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Modern wireless communications
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Upper Saddle River, NJ : Pearson, 2005
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9780130224729
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30000010060009 TK5103.2 H39 2005 Open Access Book Book
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Summary

Summary

This book provides a self-motivating introduction to wireless communications; it presents topics in a manner consistent with their natural evolution, based on the principle of increasing spectral efficiency of the radio transmission. TOPICS: Wireless Systems begins with a discussion of FDMA systems and follows with the evolution through TDMA, CDMA, and SDMA techniques. Engineering principles required for each multiple access strategy are presented parallel to it. For electrical engineers and others involved in wireless communications.


Excerpts

Excerpts

The rapid growth of wireless communications and its pervasive use in all walks of life are changing the way we communicate in some fundamental ways. Most important, reliance on radio propagation as the physical mechanism responsible for the transport of information-bearing signals from the transmitter to the receiver has endowed communications with a distinctive feature, namely, mobility. Modern Wireless Communications is a new book aimed at the teaching of a course that could follow a traditional course on communication systems, as an integral part of an undergraduate program in electrical engineering or as the first graduate course on wireless communications. The primary focus of the book is on the physical layer, emphasizing the fundamentals of radio propagation and communication-theoretic aspects of multiple-access techniques. Many aspects of wireless communications are covered in an introductory level and book form for the first time. 1. ORGANIZATION OF THE BOOK The book is organized in seven chapters, nine appendices, and a bibliography. Chapter 1 motivates the study of wireless communications. It begins with a brief historical account of wireless communications, and then goes on to describe the OSI model of communication networks. The discussion, however, focuses on the issues that arise in the study of the physical layer, which is the mainstay of the book. Chapter 2 on radio propagation starts with an explanation of the physical mechanisms of the propagation process, including free-space propagation, reflection, and diffraction. These physical mechanisms provide insight into the statistical models that are employed for terrestrial and indoor propagation effects that follow. The small-scale effects of fading and uncorrelated scattering are discussed, leading up to a careful classification of the different wireless channel types. The second half of the chapter describes noise and interference, and how combined with propagation, we may determine wireless communication system performance through a link-budget analysis. Chapter 3 reviews the modulation process with emphasis on digital transmission techniques. This introductory treatment of modulation paves the way for discussions of the following issues: Complex baseband representation of linear modulated signals, and the corresponding input/output descriptions of linear wireless communication channels and linear band-pass filters. • Practical problems concerning adjacent channel interference and nonlinearities in transmit power amplifiers. The stage is then set for comparative evaluation of various modulation strategies for wireless communications, discussion of receiver performance in the presence of channel noise and Rayleigh fading, and discussion of frequency-division multiple-access (FDMA). Chapter 4 focuses on coding techniques and time-division multiple-access (TDMA). After a brief review of Shannon's classical information theory, the source coding