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Probability, Random Variables, and Random Processes: Theory and Signal Processing Applications
ISBN-13: 9780470242094 / Angielski / Twarda / 2012 / 794 str.
Probability, Random Variables, and Random Processes: Theory and Signal Processing Applications
ISBN-13: 9780470242094 / Angielski / Twarda / 2012 / 794 str.
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Probability, Random Variables, and Random Processes is a comprehensive textbook on probability theory for engineers that provides a more rigorous mathematical framework than is usually encountered in undergraduate courses. It is intended for first-year graduate students who have some familiarity with probability and random variables, though not necessarily of random processes and systems that operate on random signals. It is also appropriate for advanced undergraduate students who have a strong mathematical background. The book has the following features:
- Several appendices include related material on integration, important inequalities and identities, frequency-domain transforms, and linear algebra. These topics have been included so that the book is relatively self-contained. One appendix contains an extensive summary of 33 random variables and their properties such as moments, characteristic functions, and entropy.
- Unlike most books on probability, numerous figures have been included to clarify and expand upon important points. Over 600 illustrations and MATLAB plots have been designed to reinforce the material and illustrate the various characterizations and properties of random quantities.
- Sufficient statistics are covered in detail, as is their connection to parameter estimation techniques. These include classical Bayesian estimation and several optimality criteria: mean-square error, mean-absolute error, maximum likelihood, method of moments, and least squares.
- The last four chapters provide an introduction to several topics usually studied in subsequent engineering courses: communication systems and information theory; optimal filtering (Wiener and Kalman); adaptive filtering (FIR and IIR); and antenna beamforming, channel equalization, and direction finding. This material is available electronically at the companion website.
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PREFACE xxi
NOTATION xxv
1 Overview and Background 1
1.1 Introduction 1
1.1.1 Signals, Signal Processing, and Communications 3
1.1.2 Probability, Random Variables, and Random Vectors 9
1.1.3 Random Sequences and Random Processes 11
1.1.4 Delta Functions 16
1.2 Deterministic Signals and Systems 19
1.2.1 Continuous Time 20
1.2.2 Discrete Time 25
1.2.3 Discrete–Time Filters 29
1.2.4 State–Space Realizations 32
1.3 Statistical Signal Processing with MATLAB® 35
1.3.1 Random Number Generation 35
1.3.2 Filtering 38
Problems 39
Further Reading 45
PART I Probability, Random Variables, and Expectation
2 Probability Theory 49
2.1 Introduction 49
2.2 Sets and Sample Spaces 50
2.3 Set Operations 54
2.4 Events and Fields 58
2.5 Summary of a Random Experiment 64
2.6 Measure Theory 64
2.7 Axioms of Probability 68
2.8 Basic Probability Results 69
2.9 Conditional Probability 71
2.10 Independence 73
2.11 Bayes Formula 74
2.12 Total Probability 76
2.13 Discrete Sample Spaces 79
2.14 Continuous Sample Spaces 83
2.15 Nonmeasurable Subsets of R 84
Problems 87
