電子通信系統(tǒng)原理

前言

　　ThisnewthirdeditionofPrinciplesofElectronicCommunicationSystemsisfullyrevisedandupdatedtomakeitoneofthemostcurrenttextbooksavailableonwireless,networking,andothercommunicationstechnologies.Becausethefieldofelectroniccommunicationschangessofast,itisanever-endingchallengetokeepatextbookuptodate.Whileprinciplesdonotchange,theiremphasisandrelevancedoastechnologyevolves.Furthermore,studentsneednotonlyafirmgroundinginthefundamentalsbutalsoanessentialunderstandingoftherealwordcomponents,circuits,equipment,andsystemsineverydayuse.Thislatesteditionattemptstobalancetheprincipleswithanoverviewofthelatesttechniques.　　Oneofthemajorgoalsofthislatestrevisionistoincreasetheemphasisonthesystemlevelunderstandingofwireless,networking,andothercommunicationstech-nologies.Becauseoftheheavyintegrationofcommunicationscircuitstoday,theengi-neerandthetechniciannowworkmorewithprintedcircuitboards,modules,plug-incards,andequipmentratherthancomponentlevelcircuits.Asaresult,olderobsoletecircuitshavebeenremovedfromthistextandreplacedwithmoreintegratedcircuitsandblockdiagramlevelanalysis.Modemcommunicationsengineersandtechniciansworkwithspecificationsandstandardsandspendtheirtimetesting,measuring,installing,andtroubleshooting.Thiseditionmovesinthatdirection.Detailedcircuitanalysisisstillincludedinselectedareaswhereitprovesusefulinunderstandingtheconceptsandissuesincurrentequipment.

內(nèi)容概要

本書是關(guān)于通信系統(tǒng)的經(jīng)典著作，全面覆蓋了各種主要的電子通信系統(tǒng)。全書采用豐富的插圖和淺顯的語言描述最新的通信技術(shù)，避免了高深的數(shù)學(xué)公式，特別適合用作大學(xué)本科的通信系統(tǒng)的雙語教材。本書采用國內(nèi)流行的每一章介紹一種主要通信系統(tǒng)的方式，便于學(xué)生自學(xué)以及教學(xué)內(nèi)容的講授。本書共分14章，包括通信系統(tǒng)導(dǎo)論、多路復(fù)用、通信系統(tǒng)中的二進制傳輸、網(wǎng)絡(luò)和局域網(wǎng)導(dǎo)論、傳輸線、天線與電波傳播、因特網(wǎng)技術(shù)、微波通信、衛(wèi)星通信、電信系統(tǒng)、光纖通信、蜂窩電話技術(shù)、無線技術(shù)、通信測試與測量等，最后還給出了部分習(xí)題的答案以及術(shù)語表。    本書可作為通信工程專業(yè)、電子信息工程專業(yè)、信息工程專業(yè)的本科生，以及通信與信息系統(tǒng)、信號與信息處理、電磁場與微波技術(shù)等專業(yè)研究生的教材。

書籍目錄

Preface Chapter 1 Introduction to Electronic Communication   1-1 The Significance of Human Communication   1-2 Communication Systems   1-3 Types of Electronic Communication   1-4 Modulation and Multiplexing   1-5 The Electromagnetic Spectrum   1-6 Bandwidth   1-7 A Survey of Communication Applications   1-8 Careers in the Communication Industry Chapter 2 Multiplexing and Demultiplexing   2-1 Multiplexing Principles   2-2 Frequency-Division Multiplexing   2-3 Time-Division Multiplexing   2-4 Pulse-Code Modulation   2-5 Duplexing Chapter 3 The Transmission of Binary Data in Communication Systems   3-1 Digital Codes   3-2 Principles of Digital Transmission   3-3 Transmission Efficiency   3-4 Modem Concepts and Methods  3-5 Wideband Modula1:ion   3-6 Broadband Modem Techniques   3-7 Error Detection and Correction   3-8 Protocols Chapter 4 Introduction to Networking and Local-Area Networks   4-1 Network Fundamentals   4-2 LAN Hardware   4-3 Ethernet LANs   4-4 Token-Ring LAN Chapter 5 Transmission Lines   5-1 Transmission Line Basics   5-2 Standing Waves 168   5-3 Transmission Lines as Circuit Elements   5-4 The Smith Chart Chapter 6 Antennas and Wave Propagation   6-1 Antenna Fundamentals   6-2 Common Antenna Types   6-3 Radio Wave Propagation Chapter 7 Internet Technologies Chapter 8 Microwave Communication Chapter 9 Satellite Communication Chapter 10 Telecommunication Systems Chapter 11 Optical Communication Chapter 12 Cell Phone Technologies Chapter 13 Wireless Technologies Chapter 14 Communication Tests and Measurements Answers to Selected Problems Glossary

