Introduction to Communication Systems

Madhow, U.Introduction to communication systems(CUP,2014)(ISBN 9781107022775)(600dpi)(544p) 4......Page 4
Copyright 5......Page 5
Contents vii 7......Page 7
Preface page xiii 12......Page 12
Acknowledgements xviii 17......Page 17
Chapter plan 1 ......Page 19
1.1.1 Analog communication 2 ......Page 20
1.1.2 Digital communication 3 ......Page 21
1.1.3 Why digital? 7 ......Page 25
1.1.4 Why analog design remains important 8 ......Page 26
1.2 A technology perspective 9 ......Page 27
1.3 The scope of this textbook 12 ......Page 30
1.5 Concept summary 13 ......Page 31
1.6 Notes 14 ......Page 32
Chapter plan 16 ......Page 34
2.1 Complex numbers 17 ......Page 35
2.2 Signals 20 ......Page 38
2.3 Linear time-invariant systems 26 ......Page 44
2.3.1 Discrete-time convolution 33 ......Page 51
2.3.2 Multi-rate systems 35 ......Page 53
2.4 Fourier series 37 ......Page 55
2.4.1 Fourier-series properties and applications 40 ......Page 58
2.5 The Fourier transform 42 ......Page 60
2.5.1 Fourier-transform properties 45 ......Page 63
2.5.2 Numerical computation using DFT 50 ......Page 68
2.6 Energy spectral density and bandwidth 53 ......Page 71
2.7 Baseband and passband signals 55 ......Page 73
2.8.1 Time-domain relationships 57 ......Page 75
2.8.2 Frequency-domain relationships 63 ......Page 81
2.8.3 The complex-baseband equivalent of passband filtering 67 ......Page 85
2.8.4 General comments on complex baseband 69 ......Page 87
2.9 Wireless-channel modeling in complex baseband 71 ......Page 89
2.10 Concept summary 74 ......Page 92
2.12 Problems 75 ......Page 93
Software Lab 2.1: signals and systems computations using Matlab 80 ......Page 98
Software Lab 2.2: modeling carrier-phase uncertainty 83 ......Page 101
Software Lab 2.3: modeling a lamppost-based broadband network 84 ......Page 102
3 Analog communication techniques 87 ......Page 105
3.1 Terminology and notation 88 ......Page 106
3.2.1 Double-sideband (DSB) suppressed carrier (SC) 90 ......Page 108
3.2.2 Conventional AM 93 ......Page 111
3.2.3 Single-sideband modulation (SSB) 99 ......Page 117
3.2.4 Vestigial-sideband (VSB) modulation 104 ......Page 122
3.2.6 Concept synthesis for AM 106 ......Page 124
3.3 Angle modulation 108 ......Page 126
3.3.1 Limiter-discriminator demodulation 111 ......Page 129
3.3.2 FM spectrum 113 ......Page 131
3.3.3 Concept synthesis for FM 116 ......Page 134
3.4 The superheterodyne receiver 117 ......Page 135
3.5 The phase-locked loop 121 ......Page 139
3.5.1 PLL applications 124 ......Page 142
3.5.2 A mathematical model for the PLL 125 ......Page 143
3.5.3 PLL analysis 126 ......Page 144
3.6 Some analog communication systems 131 ......Page 149
3.6.1 FM radio 132 ......Page 150
3.6.2 Analog broadcast TV 133 ......Page 151
3.7 Concept summary 135 ......Page 153
3.9 Problems 138 ......Page 156
Software Lab 3.1: amplitude modulation and envelope detection 149 ......Page 167
Software Lab 3.2: frequency-modulation basics 151 ......Page 169
Chapter plan 155 ......Page 173
4.1 Signal constellations 156 ......Page 174
4.2.1 Power spectral density 160 ......Page 178
4.2.2 The PSD of a linearly modulated signal 162 ......Page 180
4.3.1 Nyquist’s sampling theorem and the sine pulse 166 ......Page 184
4.3.2 The Nyquist criterion for ISI avoidance 169 ......Page 187
4.3.4 Power-bandwidth tradeoffs: a sneak preview 175 ......Page 193
4.3.5 The Nyquist criterion at the link level 178 ......Page 196
4.4 Orthogonal and biorthogonal modulation 179 ......Page 197
4.5 Proofs of the Nyquist theorems 184 ......Page 202
4.6 Concept summary 186 ......Page 204
4.7 Notes 188 ......Page 206
4.8 Problems 189 ......Page 207
Software Lab 4.1: linear modulation over a noiseless ideal channel 196 ......Page 214
Appendix 4. A Power spectral density of a linearly modulated signal 200 ......Page 218
Appendix 4.B Simulation resource: bandlimited pulses and upsampling 202 ......Page 220
Chapter plan 207 ......Page 225
5.1 Probability basics 208 ......Page 226
5.2 Random variables 214 ......Page 232
5.3 Multiple random variables, or random vectors 220 ......Page 238
5.4 Functions of random variables 228 ......Page 246
5.5 Expectation 233 ......Page 251
5.5.1 Expectation for random vectors 237 ......Page 255
5.6 Gaussian random variables 238 ......Page 256