Further Reading 90
3 Random Variables 91
3.1 Introduction 91
3.2 Functions and Mappings 91
3.3 Distribution Function 96
3.4 Probability Mass Function 101
3.5 Probability Density Function 103
3.6 Mixed Distributions 104
3.7 Parametric Models for Random Variables 107
3.8 Continuous Random Variables 109
3.8.1 Gaussian Random Variable (Normal) 110
3.8.2 Log–Normal Random Variable 113
3.8.3 Inverse Gaussian Random Variable (Wald) 114
3.8.4 Exponential Random Variable (One–Sided) 116
3.8.5 Laplace Random Variable (Double–Sided Exponential) 119
3.8.6 Cauchy Random Variable 122
3.8.7 Continuous Uniform Random Variable 124
3.8.8 Triangular Random Variable 125
3.8.9 Rayleigh Random Variable 127
3.8.10 Rice Random Variable 129
3.8.11 Gamma Random Variable (Erlang for r N) 131
3.8.12 Beta Random Variable (Arcsine for = = 1/2, Power Function for = 1) 133
3.8.13 Pareto Random Variable 136
3.8.14 Weibull Random Variable 137
3.8.15 Logistic Random Variable (Sigmoid for { = 0, = 1}) 139
3.8.16 Chi Random Variable (Maxwell Boltzmann, Half–Normal) 141
3.8.17 Chi–Square Random Variable 144
3.8.18 F–Distribution 147
3.8.19 Student s t Distribution 149
3.8.20 Extreme Value Distribution (Type I: Gumbel) 150
3.9 Discrete Random Variables 151
3.9.1 Bernoulli Random Variable 152
3.9.2 Binomial Random Variable 154
3.9.3 Geometric Random Variable (with Support Z+ or N) 157
3.9.4 Negative Binomial Random Variable (Pascal) 160
3.9.5 Poisson Random Variable 162
3.9.6 Hypergeometric Random Variable 165
3.9.7 Discrete Uniform Random Variable 167
3.9.8 Logarithmic Random Variable (Log–Series) 168
3.9.9 Zeta Random Variable (Zipf) 170
Problems 173
Further Reading 176
4 Multiple Random Variables 177
4.1 Introduction 177
4.2 Random Variable Approximations 177
4.2.1 Binomial Approximation of Hypergeometric 177
4.2.2 Poisson Approximation of Binomial 179
4.2.3 Gaussian Approximations 181
4.2.4 Gaussian Approximation of Binomial 181
4.2.5 Gaussian Approximation of Poisson 181
4.2.6 Gaussian Approximation of Hypergeometric 183
4.3 Joint and Marginal Distributions 183
4.4 Independent Random Variables 186
4.5 Conditional Distribution 187
4.6 Random Vectors 190
4.6.1 Bivariate Uniform Distribution 193
4.6.2 Multivariate Gaussian Distribution 193
4.6.3 Multivariate Student s t Distribution 196
4.6.4 Multinomial Distribution 197
4.6.5 Multivariate Hypergeometric Distribution 198
4.6.6 Bivariate Exponential Distributions 200
4.7 Generating Dependent Random Variables 201
4.8 Random Variable Transformations 205
4.8.1 Transformations of Discrete Random Variables 205
4.8.2 Transformations of Continuous Random Variables 207
4.9 Important Functions of Two Random Variables 218
4.9.1 Sum: Z = X + Y 218
4.9.2 Difference: Z = X Y 220
4.9.3 Product: Z = XY 221
4.9.4 Quotient (Ratio): Z = X/Y 224
4.10 Transformations of Random Variable Families 226
4.10.1 Gaussian Transformations 226
4.10.2 Exponential Transformations 227
4.10.3 Chi–Square Transformations 228
4.11 Transformations of Random Vectors 229
4.12 Sample Mean ¯X and Sample Variance S2 232
4.13 Minimum, Maximum, and Order Statistics 234
4.14 Mixtures 238
Problems 240
Further Reading 243
5 Expectation and Moments 244
5.1 Introduction 244
5.2 Expectation and Integration 244
5.3 Indicator Random Variable 245
5.4 Simple Random Variable 246
5.5 Expectation for Discrete Sample Spaces 247
5.6 Expectation for Continuous Sample Spaces 250
