Adaptive Wireless Transceivers provides the reader with a broad overview of near-instantaneously adaptive transceivers in the context of TDMA, CDMA and OFDM systems. The adaptive transceivers examined employ powerful turbo codecs, turbo equalisers and space-time codecs, equipping the reader with a future-proof technological road map. It demonstrates that adaptive transceivers are capable of mitigating the channel quality fluctuations of the wireless channel as a lower-complexity alternative to space-time coding. By contrast, if the higher complexity of multiple transmitters and multiple…mehr
Adaptive Wireless Transceivers provides the reader with a broad overview of near-instantaneously adaptive transceivers in the context of TDMA, CDMA and OFDM systems. The adaptive transceivers examined employ powerful turbo codecs, turbo equalisers and space-time codecs, equipping the reader with a future-proof technological road map. It demonstrates that adaptive transceivers are capable of mitigating the channel quality fluctuations of the wireless channel as a lower-complexity alternative to space-time coding. By contrast, if the higher complexity of multiple transmitters and multiple receiver-assisted systems is deemed acceptable, the advantages of adaptability erode. * Provides an in-depth introduction to channel equalisers and Kalman filtering and discusses the associated complexity versus performance trade-offs * Introduces wideband near-instantaneously adaptive transceivers and studies their performance both with and without turbo channel coding * Describes how to optimise adaptive modulation mode switching and highlights a range of practical considerations * Introduces neural network based channel equalisers and discusses Radial Basis Function (RBF) assisted equalisers embedded into adaptive modems supported by turbo channel coding and turbo channel equalisation * Employs the above adaptive principles also in the context of CDMA and OFDM transceivers and discusses the pros and cons of space-time coding versus adaptive modulation Researchers, advanced students and practising development engineers working in wireless communications will all find this valuable text an informative read.Hinweis: Dieser Artikel kann nur an eine deutsche Lieferadresse ausgeliefert werden.
Lajos Hanzo received his degree in electronics in 1976 and his doctorate in 1983. During his 25-year career in telecommunications he has held various research and academic posts in Hungary, Germany and the UK. Since 1986 he has been with the Department of Electronics and Computer Science, University of Southampton, UK, where he holds the chair in telecommunications. He has co-authored eight books on mobile radio communications, published over 300 research papers, organised and chaired conference sessions, presented overview lectures and been awarded a number of distinctions. Currently he is managing an academic research team, working on a range of research projects in the field of wireless multimedia communications sponsored by industry, the Engineering and Physical Sciences Research Council UK, the European IST Programme and the Mobile Virtual Centre of Excellence, UK. He is an enthusiastic supporter of industrial and academic liaison and he offers a range of industrial courses. He is also an IEEE Distinguished Lecturer. For further information on research in progress and associated publications please refer to http://www-mobile.ecs.soton.ac.uk.
Inhaltsangabe
1 Prologue 1 1.1 Motivation of the Book 1 1.2 Adaptation Principles 4 1.3 Channel Quality Metrics 5 1.4 Transceiver Parameter Adaptation 5 1.5 Milestones in Adaptive Modulation History 7 1 .5 . 1 Adaptive Single- and Multi-carrier Modulation 7 1.6 Outline of the book 14 I Near-instantaneously Adaptive Modulation and Filtering Based Equalisation 19 2 Introduction To Equalizers 21 2.1 Coherent Demodulation of Square-QAM 23 2.2 Intersymbol Interference 29 2.3 Basic Equalizer Theory 29 2.4 Signal to Noise Ratio Loss of the DFE 40 2.5 Equalization in Multi-level Modems 41 2.6 Review and Discussion 42 3 Adaptive Equalization 45 3.1 Derivation of the Recursive Kalman Algorithm 46 3.2 Application of the Kalman Algorithm 54 3.3 Complexity Study 71 3.4 Adaptive Equalization in Multilevel Modems 72 3.5 Review and Discussion 77 4 Adaptive Modulation 81 4.1 Adaptive Modulation for Narrow-band Fading Channels 81 4.2 Power