of MessagesRelative Number of Sources and Destinations 收发端相对数量 （通信方式）One-to-one communication - a single source sends information to a single destination.一对一通信One-to-many communication - a single source simultaneously sends information to multiple destinations.一对多通信Many-to-many communication - occurs when many sources issue messages to many destinations.多对多通信Relative Number of Sources and DestinationsQuick QuizListen to my question carefully.1. True of False2. Fill in the blank3. Fill in the blank4. Fill in the blankSection 1.2 What is Telecommunication? 什么是电信？Communication that spans a distance.Voice telecommunication - using electrical signals to transmit human voice across a distance, such as telephones and radio broadcasts. Video telecommunication - the electrically-based transmission of moving pictures and sound across a distance.Data telecommunication - the use of electrical signals t