数字通信 离散时间方法【2025|PDF|Epub|mobi|kindle电子书版本百度云盘下载】

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Chapter 1 Introduction1

1.1 A Brief History of Communications1

1.2 Basics of Wireless Communications10

1.3 Digital Communications12

1.4 Why Discrete-Time Processing Is So Popular14

1.5 Organization of the Text19

1.6 Notes and References22

Chapter 2 Signals and Systems 1:A Review of the Basics23

2.1 Introduction23

2.2 Signals24

2.2.1 Continuous-Time Signals24

2.2.2 Discrete-Time Signals26

2.3 Systems28

2.3.1 Continuous-Time Systems28

2.3.2 Discrete-Time Systems29

2.4 Frequency Domain Characterizations30

2.4.1 Laplace Transform32

2.4.2 Continuous-Time Fourier Transform37

2.4.3 Z Transform40

2.4.4 Discrete-Time Fourier Transform46

2.5 The Discrete Fourier Transform50

2.6 The Relationship Between Discrete-Time and Continuous-Time Systems55

2.6.1 The Sampling Theorem56

2.6.2 Discrete-Time Processing of Continuous-Time Signals65

2.7 Discrete-Time Processing of Band-Pass Signals67

2.8 Notes and References70

2.9 Exercises71

Chapter 3 Signals and Systems 2:Some Useful Discrete-Time Techniques for Digital Communications114