of speech signals is discussed, which is then followed by fundamental aspects of convolutional codes, interleavers, and turbo codes. The relative merits of convolutional codes and turbo codes are discussed in the context of wireless communications. The various aspects of channel-estimation, tracking, and channel equalization are treated in detail. The discussion then moves onto TDMA and the advantages it offers over FDMA. Chapter 5 discusses spread spectrum, code-division multiple-access (CDMA), and cellular systems. It first presents the basics of spread-spectrum systems, namely, direct-sequence, and frequency-hopped systems, and their tolerance to interference. A fundamental component of spread-spectrum systems is the spreading code: a section of the chapter is devoted to explaining Walsh-Hadamard, maximal-length sequences, Gold codes, and random sequences. This discussion is then followed with a description of RAKE receivers, channel estimation, code synchronization, and the multipath performance of direct-sequence systems. This leads naturally to a discussion of how direct-sequence systems perform in a cellular environment. Chapter 6 is devoted to the notion of space diversity and related topics. It starts with diversity on receive, which represents the traditional technique for mitigating the fading problem that plagues wireless communications. Then the chapter introduces the powerful notion of multiple-input, multiple-output (MIMO) wireless communications, which includes space diversity on receive and space diversity on transmit as special cases. Most important, the use of MIMO communications represents the "spatial frontier" of wireless communications in that, for prescribed communication resources in the form of fixed transmit power and channel bandwidth, it provides the practical means for significant increases in the spectral efficiency of wireless communications at the expense of increased computational complexity. The discussion of MIMO wireless communications also includes orthogonal space-time block codes (STBC), best exemplified by the Alamouti code and its differential form. The discussion then moves onto space-division multiple access (SDMA), and smart antennas. Chapter 7 links the physical layer and multiple-access topics of the previous chapters with the higher layers of the communications network. This final chapter of the book begins with a comparison of the different multiple-access strategies. The discussion then leads to a consideration of various link-management functions associated with wireless systems, namely, signaling, power control, and handover. The differences between systems used for telephony and those used for data transmission are clearly delineated. This is then followed by a discussion of wireless network architectures, both for telephony and data applications. 1.1 Theme Examples An enriching feature of the book is the inclusion of Theme Examples within each of the chapters in the book, except for Chapter 1. In a loose sense, they may be viewed as "Chapters within Chapters" that show the practical applications of the topics discussed in the pertinent chapters. Specifically, the following Theme Examples are discussed: Chapter 2: Empirical propagation model, wireless local area networks (LANs), and impulse radio and ultra-wideband Chapter 4: Global system for mobile (GSM) communications, joint equalization and decoding, and random-access techniques Chapter 5: Code-division multiple access (CDMA) Standard IS-95, GPSS, bluetooth, wideband CDMA and WiFi Chapter 6: BLAST architectures, diversity, space-time block codes, and V-BLAST, and keyhole channels Chapter 7: Wireless telephone network standards, wireless data network standards, and IEEE 801.11 MAC 1.2 Appendices To provide supplementary material for the book, nine appendices are included: Fourier theory Bessel functions Random variables and random processes Matched filters Error function Maximum a posteriori probability (MAP) decoding Capacity of MIMO links Eigendecomposition Adaptive antenna array The inclusion of these appendices is intended to make the book essentially self-sufficient. 