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1 Introduction to Communications Systems 1

1．1 Introduction 3

1．2 Elements of a Communication System 3

1．3 Time and Frequency Domains 8

1．4 Noise and Communications 16

1．5 Spectrum Analysis 30

2 Radio-Frequency Circults 43

2．1 Introduction 44

2．2 High-Frequency Effects 44

2．3 Radio-Frequency Amplifiers 48

2．4 Radio-Frequency Oscillators 60

2．5 Mixers 74

2．6 Frequency Synthesizers 83

3 Amplitude Modulation 101

3．1 Introduction 102

3．2 Full-Carrier AM: Time Domain 105

3．3 Full-Carrier AM: Frequency Domain 110

3．4 Quadrature AM and AM Stereo 118

3．5 Suppressed-Carrier AM 120

4 Angie Modulation 135

4．1Introduction 136

4．2 Frequency Modulation 137

4．3 Phase Modulation 141

4．4 The Angle Modulation Spectrum 145

4．5 FM and Noise 155

4．6 FM Stereo 161

4．7 FM Measurements 163

5 Transmitters 171

5．1 Introduction 172

5．2 Transmitter Requirements 172

5．3 Transmitter Topologies 175

5．4 Full-Carrier AM Transmitters 177

5．5 Single-Sideband Am Transmitters 191

5．6 FM Transmitters 200

5．7 Transmitter Power Measurements 212

6 Receivers 223

6．1 Introduction 224

6．2 Receiver Topologies 225

6．3 Receiver Characteristics 230

6．4 Demodulators 240

6．5 Receiver Variations 252

6．6 Communications Receivers 263

6．7 Transceivers 266

6．8 Receiver Measurements 266

7 Digital Communication 279

7．1 Introduction 280

7．2 Pulse Modulation 286

7．3 Pulse-Code Modulation 291

7．4 Delta Modulation 298

7．5 Line Codes 299

7．6 Time-Division Multiplexing 300

7．7 Vocoders and Data Compression 302

8 The Telephone System 311

8．1 Introduction 312

8．2 Public Switched Telephone Network 312

8．3 The Local Loop 315

8．4 Signals and Noise in the Telephone System 322

8．5 Frequency-Division Multiplexing 324

8．6 Digital Transmission 328

8．7 Telephone-Network Signaling 331

8．8 Digital Local Loops 333

9 Data Transmission 341

9．1 Introduction 342

9．2 Data Coding 342

9．3 Asynchronous Transmission 348

9．4 Synchronous Transmission 351

9．5 Error Detection and Correction 354

9．6 Data Compression and Encryption 359

10 Local-Area Networks 367

10．1 Introduction 368

10．2 Local-Area Network Topologies 368

10．3 IBM Token-Ring System 371

10．4 Ethernet 373

10．5 Ethernet Wiring 376

10．6 Broadband Networks 379

10．7 LAN Software 380

11 Wide-Area Networks and the Internet 385

11．2 Network Structures 386

11．1 Introduction 386

11．3 Network Protocols 388

11．4 Connecting LANs to WANs 390

11．5 TCP-IP Networks 392

11．6 The Internet and Intranets 394

11．7 Convergence of Voice and Data Networks 396

12 Digital Modulation and Modems 403

12．1 Introduction 404

12．2 Frequency-Shift Keying 408

12．3 Phase-Shift Keying 411

12．4 Quadrature Amplitude Modulation 412

12．5 Telephone Modems 413

12．6 Modem-to-Computer Connections 418

12．7 Cable Modems and Digital Subscriber Lines 423

13 Multiplexing and Multiple-Access Techniques 435

13．1 Introduction 436

13．2 Frequency-Division Multiplexing and Multiple Access（FDM/FDMA） 437

13．3 Time-Division Multiplexing and Multiple Access （TDM/TDMA） 438

13．4 Spread-Spectrum Systems 443

13．5 Code-Division Multiple Access（CDMA） 448

14 Transmission Lines 455

14．1 Introduction 456

14．2 Electrical Model of a Transmission Line 458

14．3 Step and Pulse Response of Lines 459

14．4 Wave Propagation on Lines 470

14．5 Transmission Line Losses 482

14．6 Impedance Matching 484

14．7 Transmission-Line Measurements 499

15 Radio-Wave Propagation 513

15．1 Introduction 514

15．2 Electromagnetic Waves 516