Control Assisted Adaptive Modulation 86 4.3 Adaptive Modulation and Equalization in a Wideband Environment 99 4.4 Review and Discussion 119 5 Turbo-Coded and Turbo-Equalised Adaptive Modulation 123 5.1 Turbo Coding 124 5.2 System Parameters 127 5.3 Turbo Block Coding Performance of the Fixed QAM Modes 128 5.4 Fixed Coding Rate, Fixed Interleaver Size Turbo Coded AQAM 131 5.5 Fixed Coding Rate. Variable Interleaver Size Turbo Coded AQAM 135 5.6 Blind Modulation Detection 139 5.7 Variable Coding Rate Turbo Block Coded Adaptive Modulation 146 5.8 Comparisons of the Turbo Block Coded AQAM Schemes 152 5.9 Turbo Convolutional Coded AQAM Schemes 161 5.10 Turbo Equalization 165 5.11 Burst-by-Burst Adaptive Wideband Coded Modulation 173 5.12 Review and Discussion 186 6 Adaptive Modulation Mode Switching Optimization 191 6 .l Introduction 191 6.2 Increasing the Average Transmit Power as a Fading Counter-Measure 192 6.3 System Description 196 6.4 Optimum Switching Levels 203 6.5 Results and Discussions 221 6.6 Review and Discussion 254 7 Practical Considerations of Wideband AQAM 257 7.1 Impact of Error Propagation 257 7.2 Channel Quality Estimation Latency 259 7.3 Effect of CO-channel Interference on AQAM 271 7.4 Review and Discussion 292 I1 Near-instantaneously Adaptive Modulation and Neural Network Based Equalisation 297 8 Neural Network Based Equalization 299 8 .l Discrete Time Model for Channels Exhibiting Intersymbol Interference 299 8.2 Equalization as a Classification Problem 300 8.3 Introduction to Neural Networks 305 8.4 Equalization Using Neural Networks 311 8.5 Multilayer Perceptron Based Equaliser 311 8.6 Polynomial Perceptron Based Equaliser 314 8.7 Radial Basis Function Networks 316 8.8 K-means Clustering Algorithm 329 8.9 Radial Basis Function Network Based Equalisers 330 8.10 Scalar Noise-free Channel Output States 340 8.1 l Decision Feedback Assisted Radial Basis Function Network Equaliser 342 8.12 Simulation Results 354 8.13 Review and Discussion 382 9 RBF-Equalized Adaptive Modulation 385 9 .l Background to Adaptive Modulation in a Narrowband Fading Channel 386 9.2 Background on Adaptive Modulation in a Wideband Fading Channel 389 9.3 Brief Overview of Part I of the Book 390 9.4 Joint Adaptive Modulation and RBF Based Equalization 395 9.5 Performance of the AQAM RBF DFE Scheme 4 10 9.6 Review and Discussion 414 9.4.4 Simulation Model for Best-case Performance 399 10 RBF Equalization Using nrbo Codes 417 10.1 Introduction to Turbo Codes 417 10.2 Jacobian Logarithmic RBF Equalizer 419 10.3 System Overview 423 10.4 Turbo-coded RBF-equalized M-QAM Performance 427 10.5 Channel Quality Measure 432 10.6 Turbo Coding and RBF Equalizer Assisted AQAM 433 10.7 Review and Discussion 452 11 RBF Turbo Equalization 453 1 1 . 1 Introduction to Turbo equalization 453 11.2 RBF Assisted Turbo equalization 455 11.3 Comparison of the RBF and MAP Equaliser 457 11.4 Comparison of the Jacobian RBF and Log-MAP Equaliser 460 1 1.5 RBF Turbo Equaliser Performance 463 1 1.6 Reduced-complexity RBF Assisted Turbo equalization 471 11.7 In-phase/Quadrature-phase Turbo equalization 476 11.8 Turbo Equalized Convolutional and Space Time Trellis Coding 485 11.9 Review and Discussion 493 III Near-Instantaneously Adaptive CDMA and Adaptive Space-Time Coded OFDM 495 12 Burst-by-Burst Adaptive Multiuser Detection CDMA 497 12.1 Motivation 497 12.2 Multiuser Detection 498 12.3 Multiuser Equaliser Concepts 501 12.4 Adaptive CDMA Schemes 518 12.5 Burst-by-Burst AQAM/CDMA 521 12.6 Review and Discussion 533 13 Adaptive Multicarrier Modulation 535 13.1 Introduction 535 13.2 Orthogonal Frequency Division Multiplexing 536 13.3 OFDM Transmission over Frequency Selective Channels 543 13.4 OFDM Performance with Frequency Errors and Timing Errors 547 13.5 Synchronization Algorithms 556 13.6 Adaptive OFDM 563 13.7 Pre-Equalization 579 13.8 Review and Discussion 584 14 Space-Time Coding versus Adaptive Modulation 589 14.1 Introduction 589 14.2 Space-Time Trellis Codes 590 14.3 Space-Time Coded Transmission Over Wideband channels 594 14.4 Simulation Results 603 14.5 Space-Time Coded Adaptive Modulation for OFDM 626 14.6 Review and Discussion 635 15 Conclusions and Suggestions for Further Research 639 15.1 Book Summary and Conclusions 639 15.2 Suggestions for Future Research 649 15.3 Closing Remarks 651 A Appendices 653 Bibliography 687 Index 713 Author Index 723