1.3 Other Features of the Book Each chapter includes "within-text" problems that are intended to help the reader develop an improved understanding of the issues being discussed in the text. "End-of-chapter" problems provide an abundance of additional problems, whose solutions will further help the reader develop a deeper understanding of the material covered in the pertinent chapter. Moreover, each chapter includes examples with detailed solutions covering different aspects of the subject matter. "Notes and References" included at the end of the chapter provide explanatory notes, and they guide the reader to related references for further reading. All the references so made are assembled in the Bibliography placed at the end of the book. Excerpted from Modern Wireless Communications by Michael Moher, Simon Haykin All rights reserved by the original copyright owners. Excerpts are provided for display purposes only and may not be reproduced, reprinted or distributed without the written permission of the publisher.

Table of Contents

Prefacep. xiii
Chapter 1 Introductionp. 1
1.1 Backgroundp. 1
1.2 Communication Systemsp. 3
1.3 The Physical Layerp. 3
1.4 The Data-Link Layerp. 5
1.4.1 FDMAp. 5
1.4.2 TDMAp. 6
1.4.3 CDMAp. 7
1.4.4 SDMAp. 8
1.5 Overview of the Bookp. 8
Notes and Referencesp. 10
Chapter 2 Propagation and Noisep. 11
2.1 Introductionp. 11
2.2 Free-Space Propagationp. 13
2.2.1 Isotropic Radiationp. 13
2.2.2 Directional Radiationp. 15
2.2.3 The Friis Equationp. 18
2.2.4 Polarizationp. 19
2.3 Terrestrial Propagation: Physical Modelsp. 19
2.3.1 Reflection and the Plane-Earth Modelp. 20
2.3.2 Diffractionp. 24
2.3.3 Diffraction Lossesp. 28
2.4 Terrestrial Propagation: Statistical Modelsp. 30
2.4.1 Median Path Lossp. 30
2.4.2 Local Propagation Lossp. 32
2.5 Indoor Propagationp. 33
2.6 Local Propagation Effects with Mobile Radiop. 36
2.6.1 Rayleigh Fadingp. 36
2.6.2 Rician Fadingp. 40
2.6.3 Dopplerp. 42
2.6.4 Fast Fadingp. 44
2.7 Channel Classificationp. 48
2.7.1 Time-Selective Channelsp. 50
2.7.2 Frequency-Selective Channelsp. 52
2.7.3 General Channelsp. 52
2.7.4 WSSUS Channelsp. 54
2.7.5 Coherence Timep. 57
2.7.6 Power-Delay Profilep. 58
2.7.7 Coherence Bandwidthp. 60
2.7.8 Stationary and Nonstationary Channelsp. 61
2.7.9 Summary of Channel Classificationp. 62
2.8 Noise and Interferencep. 63
2.8.1 Thermal Noisep. 63
2.8.2 Equivalent Noise Temperature and Noise Figurep. 66
2.8.3 Noise in Cascaded Systemsp. 68
2.8.4 Man-Made Noisep. 70
2.8.5 Multiple-Access Interferencep. 71
2.9 Link Calculationsp. 75
2.9.1 Free-Space Link Budgetp. 75
2.9.2 Terrestrial Link Budgetp. 80
2.10 Theme Example 1: Okumura-Hata Empirical Modelp. 82
2.11 Theme Example 2: Wireless Local Area Networksp. 85
2.11.1 Propagation Modelp. 85
2.11.2 Receiver Sensitivityp. 85
2.11.3 Rangep. 86
2.11.4 Power-Delay Profilep. 86
2.11.5 Modulationp. 88
2.12 Theme Example 3: Impulse Radio and Ultra-Widebandp. 89
2.13 Summary and Discussionp. 94
Notes and Referencesp. 95
Additional Problemsp. 96
Chapter 3 Modulation and Frequency-Division Multiple Accessp. 103
3.1 Introductionp. 103
3.2 Modulationp. 105
3.2.1 Linear and Nonlinear Modulation Processesp. 106
3.2.2 Analog and Digital Modulation Techniquesp. 107
3.2.3 Amplitude and Angle Modulation Processesp. 107
3.3 Linear Modulation Techniquesp. 108
3.3.1 Amplitude Modulationp. 108
3.3.2 Binary Phase-Shift Keyingp. 110
3.3.3 Quadriphase-Shift Keyingp. 112
3.3.4 Offset Quadriphase-Shift Keyingp. 114
3.3.5 [pi]/4-Shifted Quadriphase-Shift Keyingp. 116
3.4 Pulse Shapingp. 116
3.4.1 Root Raised-Cosine Pulse Shapingp. 119
3.5 Complex Representation of Linear Modulated Signals and Band-Pass Systemsp. 122
3.5.1 Complex Representation of Linear Band-Pass Systemsp. 124