3.1 Introduction114

3.2 Multirate Signal Processing115

3.2.1 Impulse-Train Sampling115

3.2.2 Downsampling118

3.2.3 Upsampling120

3.2.4 The Noble Identities122

3.2.5 Polyphase Filterbanks122

3.3 Discrete-Time Filter Design Methods127

3.3.1 IIR Filter Designs129

3.3.2 FIR Filter Designs134

3.3.3 Two Important Filters:The Differentiator and the Integrator149

3.4 Notes and References159

3.5 Exercises159

Chapter 4 A Review of Probability Theory178

4.1 Basic Definitions178

4.2 Gaussian Random Variables188

4.2.1 Density and Distribution Functions188

4.2.2 Product Moments192

4.2.3 Functions of Random Variables193

4.3 Multivariate Gaussian Random Variables195

4.3.1 Bivariate Gaussian Distribution196

4.3.2 Linear Operators and Multivariate Gaussian Random Variables197

4.4 Random Sequences198

4.4.1 Power Spectral Density199

4.4.2 Random Sequences and Discrete-Time LTI Systems200

4.5 Additive White Gaussian Noise202

4.5.1 Continuous-Time Random Processes202

4.5.2 The White Gaussian Random Process:A Good Model for Noise？204

4.5.3 White Gaussian Noise in a Sampled Data System206

4.6 Notes and References208

4.7 Exercises208

Chapter 5 Linear Modulation 1:Modulation,Demodulation,and Detection214

5.1 Signal Spaces215

5.1.1 Definitions215

5.1.2 The Synthesis Equation and Linear Modulation222

5.1.3 The Analysis Equation and Detection223

5.1.4 The Matched Filter226

5.2 M-ary Baseband Pulse Amplitude Modulation227

5.2.1 Continuous-Time Realization229

5.2.2 Discrete-Time Realization233

5.3 M-ary Quadrature Amplitude Modulation238

5.3.1 Continuous-Time Realization246

5.3.2 Discrete-Time Realization256

5.4 Offset QPSK260

5.5 Multicarrier Modulation265

5.6 Maximum Likelihood Detection273

5.6.1 Introduction273

5.6.2 Preliminaries274

5.6.3 Maximum Likelihood Decision Rule276

5.7 Notes and References279

5.7.1 Topics Covered279

5.7.2 Topics Not Covered280

5.8 Exercises280

Chapter 6 Linear Modulation 2:Performance305

6.1 Performance of PAM306

6.1.1 Bandwidth306

6.1.2 Probability of Error307

6.2 Performance of QAM313

6.2.1 Bandwidth313

6.2.2 Probability of Error314

6.3 Comparisons325

6.4 Link Budgets331

6.4.1 Received Power and the Friis Equation331

6.4.2 Equivalent Noise Temperature and Noise Figure334

6.4.3 The Link Budget Equation339

6.5 Projecting White Noise onto an Orthonormal Basis Set345

6.6 Notes and References347

6.6.1 Topics Covered347

6.6.2 Topics Not Covered347

6.7 Exercises348

Chapter 7 Carrier Phase Synchronization359

7.1 Basic Problem Formulation360

7.1.1 Approach 1360

7.1.2 Approach 2362

7.2 Carrier Phase Synchronization for QPSK365

7.2.1 A Heuristic Phase Error Detector365

7.2.2 The Maximum Likelihood Phase Error Detector370

7.2.3 Examples374

7.3 Carrier Phase Synchronization for BPSK375

7.4 Carrier Phase Synchronization for MQAM381

7.5 Carrier Phase Synchronization for Offset QPSK382

7.6 Carrier Phase Synchronization for BPSK and QPSK Using Continuous-Time Techniques391

7.7 Phase Ambiguity Resolution394

7.7.1 Unique Word396

7.7.2 Differential Encoding398

7.8 Maximum Likelihood Phase Estimation409

7.8.1 Preliminaries409

7.8.2 Carrier Phase Estimation414

7.9 Notes and References421

7.9.1 Topics Covered421

7.9.2 Topics Not Covered423

7.10 Exercises423

Chapter 8 Symbol Timing Synchronization434

8.1 Basic Problem Formulation436

8.2 Continuous-Time Techniques for M-ary PAM438

8.3 Continuous-Time Techniques for MQAM443

8.4 Discrete-Time Techniques for M-ary PAM445

8.4.1 Timing Error Detectors449

8.4.2 Interpolation462

8.4.3 Interpolation Control475

8.4.4 Examples478

8.5 Discrete-Time Techniques for MQAM494

8.6 Discrete-Time Techniques for Offset QPSK497

8.7 Dealing with Transition Density:A Practical Consideration501

8.8 Maximum Likelihood Estimation503

8.8.1 Preliminaries503

8.8.2 Symbol Timing Estimation510

8.9 Notes and References514

8.9.1 Topics Covered514

8.9.2 Topics Not Covered515

8.10 Exercises515

Chapter 9 System Components519

9.1 The Continuous-Time Discrete-Time Interface519

9.1.1 Analog-to-Digital Converter520

9.1.2 Digital-to-Analog Converter529

9.2 Discrete-Time Oscillators537

9.2.1 Discrete Oscillators Based on LTI Systems538

9.2.2 Direct Digital Synthesizer542

9.3 Resampling Filters555

9.3.1 CIC and Hogenauer Filters557

9.3.2 Half-Band Filters562

9.3.3 Arbitrary Resampling Using Polyphase Filterbanks565

9.4 CoRDiC:Coordinate Rotation Digital Computer578

9.4.1 Rotations:Moving on a Circle578

9.4.2 Moving Along Other Shapes585

9.5 Automatic Gain Control588

9.6 Notes and References593

9.6.1 Topics Covered593

9.6.2 Topics Not Covered597

9.7 Exercises597

Chapter 10 System Design604

10.1 Advanced Discrete-Time Architectures604

10.1.1 Discrete-Time Architectures for QAM Modulators605

10.1.2 Discrete-Time Architectures for QAM Demodulators611

10.1.3 Putting It All Together632

10.2 Channelization637

10.2.1 Continuous-Time Techniques:The Superheterodyne Receiver637

10.2.2 Discrete-Time Techniques Using Multirate Processing650

10.3 Notes and References658

10.3.1 Topics Covered658

10.3.2 Topics Not Covered660

10.4 Exercises662

Appendix A Pulse Shapes673

Appendix B The Complex-Valued Representation for QAM700

Appendix C Phase Locked Loops718

Bibliography751