Modem Theory: An Introduction to Telecommunications

✍ Scribed by Richard E. Blahut

• Publisher: Cambridge University Press
• Year: 2009
• Tongue: English
• Leaves: 515
• Edition: 1
• Category: Library

✦ Synopsis

At the heart of any modern communication system is the modem, connecting the data source to the communication channel. This first course in the mathematical theory of modem design introduces the theory of digital modulation and coding that underpins the design of digital telecommunications systems. A detailed treatment of core subjects is provided, including baseband and passband modulation and demodulation, equalization, and sequence estimation. The modulation waveforms for communication channels and digital recording channels are treated in a common setting and with unified terminology. A variety of more advanced topics is also covered, such as trellis codes, turbo codes, the Viterbi algorithm, block codes, maximum likelihood and maximum posterior probability, iterative demodulation, and jamming. Numerous end-of-chapter exercises are also included to test the reader's understanding throughout. This insightful book is ideal for senior undergraduate students studying digital communications and is also a useful reference for practicing engineers.

✦ Table of Contents

Half-title......Page 3
Title......Page 5
Copyright......Page 6
Dedication......Page 7
Contents......Page 9
Preface......Page 14
1.1 Transmission of information......Page 19
1.2 A brief historical survey......Page 22
1.3 Point-to-point digital communication......Page 25
1.4 Networks for digital communication......Page 28
1.5 The Fourier transform......Page 30
1.6 Transforms of some useful functions......Page 36
1.7 Gaussian random variables......Page 42
1.8 Circular random processes......Page 44
Problems for Chapter 1......Page 45
2.1 Baseband and passband channels......Page 49
2.2 Baseband waveforms for binary signaling......Page 50
2.3 Baseband waveforms for multilevel signaling......Page 53
2.4 Nyquist pulses......Page 56
2.5 Eye diagrams......Page 61
2.6 Differential modulation......Page 63
2.7 Binary orthogonal signaling at baseband......Page 65
2.8 M-ary orthogonal signaling at baseband......Page 67
2.9 Power density spectrum of baseband waveforms......Page 70
Problems for Chapter 2......Page 72
Notes for Chapter 2......Page 75
3.1 The matched filter......Page 76
3.2 Demodulation of binary baseband waveforms......Page 86
3.3 Error rates for binary signaling......Page 90
3.4 Demodulators for multilevel signaling......Page 95
3.5 Error rates for multilevel signaling......Page 97
3.6 Demodulators for M-ary orthogonal signaling......Page 98
3.7 Error rates for M-ary orthogonal signaling......Page 99
Problems for Chapter 3......Page 107
Notes for Chapter 3......Page 111
4.1 Intersymbol interference......Page 112
4.2 Decision-feedback demodulation......Page 115
4.3 Searching a trellis......Page 118
4.4 Error bounds for sequence demodulation......Page 125
4.5 Dominant error patterns......Page 130
4.6 Linear equalization......Page 136
4.7 Adaptive equalization......Page 138
4.8 Least-mean-square equalization......Page 140
Problems for Chapter 4......Page 144
Notes for Chapter 4......Page 148
5.1 Passband waveforms......Page 149
5.2 Complex baseband waveforms......Page 157
5.3 Passband filtering......Page 160
5.4 Passband waveforms for binary signaling......Page 162
5.5 Multilevel signaling at passband......Page 165
5.6 Power density spectra of passband waveforms......Page 169
5.7 Minimum-shift keying......Page 171
5.8 M-ary orthogonal signaling at passband......Page 177
5.9 Signal space......Page 182
Problems for Chapter 5......Page 186
Notes for Chapter 5......Page 193
6.1 The matched filter at passband......Page 194
6.2 Coherent demodulation of binary waveforms......Page 196
6.3 Noncoherent demodulation of binary waveforms......Page 201
6.4 Rayleigh and ricean probability distributions......Page 205
6.5 Error rates for noncoherent signaling......Page 210
6.6 Differential phase-shift keying......Page 214
6.7 Demodulators for M-ary orthogonal signaling......Page 218
6.8 Error rates for M-ary orthogonal signaling......Page 220
6.9 Demodulators for M-ary signal constellations......Page 223
6.10 Error rates for M-ary signal constellations......Page 224
Problems for Chapter 6......Page 229
Notes for Chapter 6......Page 234
7.1 The likelihood function......Page 236
7.2 The maximum-likelihood principle......Page 238
7.3 Maximum-likelihood demodulation......Page 241
7.4 Maximum-likelihood sequence demodulation......Page 246
7.5 Noncoherent combining of diversity signals......Page 252
7.6 The maximum-posterior principle......Page 258
7.7 Maximum-posterior sequence demodulation......Page 260
Problems for Chapter 7......Page 266
Notes for Chapter 7......Page 267
8.1 Estimation of waveform parameters......Page 269
8.2 Estimation of phase......Page 272
8.3 Recursive phase estimation......Page 275
8.4 Estimation of delay......Page 280
8.5 Carrier synchronization......Page 283
8.6 Recursive carrier synchronization......Page 288
8.7 Symbol synchronization......Page 294
8.8 Block synchronization......Page 302
8.9 Synchronization sequences......Page 309
Problems for Chapter 8......Page 312
Notes for Chapter 8......Page 315
9.1 Partial-response signaling......Page 317
9.2 Continuous-phase modulation......Page 326
9.3 Trellis codes for digital modulation......Page 335
9.4 Lattices and lattice cosets......Page 348
9.5 Trellis codes on lattice cosets......Page 350
9.6 Differential trellis codes......Page 355
9.7 Four-dimensional trellis codes......Page 359
Problems for Chapter 9......Page 361
Notes for Chapter 9......Page 365
10.1 Block codes for data transmission......Page 367
10.2 Codes constructed in a finite field......Page 375
10.3 Decoding of block codes......Page 383
10.4 Performance of block codes......Page 386
10.5 Convolutional codes for data transmission......Page 392
10.6 Decoding of convolutional codes......Page 402
10.7 Performance of convolutional codes......Page 405
10.8 Turbo codes......Page 409
10.9 Turbo decoding......Page 411
Problems for Chapter 10......Page 412
Notes for Chapter 10......Page 415
11.1 Energy budgets......Page 417
11.2 Channel capacity......Page 421
11.3 Capacity of gaussian channels......Page 426
11.4 Signal impairments and noise......Page 435
11.5 Amplitude uncertainty......Page 436
11.6 Phase uncertainty......Page 440
11.7 Multipath channels and fading......Page 442
11.8 The hardlimiter at baseband and passband......Page 450
11.9 Smooth nonlinearities......Page 462
Problems for Chapter 11......Page 464
Notes for Chapter 11......Page 469
12.1 The jammer channel......Page 471
12.2 Partial-message jamming......Page 473
12.3 Bandwidth expansion......Page 479
12.4 Direct-sequence spread spectrum......Page 485
12.5 Frequency-hopping spread spectrum......Page 487
Problems for Chapter 12......Page 491
Notes for Chapter 12......Page 496
Bibliography......Page 497
Index......Page 506