5.7 Summary of Expectation 253
5.8 Functional View of the Mean 254
5.9 Properties of Expectation 255
5.10 Expectation of a Function 259
5.11 Characteristic Function 260
5.12 Conditional Expectation 265
5.13 Properties of Conditional Expectation 267
5.14 Location Parameters: Mean, Median, and Mode 276
5.15 Variance, Covariance, and Correlation 280
5.16 Functional View of the Variance 283
5.17 Expectation and the Indicator Function 284
5.18 Correlation Coefficients 285
5.19 Orthogonality 291
5.20 Correlation and Covariance Matrices 294
5.21 Higher Order Moments and Cumulants 296
5.22 Functional View of Skewness 302
5.23 Functional View of Kurtosis 303
5.24 Generating Functions 304
5.25 Fourth–Order Gaussian Moment 309
5.26 Expectations of Nonlinear Transformations 310
Problems 313
Further Reading 316
PART II Random Processes, Systems, and Parameter Estimation
6 Random Processes 319
6.1 Introduction 319
6.2 Characterizations of a Random Process 319
6.3 Consistency and Extension 324
6.4 Types of Random Processes 325
6.5 Stationarity 326
6.6 Independent and Identically Distributed 329
6.7 Independent Increments 331
6.8 Martingales 333
6.9 Markov Sequence 338
6.10 Markov Process 350
6.11 Random Sequences 352
6.11.1 Bernoulli Sequence 352
6.11.2 Bernoulli Scheme 352
6.11.3 Independent Sequences 353
6.11.4 Bernoulli Random Walk 354
6.11.5 Binomial Counting Sequence 356
6.12 Random Processes 359
6.12.1 Poisson Counting Process 359
6.12.2 Random Telegraph Signal 365
6.12.3 Wiener Process 368
6.12.4 Gaussian Process 371
6.12.5 Pulse Amplitude Modulation 372
6.12.6 Random Sine Signals 373
Problems 375
Further Reading 379
7 Stochastic Convergence, Calculus, and Decompositions 380
7.1 Introduction 380
7.2 Stochastic Convergence 380
7.3 Laws of Large Numbers 388
7.4 Central Limit Theorem 390
7.5 Stochastic Continuity 394
7.6 Derivatives and Integrals 404
7.7 Differential Equations 414
7.8 Difference Equations 422
7.9 Innovations and Mean–Square Predictability 423
7.10 Doob Meyer Decomposition 428
7.11 Karhunen Lo`eve Expansion 433
Problems 441
Further Reading 444
8 Systems, Noise, and Spectrum Estimation 445
8.1 Introduction 445
8.2 Correlation Revisited 445
8.3 Ergodicity 448
8.4 Eigenfunctions of RXX( ) 456
8.5 Power Spectral Density 457
8.6 Power Spectral Distribution 463
8.7 Cross–Power Spectral Density 465
8.8 Systems with Random Inputs 468
8.8.1 Nonlinear Systems 469
8.8.2 Linear Systems 471
8.9 Passband Signals 476
8.10 White Noise 479
8.11 Bandwidth 484
8.12 Spectrum Estimation 487
8.12.1 Periodogram 487
8.12.2 Smoothed Periodogram 493
8.12.3 Modified Periodogram 497
8.13 Parametric Models 500
8.13.1 Autoregressive Model 500
8.13.2 Moving–Average Model 505
8.13.3 Autoregressive Moving–Average Model 509
8.14 System Identification 513
Problems 515
Further Reading 518
9 Sufficient Statistics and Parameter Estimation 519
9.1 Introduction 519
9.2 Statistics 519
9.3 Sufficient Statistics 520
9.4 Minimal Sufficient Statistic 525
9.5 Exponential Families 528
9.6 Location–Scale Families 533
9.7 Complete Statistic 536
9.8 Rao Blackwell Theorem 538
9.9 Lehmann Scheff´e Theorem 540
9.10 Bayes Estimation 542
9.11 Mean–Square–Error Estimation 545
9.12 Mean–Absolute–Error Estimation 552
9.13 Orthogonality Condition 553
9.14 Properties of Estimators 555
9.14.1 Unbiased 555
9.14.2 Consistent 557
9.14.3 Efficient 559
9.15 Maximum A Posteriori Estimation 561