3.6 Signal-Space Representation of Digitally Modulated Signalsp. 126
3.7 Nonlinear Modulation Techniquesp. 130
3.7.1 Frequency Modulationp. 130
3.7.2 Binary Frequency-Shift Keyingp. 132
3.7.3 Continuous-Phase Modulation: Minimum Shift Keyingp. 133
3.7.4 Power Spectra of MSK Signalp. 137
3.7.5 Gaussian-Filtered MSKp. 139
3.8 Frequency-Division Multiple Accessp. 142
3.9 Two Practical Issues of Concernp. 144
3.9.1 Adjacent Channel Interferencep. 144
3.9.2 Power Amplifier Nonlinearityp. 146
3.10 Comparison of Modulation Strategies for Wireless Communicationsp. 148
3.10.1 Linear Channelsp. 148
3.10.2 Nonlinear Channelsp. 150
3.11 Channel Estimation and Trackingp. 151
3.11.1 Differential Detectionp. 152
3.11.2 Pilot Symbol Transmissionp. 154
3.12 Receiver Performance: Bit Error Ratep. 158
3.12.1 Channel Noisep. 158
3.13 Theme Example 1: Orthogonal Frequency-Division Multiplexingp. 162
3.13.1 Cyclic Prefixp. 167
3.14 Theme Example 2: Cordless Telecommunicationsp. 168
3.15 Summary and Discussionp. 170
Notes and Referencesp. 171
Additional Problemsp. 173
Chapter 4 Coding and Time-Division Multiple Accessp. 179
4.1 Introductionp. 179
4.2 Samplingp. 182
4.3 Why Follow Sampling with Coding?p. 184
4.4 Shannon's Information Theoryp. 185
4.4.1 Source-Coding Theoremp. 185
4.4.2 Channel-Coding Theoremp. 186
4.4.3 Information Capacity Theoremp. 187
4.4.4 Rate Distortion Theoryp. 188
4.5 Speech Codingp. 189
4.5.1 Linear Predictionp. 189
4.5.2 Multipulse Excited LPCp. 190
4.5.3 Code-Excited LPCp. 192
4.6 Error-Control Codingp. 193
4.6.1 Cyclic Redundancy Check Codesp. 194
4.7 Convolutional Codesp. 195
4.7.1 Trellis and State Diagrams of Convolutional Codesp. 198
4.7.2 Free Distance of a Convolutional Codep. 200
4.8 Maximum-Likelihood Decoding of Convolutional Codesp. 201
4.9 The Viterbi Algorithmp. 203
4.9.1 Modifications of the Viterbi Algorithmp. 205
4.10 Interleavingp. 207
4.10.1 Block Interleavingp. 208
4.10.2 Convolutional Interleavingp. 210
4.10.3 Random Interleavingp. 212
4.11 Noise Performance of Convolutional Codesp. 212
4.12 Turbo Codesp. 215
4.12.1 Turbo Encodingp. 215
4.12.2 Turbo Decodingp. 216
4.12.3 Noise Performancep. 218
4.12.4 Maximum a Posteriori Probability Decodingp. 219
4.13 Comparison of Channel-Coding Strategies for Wireless Communicationsp. 222
4.13.1 Encodingp. 223
4.13.2 Decodingp. 224
4.13.3 AWGN Channelp. 225
4.13.4 Fading Wireless Channelsp. 225
4.13.5 Latencyp. 225
4.13.6 Joint Equalization and Decodingp. 226
4.14 RF Modulation Revisitedp. 226
4.15 Baseband Processing for Channel Estimation and Equalizationp. 227
4.15.1 Channel Estimationp. 229
4.15.2 Viterbi Equalizationp. 231
4.16 Time-Division Multiple Accessp. 233
4.16.1 Advantages of TDMA over FDMAp. 234
4.16.2 TDMA Overlaid on FDMAp. 235
4.17 Theme Example 1: GSMp. 236
4.18 Theme Example 2: Joint Equalization and Decodingp. 239
4.18.1 Computer Experimentp. 241
4.19 Theme Example 3: Random-Access Techniquesp. 243
4.19.1 Pure Alohap. 243
4.19.2 Slotted Alohap. 245
4.19.3 Carrier-Sense Multiple Accessp. 245
4.19.4 Other Considerations with Random-Access Protocolsp. 248
4.20 Summary and Discussionp. 249
Notes and Referencesp. 251
Additional Problemsp. 252
Chapter 5 Spread Spectrum and Code-Division Multiple Accessp. 258
5.1 Introductionp. 258
5.2 Direct-Sequence Modulationp. 260
5.2.1 The Spreading Equationp. 260
5.2.2 Matched-Filter Receiverp. 262
5.2.3 Performance with Interferencep. 263
5.3 Spreading Codesp. 265
5.3.1 Walsh-Hadamard Sequencesp. 267
5.3.2 Orthogonal Variable Spreading Factorsp. 269
5.3.3 Maximal-Length Sequencesp. 270
5.3.4 Scramblersp. 274
5.3.5 Gold Codesp. 274
5.3.6 Random Sequencesp. 276
5.4 The Advantages of CDMA for Wirelessp. 279
5.4.1 Multiple-Access Interferencep. 279
5.4.2 Multipath Channelsp. 283
5.4.3 RAKE Receiverp. 284
5.4.4 Fading Channelsp. 288
5.4.5 Summary of the Benefits of DS-SSp. 289
5.5 Code Synchronizationp. 290
5.6 Channel Estimationp. 292
5.7 Power Control: The Near-Far Problemp. 294