5.6.1 Joint Gaussianity 245 ......Page 263
5.7 Random processes 254 ......Page 272
5.7.1 Running example: a sinusoid with random amplitude and phase 255 ......Page 273
5.7.2 Basic definitions 256 ......Page 274
5.7.3 Second-order statistics 258 ......Page 276
5.7.4 Wide-sense stationarity and stationarity 259 ......Page 277
5.7.5 Power spectral density 260 ......Page 278
5.7.6 Gaussian random processes 266 ......Page 284
5.8 Noise modeling 268 ......Page 286
5.9 Linear operations on random processes 273 ......Page 291
5.9.1 Filtering 274 ......Page 292
5.9.2 Correlation 277 ......Page 295
5.10 Concept summary 280 ......Page 298
5.11 Notes 281 ......Page 299
5.12 Problems 282 ......Page 300
Appendix 5.A Q function bounds and asymptotics 297 ......Page 315
Appendix 5.B Approximations using limit theorems 298 ......Page 316
Appendix 5.C Noise mechanisms 299 ......Page 317
Appendix 5.D The structure of passband random processes 302 ......Page 320
Appendix 5.D.1 Baseband representation of passband white noise 303 ......Page 321
Appendix 5.E.1 Noise model and SNR benchmark 304 ......Page 322
Appendix 5.E.2 SNR for amplitude modulation 305 ......Page 323
Software Lab 8.3: MIMO signal processing 508 ......Page 326
6 Optimal demodulation 315 ......Page 333
Chapter plan 316 ......Page 334
6.1 Hypothesis testing 317 ......Page 335
6.1.1 Error probabilities 318 ......Page 336
6.1.2 ML and MAP decision rules 319 ......Page 337
6.1.3 Soft decisions 326 ......Page 344
6.2 Signal-space concepts 328 ......Page 346
6.2.1 Representing signals as vectors 329 ......Page 347
6.2.2 Modeling WGN in signal space 334 ......Page 352
6.2.3 Hypothesis testing in signal space 335 ......Page 353
6.2.4 Optimal reception in AWGN 337 ......Page 355
6.2.5 Geometry of the ML decision rule 342 ......Page 360
6.3 Performance analysis of ML reception 343 ......Page 361
6.3.1 The geometry of errors 344 ......Page 362
6.3.2 Performance with binary signaling 345 ......Page 363
6.3.3 M-ary signaling: scale-invariance and SNR 348 ......Page 366
6.3.4 Performance analysis for M-ary signaling 353 ......Page 371
6.3.5 Performance analysis for M-ary orthogonal modulation 362 ......Page 380
6.4 Bit error probability 366 ......Page 384
6.5 Link-budget analysis 368 ......Page 386
6.6 Concept summary 374 ......Page 392
6.7 Notes 377 ......Page 395
6.8 Problems 378 ......Page 396
Software Lab 6.1: linear modulation with two-dimensional constellations 393 ......Page 411
Software Lab 6.2: modeling and performance evaluation on a wireless fading channel 396 ......Page 414
Appendix 6. A The irrelevance of the component orthogonal to the signal space 399 ......Page 417
7 Channel coding 401 ......Page 419
7.1 Motivation 402 ......Page 420
7.2 Model for channel coding 405 ......Page 423
7.3 Shannon’s promise 407 ......Page 425
7.3.1 Design implications of Shannon limits 414 ......Page 432
7.4 Introducing linear codes 415 ......Page 433
7.5 Soft decisions and belief propagation 427 ......Page 445
7.6 Concept summary 431 ......Page 449
7.7 Notes 433 ......Page 451
7.8 Problems 434 ......Page 452
Software Lab 7.1: belief propagation 441 ......Page 459
8 Dispersive channels and MIMO 446 ......Page 464
Chapter plan 447 ......Page 465
8.1 The single-carrier system model 448 ......Page 466
8.1.1 The signal model 449 ......Page 467
8.1.2 The noise model and SNR 452 ......Page 470
8.2 Linear equalization 453 ......Page 471
8.2.1 Adaptive MMSE equalization 454 ......Page 472
8.2.2 Geometric interpretation and analytical computations 459 ......Page 477
8.3 Orthogonal frequency-division multiplexing 467 ......Page 485
8.3.1 DSP-centric implementation 469 ......Page 487
8.4.1 The linear array 474 ......Page 492
8.4.2 Beamsteering 477 ......Page 495
8.4.3 Rich scattering and MIMO-OFDM 480 ......Page 498
8.4.4 Diversity 483 ......Page 501
8.4.5 Spatial multiplexing 487 ......Page 505
8.5 Concept summary 491 ......Page 509
8.6 Notes 493 ......Page 511
8.7 Problems 494 ......Page 512
Software Lab 8.1: introduction to equalization in single-carrier systems 502 ......Page 520
Software Lab 8.2: simplified simulation model for an OFDM link 505 ......Page 523
Epilogue 512 ......Page 530
References 519 ......Page 537
Index 522 ......Page 540
cover......Page 1