9.16 Maximum Likelihood Estimation 567
9.17 Likelihood Ratio Test 569
9.18 Expectation Maximization Algorithm 570
9.19 Method of Moments 576
9.20 Least–Squares Estimation 577
9.21 Properties of LS Estimators 582
9.21.1 Minimum WLS 582
9.21.2 Uniqueness 582
9.21.3 Orthogonality 582
9.21.4 Unbiased 584
9.21.5 Covariance Matrix 584
9.21.6 Efficient: Achieves CRLB 585
9.21.7 BLU Estimator 585
9.22 Best Linear Unbiased Estimation 586
9.23 Properties of BLU Estimators 590
Problems 592
Further Reading 595
A Note on Part III of the Book 595
APPENDICES
Introduction to Appendices 597
A Summaries of Univariate Parametric Distributions 599
A.1 Notation 599
A.2 Further Reading 600
A.3 Continuous Random Variables 601
A.3.1 Beta (Arcsine for = = 1/2, Power Function for = 1) 601
A.3.2 Cauchy 602
A.3.3 Chi 603
A.3.4 Chi–Square 604
A.3.5 Exponential (Shifted by c) 605
A.3.6 Extreme Value (Type I: Gumbel) 606
A.3.7 F–Distribution 607
A.3.8 Gamma (Erlang for r N with (r ) = (r 1)!) 608
A.3.9 Gaussian (Normal) 609
A.3.10 Half–Normal (Folded Normal) 610
A.3.11 Inverse Gaussian (Wald) 611
A.3.12 Laplace (Double–Sided Exponential) 612
A.3.13 Logistic (Sigmoid for { = 0, = 1}) 613
A.3.14 Log–Normal 614
A.3.15 Maxwell Boltzmann 615
A.3.16 Pareto 616
A.3.17 Rayleigh 617
A.3.18 Rice 618
A.3.19 Student s t Distribution 619
A.3.20 Triangular 620
A.3.21 Uniform (Continuous) 621
A.3.22 Weibull 622
A.4 Discrete Random Variables 623
A.4.1 Bernoulli (with Support {0, 1}) 623
A.4.2 Bernoulli (Symmetric with Support { 1, 1}) 624
A.4.3 Binomial 625
A.4.4 Geometric (with Support Z+) 626
A.4.5 Geometric (Shifted with Support N) 627
A.4.6 Hypergeometric 628
A.4.7 Logarithmic (Log–Series) 629
A.4.8 Negative Binomial (Pascal) 630
A.4.9 Poisson 631
A.4.10 Uniform (Discrete) 632
A.4.11 Zeta (Zipf) 633
B Functions and Properties 634
B.1 Continuity and Bounded Variation 634
B.2 Supremum and Infimum 640
B.3 Order Notation 640
B.4 Floor and Ceiling Functions 641
B.5 Convex and Concave Functions 641
B.6 Even and Odd Functions 641
B.7 Signum Function 643
B.8 Dirac Delta Function 644
B.9 Kronecker Delta Function 645
B.10 Unit–Step Functions 646
B.11 Rectangle Functions 647
B.12 Triangle and Ramp Functions 647
B.13 Indicator Functions 648
B.14 Sinc Function 649
B.15 Logarithm Functions 650
B.16 Gamma Functions 651
B.17 Beta Functions 653
B.18 Bessel Functions 655
B.19 Q–Function and Error Functions 655
B.20 Marcum Q–Function 659
B.21 Zeta Function 659
B.22 Rising and Falling Factorials 660
B.23 Laguerre Polynomials 661
B.24 Hypergeometric Functions 662
B.25 Bernoulli Numbers 663
B.26 Harmonic Numbers 663
B.27 Euler Mascheroni Constant 664
B.28 Dirichlet Function 664
Further Reading 664
C Frequency–Domain Transforms and Properties 665
C.1 Laplace Transform 665
C.2 Continuous–Time Fourier Transform 669
C.3 z–Transform 670
C.4 Discrete–Time Fourier Transform 676
Further Reading 677
D Integration and Integrals 678
D.1 Review of Riemann Integral 678
D.2 Riemann Stieltjes Integral 681
D.3 Lebesgue Integral 684
D.4 Pdf Integrals 688
D.5 Indefinite and Definite Integrals 690
D.6 Integral Formulas 692
D.7 Double Integrals of Special Functions 692
Further Reading 696
E Identities and Infinite Series 697
E.1 Zero and Infinity 697
E.2 Minimum and Maximum 697
E.3 Trigonometric Identities 698
E.4 Stirling s Formula 698
E.5 Taylor Series 699
E.6 Series Expansions and Closed–Form Sums 699
E.7 Vandermonde s Identity 702
