通信原理

前言

　　In recent years， communication theory and technology has witnessed rapid development. In China， the application of telecommunication service has penetrated into almost every household and every person. The huge modern communication networks have been one of the important infrastructures in China. Correspondingly， the amount of telecommunication enterprises and employees there has also been increasing remarkably. Under this situation， the education of the new specialized personnel in the telecommunication field and the reeducation of the personnel in service have become important tasks. In addition， bilingual teaching is a new requirement in Chinese institutions of higher learning， and its importance has been recognized by more and more people. However， there is lack of appropriate textbooks in English on communication theory for Chinese students. This textbook is intended to accommodate the demand.　　The current communication networks in China have almost all been digitized. Signals transmitted in China s public communication networks are mainly digital ones; only the signals transmitted in　　the users loop and those signals for special applications are still analog. Hence， the discussion of　　analog signal transmission techniques is limited to a minimum， and the greater part of this book is devoted to discussions of digital communication including transforming， encoding and transmission of digital signals， as well as the digitization of analog signals.　　In the discussion on digital communication technology， some new communication technologies have been emphasized， for example， trellis code modulation （TCM）， orthogonal frequency division modulation （OFDM） ，multiple access， spread spectrum， TURBO code， and， so on. Attention has been directed to the explanations that are associated with the application examples of the currently rapidly developed networks， such as satellite communication and computer communication networks， and so on.

內(nèi)容概要

On the basis of introducing the
principles of analog communication, the book is focused on the
principles of digital communication, and describes the
communication system cotitute, the specificatio, the operation
principles, the performance analysis, and the design methods. New
communication systems and technologies developed recently are
emphasized. The book is suitable for electronic specialties of
engineering school in Chinese general ititutio of higher learning
as the textbook or reference for the junior and senior students and
graduate students, and can also be used as a reference book or a
textbook in the advanced study classes for the engineering and
technical peonnel engaged in communication engineering.

作者簡(jiǎn)介

1952年畢業(yè)于北京大學(xué)，現(xiàn)任西安電子科技大學(xué)教授、博士生導(dǎo)師、中國(guó)通信學(xué)會(huì)理事、中國(guó)電子學(xué)會(huì)學(xué)術(shù)工作委員會(huì)委員。先后被評(píng)選為中國(guó)通信學(xué)會(huì)會(huì)士、中國(guó)電子學(xué)會(huì)會(huì)士、(美國(guó))電氣電子工程師學(xué)會(huì)會(huì)士(IEEE
Fellow)、(英國(guó))電氣工程師學(xué)會(huì)會(huì)士(IEE
Fellow)。曾發(fā)表過(guò)通信工程領(lǐng)域?qū)W術(shù)論文100余篇，著譯10余本。其中《通信原理》(1980年)一書(shū)曾獲電子工業(yè)部?jī)?yōu)秀教材特等獎(jiǎng)、國(guó)家教委優(yōu)秀教材獎(jiǎng)。

書(shū)籍目錄

PART Ⅰ
Chapter 1  Introduction
  1.1  Historical Review of Communication
  1.2  Message, Information, and Signal
  1.3  Digital Communication
    1.3.1  Basic Concept
    1.3.2  Advantages of Digital Communication
    1.3.3  Digital Communication System Model
    1.3.4 Specificatio of Digital Communication System
  1.4  Channel
    1.4.1  Wireless Channel
    1.4.2  Wired Channel
    1.4.3  Channel Models
    1.4.4  Influence of Channel Characteristic on Signal Tramission
  1.5  Noise in Channel
  1.6  Brief Summary
  Questio
  Exercises
Chapter 2  Signals
Chapter 3  Analog Modulation System
Chapter 4  Digitization of Analog Signal
Chapter 5  Representation and Tramission of Baseband Digital Signal
Chapter 6  Elementary Digital Modulation System
Chapter 7  Synchronization
    PART Ⅱ
Chapter 8  Optimum Reception of Digital Signal
Chapter 9  Multiplexing and Multiple Access
Chapter 10  Channel Coding and Error Control
Chapter 11  Advanced Digital Bandpass Modulation and Demodulation
Chapter 12  Information Theory
Chapter 13  Communication Networks
Chapter 14  Communication Securtity
Appendix
Abbreviatio
Glossary
References
Index

章節(jié)摘錄

　　The above equation shows that if two arbitrary random variables in the Gaussian process are uncorrelated to each other， and then the n-dimensional joint probability density is equal to the product of each one dimensional probability density. The random variables which satisfy this condition are regarded statistically independent （ to one another）. Let us reiterate if the cross-correlation function of the two random variables equals O， then they are regarded as bing uncorrelated to each other; if the two dimensional joint probability density of the two random variables is equal to the product of the one dimensional probability densities， then it is regarded independent of each other. Two uncorrelated random variables are not always independent of each other; and the two independent random variables are certainly uncorrelated.　　We have proved in the above paragraph that random variables of the Gaussian process are uncorrelated and independent of one another. We shall only further discuss the characteristics of one dimensional Gaussian process as follows.

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