5.8 FEC Coding and CDMAp. 297
5.9 Multiuser Detectionp. 299
5.10 CDMA in a Cellular Environmentp. 301
5.11 Frequency-Hopped Spread Spectrump. 306
5.11.1 Complex Baseband Representation of FH-SSp. 307
5.11.2 Slow-Frequency Hoppingp. 308
5.11.3 Fast-Frequency Hoppingp. 310
5.11.4 Processing Gainp. 310
5.12 Theme Example 1: IS-95p. 311
5.12.1 Channel Protocolp. 311
5.12.2 Pilot Channelp. 313
5.12.3 Downlink CDMA Channelsp. 314
5.12.4 Power Controlp. 316
5.12.5 Cellular Considerationsp. 317
5.12.6 Uplinkp. 318
5.13 Theme Example 2: GPSSp. 319
5.14 Theme Example 3: Bluetoothp. 321
5.15 Theme Example 4: WCDMAp. 323
5.15.1 Bandwidth and Chip Ratep. 324
5.15.2 Data Rates and Spreading Factorp. 324
5.15.3 Modulation and Synchronizationp. 324
5.15.4 Forward Error-Correction Codesp. 324
5.15.5 Channel Typesp. 325
5.15.6 Uplinkp. 325
5.15.7 Downlinkp. 326
5.15.8 Multicode Transmissionp. 327
5.15.9 Cellular Considerationsp. 327
5.16 Theme Example 5: Wi-Fip. 328
5.17 Summary and Discussionp. 331
Notes and Referencesp. 332
Additional Problemsp. 333
Chapter 6 Diversity, Capacity, and Space-Division Multiple Accessp. 339
6.1 Introductionp. 339
6.2 "Space Diversity on Receive" Techniquesp. 341
6.2.1 Selection Combiningp. 341
6.2.2 Maximal-Ratio Combiningp. 346
6.2.3 Equal-Gain Combiningp. 353
6.2.4 Square-Law Combiningp. 353
6.3 Multiple-Input, Multiple-Output Antenna Systemsp. 357
6.3.1 Coantenna Interferencep. 358
6.3.2 Basic Baseband Channel Modelp. 360
6.4 MIMO Capacity for Channel Known at the Receiverp. 363
6.4.1 Ergodic Capacityp. 363
6.4.2 Two Other Special Cases of the Log-Det Formula: Capacities of Receive and Transmit Diversity Linksp. 366
6.4.3 Outage Capacityp. 367
6.4.4 Channel Known at the Transmitterp. 371
6.5 Singular-Value Decomposition of the Channel Matrixp. 371
6.5.1 Eigendecomposition of the Log-det Capacity Formulap. 374
6.6 Space-Time Codes for MIMO Wireless Communicationsp. 376
6.6.1 Preliminariesp. 378
6.6.2 Alamouti Codep. 379
6.6.3 Performance Comparison of Diversity-on-Receive and Diversity-on-Transmit Schemesp. 387
6.6.4 Generalized Complex Orthogonal Space-Time Block Codesp. 389
6.6.5 Performance Comparisons of Different Space-Time Block Codes Using a Single Receiverp. 392
6.7 Differential Space-Time Block Codesp. 395
6.7.1 Differential Space-Time Block Codingp. 395
6.7.2 Transmitter and Receiver Structuresp. 401
6.7.3 Noise Performancep. 402
6.8 Space-Division Multiple Access and Smart Antennasp. 404
6.8.1 Antenna Arraysp. 406
6.8.2 Multipath with Directional Antennasp. 412
6.9 Theme Example 1: BLAST Architecturesp. 415
6.9.1 Diagonal-BLAST Architecturep. 416
6.9.2 Vertical-BLAST Architecturep. 417
6.9.3 Turbo-BLAST Architecturep. 419
6.9.4 Experimental Performance Evaluation of Turbo-BLAST versus V-BLASTp. 422
6.10 Theme Example 2: Diversity, Space-Time Block Codes, and V-BLASTp. 426
6.10.1 Diversity-on-Receive versus Diversity-on-Transmitp. 426
6.10.2 Space-Time Block Codes versus V-BLASTp. 427
6.10.3 Diversity Order and Multiplexing Gainp. 429
6.11 Theme Example 3: Keyhole Channelsp. 432
6.12 Summary and Discussionp. 436
Notes and Referencesp. 439
Additional Problemsp. 441
Chapter 7 Wireless Architecturesp. 450
7.1 Introductionp. 450
7.2 Comparison of Multiple-Access Strategiesp. 450
7.3 OSI Reference Modelp. 454
7.4 The OSI Model and Wireless Communicationsp. 457
7.5 MAC Sublayer Signaling and Protocolsp. 458
7.6 Power Controlp. 461
7.6.1 Open Loopp. 462
7.6.2 Closed Loopp. 463
7.6.3 Outer-Loop Power Controlp. 464
7.6.4 Other Considerationsp. 464
7.7 Handoverp. 465
7.7.1 Handover Algorithmsp. 465
7.7.2 Multiple-Access Considerationsp. 466
7.8 Network Layerp. 467
7.8.1 Cellular Networksp. 467
7.8.2 Indoor LANsp. 469
7.9 Theme Example 1: Wireless Telephone Network Standardsp. 470
7.10 Theme Example 2: Wireless Data Network Standardsp. 472
7.11 Theme Example 3: IEEE 802.11 MACp. 473
7.12 Summary and Discussionp. 475
Notes and Referencesp. 476
Problemsp. 476