15．3 Free-Space Propagation 520

15．4 Reflection, Refraction,and Diffraction 527

15．5 Ground-Wave Propagation 533

15．6 Ionospheric Propagation 534

15．7 Line-of-Sight Propagation 538

15．8 Propagation in a Mobile/Portable Environment 542

15．9 Repeaters and Cellular Systems 546

15．10 Other Propagation Podes 552

16 Antennas 561

16．2 Simple Antennas 562

16．1 Introduction 562

16．3 Antenna Characteristics 566

16．4 Other Simple Antennas 576

16．5 Antenna Matching 584

16．6 Antenna Arrays 587

16．7 Reflectors 596

16．8 Cellular and PCS Antennas 600

16．9 Test Equipment : The Anechoic Chamber 607

17 Microwave Devices 617

17．1 Introduction 618

17．2 Waveguides 618

17．3 Passive Components 632

17．4 Microwave Solid-State Devices 639

17．5 Microwave Tubes 646

17．6 Microwave Antennas 651

17．7 Radar 656

18 Terrestrial Microwave Communication Systems 673

18．1 Introduction 674

18．2 Terminal and Repeater Siting 675

18．3 Path Calculations 678

18．4 Fixed Microwave Links 685

18．5 Local Microwave Distribution Systems 692

19 Television 699

19．1 Introduction 700

19．2 NTSC Analog Video Signal 701

19．3 Terrestrial Analog Television Broadcasting 710

19．4 Analog Television Receivers 715

19．5 Cable Television 727

19．6 Test Equipment and Signals 732

19．7 Television Receiver Troubleshooting 734

19．8 Digital and High-Definition Television 736

20 Satellite Communication 749

20．1 Introduction 750

20．2 Satellite Orbits 753

20．3 Geostationary Satellites 756

20．4 Applications of Geostationary Satellites 770

20．5 Satellites in Low-and Medium-Earth Orbits 779

20．6 Satellite Telephone Systems Using LEO and MEO Satellites 780

21 Cellular Radio 791

21．1 Introdcution 792

21．2 The Advanced Mobile Phone System（AMPS） 793

21．3 AMPS Control System 796

21．4 Security and Privacy 800

21．5 Cellular Telephone Specifications and Operation 801

21．6 Cell Site Equipment 803

21．7 Fax and Data Communication Using Cellular Phones 811

21．8 Digital Cellular Systems 813

22 Personal Communication Systems 825

22．1 Introduction 826

22．2 Differences Between Cellular and PCS Systems 827

22．3 IS-136（TDMA）PCS 830

22．4 GSM 832

22．5 IS-95 CDMA PCS 835

22．6 Comparison of PCS Schemes 843

22．7 Data Communication with PCS 845

22．8 Testing Cellular Systems and PCS 848

22．9 Third Generation PCS Systems 850

23 Paging and Wireless Data Networking 859

23．1 Introduction 860

23．2 Paging and Messaging Systems 860

23．3 Wireless Local-Area Networks 865

23．4 Wireless Packet-Data Services 875

24 Fiber Optics 881

24．1 Introduction 882

24．2 Optical Fiber 883

24．3 Fiber-Optic Cables 894

24．4 Splices and Connectors 895

24．5 Optical Couplers and Switches 898

24．6 Optical Emitters 901

24．7 Optical Detectors 908

25 Fiber-Optic Systems 917

25．1 Introduction 918

25．2 Basic Fiber-Optic Systems 918

25．3 Repeaters and Optical Amplifiers 925

25．4 Wavelength-Division Multiplexing 928

25．5 Submarine Cables 929

25．6 The Synchronous Optical Network （SONET） 931

25．7 Fiber in Local-Area Networks 933

25．8 Local Telephone Applications 935

25．9 Cable-Television Applications 937

25．10 Experimental Techniques 938

25．11 Optical Time-Domain Refiectometry 939

APPENDICES 945

APPENDIX A Decibels 945

A．1 Review of Logarithms ·A.2 Decibels 945

APPENDIX B CB Channel Frequencies 951

APPENDIX C Television Channel Frequencies 952

APPENDIX D Cable-Television Frequencies 953

APPENDIX E Waveguide Table 955

APPENDIX F Callular and PCS Frequencies 956

APPENDIX G Answers to Odd-Numbered Problems 957

Index 971