E.8 Pmf Sums and Functional Forms 703
E.9 Completing the Square 704
E.10 Summation by Parts 705
Further Reading 706
F Inequalities and Bounds for Expectations 707
F.1 Cauchy Schwarz and H¨older Inequalities 707
F.2 Triangle and Minkowski Inequalities 708
F.3 Bienaym´e, Chebyshev, and Markov Inequalities 709
F.4 Chernoff s Inequality 711
F.5 Jensen s Inequality 713
F.6 Cram´er Rao Inequality 714
Further Reading 718
G Matrix and Vector Properties 719
G.1 Basic Properties 719
G.2 Four Fundamental Subspaces 721
G.3 Eigendecomposition 722
G.4 LU, LDU, and Cholesky Decompositions 724
G.5 Jacobian Matrix and the Jacobian 726
G.6 Kronecker and Schur Products 728
G.7 Properties of Trace and Determinant 728
G.8 Matrix Inversion Lemma 729
G.9 Cauchy Schwarz Inequality 730
G.10 Differentiation 730
G.11 Complex Differentiation 731
Further Reading 732
GLOSSARY 733
REFERENCES 743
INDEX 755
PART III Applications in Signal Processing and Communications
Chapters at the Web Site www.wiley.com/go/randomprocesses
10 Communication Systems and Information Theory 771
10.1 Introduction 771
10.2 Transmitter 771
10.2.1 Sampling and Quantization 772
10.2.2 Channel Coding 777
10.2.3 Symbols and Pulse Shaping 778
10.2.4 Modulation 781
10.3 Transmission Channel 783
10.4 Receiver 786
10.4.1 Receive Filter 786
10.4.2 Demodulation 787
10.4.3 Gram Schmidt Orthogonalization 789
10.4.4 Maximum Likelihood Detection 794
10.4.5 Matched Filter Receiver 797
10.4.6 Probability of Error 802
10.5 Information Theory 803
10.5.1 Mutual Information and Entropy 804
10.5.2 Properties of Mutual Information and Entropy 810
10.5.3 Continuous Distributions: Differential Entropy 813
10.5.4 Channel Capacity 818
10.5.5 AWGN Channel 820
Problems 821
Further Reading 824
11 Optimal Filtering www.wiley.com/go/randomprocesses 825
11.1 Introduction 825
11.2 Optimal Linear Filtering 825
11.3 Optimal Filter Applications 827
11.3.1 System Identification 827
11.3.2 Inverse Modeling 827
11.3.3 Noise Cancellation 828
11.3.4 Linear Prediction 828
11.4 Noncausal Wiener Filter 829
11.5 Causal Wiener Filter 831
11.6 Prewhitening Filter 837
11.7 FIR Wiener Filter 839
11.8 Kalman Filter 844
11.8.1 Evolution of the Mean and Covariance 846
11.8.2 State Prediction 846
11.8.3 State Filtering 848
11.9 Steady–State Kalman Filter 851
11.10 Linear Predictive Coding 857
11.11 Lattice Prediction–Error Filter 861
11.12 Levinson Durbin Algorithm 865
11.13 Least–Squares Filtering 868
11.14 Recursive Least–Squares 872
Problems 876
Further Reading 879
12 Adaptive Filtering www.wiley.com/go/randomprocesses 880
12.1 Introduction 880
12.2 MSE Properties 880
12.3 Steepest Descent 889
12.4 Newton s Method 894
12.5 LMS Algorithm 895
12.5.1 Convergence in the Mean 899
12.5.2 Convergence in the Mean–Square 901
12.5.3 Misadjustment 906
12.6 Modified LMS Algorithms 911
12.6.1 Sign–Error LMS Algorithm 911
12.6.2 Sign–Data LMS Algorithm 912
12.6.3 Sign–Sign LMS Algorithm 914
12.6.4 LMF Algorithm 914
12.6.5 Complex LMS Algorithm 916
12.6.6 Leaky LMS Algorithm 917
12.6.7 Normalized LMS Algorithm 918
12.6.8 Perceptron 920
12.6.9 Convergence of Modified LMS Algorithms 922
12.7 Adaptive IIR Filtering 923
12.7.1 Output–Error Formulation 924
12.7.2 Output–Error IIR Filter Algorithm 928
12.7.3 Equation–Error Formulation 932
12.7.4 Equation–Error Bias 933
Problems 936
Further Reading 939
13 Equalization, Beamforming, and Direction Finding www.wiley.com/go/randomprocesses 940
