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Chapter 1 Introduction1

1.1 Basic concepts and models of communication system2

1.1.1 Communication system model2

1.1.2 Analog communication model2

1.1.3 Digital communication model3

1.2 The classification of communication systems4

1.2.1 Modulation mode4

1.2.2 Division of frequency band5

1.3 Information and its measurement6

1.4 The main performance index of communication systems7

Summary and discussion8

Homework9

Vocabulary9

Chapter 2 Random processes11

2.1 Basic concepts of random processes（Definition of random processes）12

2.1.1 Definition12

2.1.2 Numerical characteristics of a random process13

2.2 Stationary Random Process14

2.2.1 Definition14

2.2.2 Ergodicity15

2.2.3 Autocorrelation function of stationary random processes17

2.2.4 Power Spectral Density17

2.3 Gaussian process19

2.4 Transmission of a random process through a Linear Time-Invariant （LTI）filter21

2.5 Narrowband random process23

2.6 Sine wave plus narrowband Gaussian noise26

2.7 Gaussian white noise and band pass white noise27

Summary and discussion29

Homework30

Vocabulary31

Chapter 3 Channel32

3.1 The classification of channels33

3.1.1 Wireless channels33

3.1.2 Wire channel34

3.2 Channel models35

3.2.1 Modulation channel model（调制解调模型）35

3.2.2 Coding channel model（编码信道模型）36

3.3 Influence of the channel characteristics on transmission （for modulation model）37

3.3.1 Influence of constant parameter channel on signal transmission37

3.3.2 Influence of random parameter channel of signal transmission37

3.4 Channel capacity （continuous channel）40

Summary and discussion41

Homework42

Vocabulary and terminologies42

Chapter 4 Continuous-wave modulation （Analog modulation system）43

4.1 Introduction43

4.2 Linear modulation44

4.2.1 AM45

4.2.2 Double-Sideband Modulation46

4.2.3 Single-Sideband Modulation47

4.2.4 Vestigial Sideband Modulation49

4.3 Anti-noise performance of linear demodulation51

4.3.1 Noise in linear receiver using coherent detection52

4.3.2 Noise in AM receivers using envelope detection54

Homework （part 1）57

4.4 Angle modulation （Non-linear modulation process）58

4.4.1 Basic definitions58

4.4.2 NBFM（窄带调频）60

4.4.3 Wide-band frequency modulation （WBFM）61

4.4.4 Generating an FM signal62

4.4.5 Demodulation of FM signals63

4.4.6 Noise in FM receivers64

4.5 Frequency-division multiplexing（频分复用）66

Summary and discussion67

Homework （part 2）68

Terminologies68

Chapter 5 Pulse modulation69

5.1 Sampling process70

5.2 Analog pulse modulation（模拟脉冲调制）72

5.3 Quantization process（量化过程）of sampled signal74

5.3.1 Uniform quantization（均匀量化）75

5.3.2 Nonuniform quantization76

5.4 PCM （Pulse code modulation，脉冲编码调制）78

5.4.1 The principle of PCM78

5.4.2 Noise in PCM system79

5.4.3 Delta modulation（增量调制）80

5.4.4 DPCM （Differential pulse code modulation，差分脉冲调制）82

5.5 TDM（Time-Division Multiplexing，时分复用）82

Summary and discussion84

Homework84

Terminologies85

Chapter 6 Baseband pulse transmission86

6.1 Waveform and frequency characteristics of baseband digital signal87

6.1.1 Waveform of baseband digital signal87

6.1.2 Symbol code types of baseband digital signals for transmission88

6.1.3 Frequency characteristic89

6.2 Matched filter91

6.3 Error rate due to noise93

6.3.1 Binary polar baseband system93

6.3.2 The unipolar baseband system94

6.4 Intersymbol Interference95

6.4.1 Nyquist’s criterionⅠ96

6.4.2 Nyquist’s criterionⅡ98

6.5 Eye pattern100

Summary and discussion101

Homework101

Terminologies102

Chapter 7 Passband data transmission （Digital passband transmission）103

7.1 The basic principle of three digital passband modulation104

7.1.1 ASK104

7.1.2 FSK106

7.1.3 PSK（Absolute phase shift keying）108

7.1.4 DPSK （Differential PSK）110

7.2 Anti-noise performance of digital passband modulation system111

7.2.1 Bit error rate of ASK111

7.2.2 Bit error rate of 2FSK112

7.2.3 Bit error rate of PSK114

7.2.4 Performance comparison of digital keying transmission system115

7.3 Hybrid amplitude/phase modulation schemes116

7.4 OFDM system117

Summary and discussion118

Homework119

Terminologies120

Chapter 8 Further reading：new technologies in communication systems121

8.1 Compressive sensing （CS）121

8.1.1 Introduction121

8.1.2 The mathematics theory122

8.1.3 Application124

8.2 Ultra wideband （UWB） system126

8.2.1 The definition of UWB126

8.2.2 Comparison with other wireless communications127

8.2.3 Feature of UWB127

8.2.4 Impulse modulation signal in UWB signal128

8.2.5 The application of UWB129

8.3 MIMO technology130

8.3.1 The model of MIMO131

8.3.2 Applications132

References of Chapter 8135

附录A MATLAB仿真实验136

Experiment 1 Continuous-wave modulation （Corresponding to Chapter 4）136

Experiment 2 Pulse modulation （Corresponding to Chapter 5）148

Experiment 3 Digital passband transmission （Corresponding to Chapter 7）160

附录B 实验箱实验181

实验一 各种模拟信号源实验181

实验二 脉冲编码调制PCM185

实验三 AMI/HDB 3 编码和译码过程实验192

实验四 FSK调制解调实验197

实验五 通信系统综合实验202

附录C 误差函数表207

参考文献210