章節(jié)摘錄

　　ThephasedetectorcomparesthephaseoftheincomingPAMsinewavetotheVCOsinewave.Ifaphaseerrorexists,thephasedetectorproducesanoutputvoltagewhichisfilteredtoprovideavaryingdirectcurrent.ThesystemisstabilizedorlockedwhentheVCOoutputfrequencyisidenticaltothatofthesinewavefrequencyderivedfromthePAMinput.Thedifferenceisthatthetwoareshiftedinphaseby90.　　IfthePAMsignalfrequencychangesforsomereason,thephasedetectorpicksupthevariationandgeneratesanerrorsignalwhichisusedtochangethefrequencyoftheVCOtomatch.Becauseoftheclosed-loopfeatureofthesystem,theVCOautomaticallytracksevenminutefrequencychangesinthePAMsignal,ensuringthattheclockfre-quencyusedinthedemultiplexerwillalwaysperfectlymatchthatoftheoriginalPAMsignal.　　TheoutputsignaloftheVCOisappliedtoaone-shotpulsegeneratorwhichcreatesrectangularpulsesattheproperfrequency.Theseareusedtostepthecounterinthedemul-tiplexer;thecountergeneratesthegatingpulsesfortheFETdemultiplexerswitches.　　Asimpler,open-loopclockpulsecircuitisshowninFig.2-19（b）.Again,thePAMsignalisappliedtoanamplifier/limiterandthenabandpassfilter.Thesinewaveoutputofthebandpassfilterisamplifiedandappliedtoaphase-shiftcircuitwhichproducesa90~phaseshiftatthefrequencyofoperation.Thisphase-shiftedsinewaveisthenappliedt　　apulsegenerator,which,inturn,createstheclockpulsesforthedemultiplexer.Onedisadvantageofthistechniqueisthatthephase-shiftcircuitisfixedtocreatea90~shiftatonlyonefrequency,andsominorshiftsininputfrequencyproduceclockpulseswhosetimingisnotperfectlyaccurate.However,inmostsystemsinwhichfrequencyvariationsarenotgreat,thecircuitoperatesreliably.

編輯推薦

　　彩色數(shù)字圖像處理　　納電子學(xué)基礎(chǔ)　　現(xiàn)代電子通信（第9版）　　PIC18微控制器：體系結(jié)構(gòu)、編程與接口設(shè)計（C語言與匯編語言版）　　形態(tài)學(xué)圖像分析：原理與應(yīng)用（第2版）　　超大規(guī)模集成電路互連線分析與綜合　　《電子通信系統(tǒng)原理（第3版）（影印改編版）》特色：　　現(xiàn)代通信系統(tǒng)與數(shù)據(jù)通信和因特網(wǎng)相結(jié)合，反映了最新的發(fā)展方向；　　通信系統(tǒng)的內(nèi)容按照通信方式進行分類，符合國內(nèi)大多數(shù)教材的通行做法；　　專門用一章的篇幅討論無線通信中的天線與電波傳播，對學(xué)生理解實際通信系統(tǒng)有很大的幫助作用；　　無線通信技術(shù)一章總結(jié)介紹了該技術(shù)的最新發(fā)展動向，包括無線局域網(wǎng)、籃牙、WiMAX、RFID、UWB等；　　專門有一章介紹通信測試和測量技術(shù)，對學(xué)生走向工作有幫助。

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