13.1 Introduction 940
13.2 Channel Equalization 941
13.3 Optimal Bussgang Algorithm 943
13.4 Blind Equalizer Algorithms 949
13.4.1 Sato s Algorithm 949
13.4.2 Constant Modulus Algorithm 950
13.5 CMA Performance Surface 952
13.6 Antenna Arrays 958
13.7 Beampatterns 960
13.8 Optimal Beamforming 962
13.8.1 Known Look Direction 962
13.8.2 Multiple Constraint Beamforming 964
13.8.3 Training Signal 966
13.8.4 Maximum Likelihood 968
13.8.5 Maximum SNR and SINR 969
13.9 Adaptive Beamforming 970
13.9.1 LMS Beamforming 970
13.9.2 Constant Modulus Array 970
13.9.3 Decision–Directed Mode 973
13.9.4 Multistage CM Array 974
13.9.5 Output SINR and SNR 977
13.10 Direction Finding 981
13.10.1 Beamforming Approaches 981
13.10.2 MUSIC Algorithm 984
Problems 985
Further Reading 989
JOHN J. SHYNK, PhD, is Professor of Electrical and Computer Engineering at the University of California, Santa Barbara. He was a Member of Technical Staff at Bell Laboratories, and received degrees in systems engineering, electrical engineering, and statistics from Boston University and Stanford University.
An engineering perspective on probability and random processes
Probability, Random Variables, and Random Processes is a comprehensive textbook on probability theory for engineers that provides a more rigorous mathematical framework than is usually encountered in undergraduate courses. It is intended for first–year graduate students who have some familiarity with probability and random variables, though not necessarily of random processes and systems that operate on random signals. It is also appropriate for advanced undergraduate students who have a strong mathematical background.
The book has the following features:
- Several appendices include related material on integration, important inequalities and identities, frequency–domain transforms, and linear algebra. These topics have been included so that the book is relatively self–contained. One appendix contains an extensive summary of 33 random variables and their properties such as moments, characteristic functions, and entropy.
- Unlike most books on probability, numerous figures have been included to clarify and expand upon important points. Over 600 illustrations and MATLAB plots have been designed to reinforce the material and illustrate the various characterizations and properties of random quantities.
- Sufficient statistics are covered in detail, as is their connection to parameter estimation techniques. These include classical Bayesian estimation and several optimality criteria: mean–square error, mean–absolute error, maximum likelihood, method of moments, and least squares.
- The last four chapters provide an introduction to several topics usually studied in subsequent engineering courses: communication systems and information theory; optimal filtering (Wiener and Kalman); adaptive filtering (FIR and IIR); and antenna beamforming, channel equalization, and direction finding. This material is available electronically at the companion website.
Probability, Random Variables, and Random Processes is the only textbook on probability for engineers that includes relevant background material, provides extensive summaries of key results, and extends various statistical techniques to a range of applications in signal processing.
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