Digital Communications with Chaos (eBook)

Multiple Access Techniques and Performance

Francis C. M. Lau, Wai M Tam, Chi K Tse (Autoren)

eBook Download: PDF

2010 | 1. Auflage
256 Seiten
Elsevier Science (Verlag)
978-0-08-046555-5 (ISBN)

Infos

Since the 1970's, there has been a great deal of research effort spent on studying
chaotic systems and the properties of the chaotic signals generated. Characterized by their wideband, impulse-like autocorrelation and low cross-correlation properties, chaotic signals are useful spread-spectrum signals for carrying digital information. Spectrum spreading has become one of the most popular modulation techniques for high-speed wireless communications. It makes use of signals of very wide bandwidth to carry information at relatively low data rates, and possesses advantages such as low probability of interception, resistance to jamming, multiple-access capability and mitigation to multipath effect, which are particularly important in a wireless scenario. In addition to enjoying the aforementioned benefits, chaotic signals can be generated using simple circuitries, thus lowering the cost of transceivers.
Early study of chaos-based communication systems was focused on a single-user case. In the past few years, more effort has been put on investigating systems with multiple-access capability, which is a key feature of spread-spectrum communication systems. This book presents a detailed study of some multiple-access schemes used for chaos-based communications, and evaluates their performance. In addition, the effectiveness of the multiuser detection techniques, whose primary objective is to reduce interference between users and hence improve performance, is evaluated in the context of multiple-access digital communication systems.

* Hot research topic
* Describes communication technologies for the future
* Authors among the pioneers researching in chaos-based communications

---

Since the 1970's, there has been a great deal of research effort spent on studying chaotic systems and the properties of the chaotic signals generated. Characterized by their wideband, impulse-like autocorrelation and low cross-correlation properties, chaotic signals are useful spread-spectrum signals for carrying digital information. Spectrum spreading has become one of the most popular modulation techniques for high-speed wireless communications. It makes use of signals of very wide bandwidth to carry information at relatively low data rates, and possesses advantages such as low probability of interception, resistance to jamming, multiple-access capability and mitigation to multipath effect, which are particularly important in a wireless scenario. In addition to enjoying the aforementioned benefits, chaotic signals can be generated using simple circuitries, thus lowering the cost of transceivers. Early study of chaos-based communication systems was focused on a single-user case. In the past few years, more effort has been put on investigating systems with multiple-access capability, which is a key feature of spread-spectrum communication systems. Digital Communications with Chaos presents a detailed study of some multiple-access schemes used for chaos-based communications, and evaluates their performance. In addition, the effectiveness of the multiuser detection techniques, whose primary objective is to reduce interference between users and hence improve performance, is evaluated in the context of multiple-access digital communication systems. - Hot research topic- Describes communication technologies for the future- Authors among the pioneers researching in chaos-based communications

Inhalt

Front cover 1
Title page 4
Copyright page 5
Preface 8
Contents 10
1. Introduction 14
1.1 Chaos 14
1.2 Spread-Spectrum Communication Systems 15
1.3 Application of Chaos to Spread-Spectrum Communication Systems 18
1.4 Motivation 21
1.5 Book Organization 22
2 Chaos-Based Digital Communication Systems 24
2.1 Chaos-Based Digital Modulation and Demodulation Schemes 25
2.2 Application to the Multiple-Access Systems 39
2.3 Summary 44
3 Multiple-Access Coherent Antipodal Chaos-Shift-Keying Systems 46
3.1 Introduction 46
3.2 Multiple-Access Antipodal Chaos-Shift-Keying (MA-ACSK) System 47
3.3 Analysis of the MA-ACSK System Based on Gaussian Approximation 49
3.4 Exact Bit Error Rate Analysis of the MA-ACSK System 51
3.5 Results and Discussions 55
3.6 Summary 61
Appendix 3A. Derivation of the statistical properties for the chaotic sequences generated by the Chebyshev map 62
4 Multiuser Detection Techniques for Multiple-Access Coherent Antipodal Chaos-Shift-Keying Systems 68
4.1 Introduction 68
4.2 Linear Multiuser Detection Techniques 69
4.3 Nonlinear Multiuser Detection Techniques 96
4.4 Summary 106
Appendix 4A. Derivation of means and variances relevant to the analyses of the decorrelating detector and MMSE detector 106
Appendix 4B. Derivation of means, variances and covariances relevant to the analysis of the decorrelating detector 113
Appendix 4C. Derivation of covariances and mean relevant to the analysis of the MMSE detector 116
Appendix 4D. Calculation of the probability of occurrence of Ne(n-1)(j) for the PIC detector 119
5 Multiple-Access Generalized Correlation Delay-Shift-Keying Systems 124
5.1 Review of Correlation-Delay-Shift-Keying (CDSK) Scheme 125
5.2 Generalized Correlation-Delay-Shift-Keying (GCDSK) Scheme 128
5.3 Multiple-Access GCDSK Scheme 139
5.4 Summary 148
Appendix 5A. Expressions for the variables in the GCDSK system 151
Appendix 5B. Derivation of bit error rates for GCDSK system based on simple Gaussian approximation 154
Appendix 5C. Derivation of bit error rates for CDSK system based on simple Gaussian approximation 161
Appendix 5D. Expressions for the variables in the MA-GCDSK system 162
Appendix 5E. Derivation of bit error rates for MA-GCDSK system 167
6 Enhancements of Correlation-Delay-Shift-Keying Scheme 170
6.1 Enhanced Correlation-Delay-Shift-Keying System with Method One 171
6.2 Enhanced Correlation-Delay-Shift-Keying System with Method Two 177
6.3 Permutation-Based Multiple-Access CDSK Systems 182
6.4 Results and Discussions 189
6.5 Summary 196
7 Multiple-Access Scheme Utilizing Transmitted References And Training Sequences 200
7.1 Transmitter Structure 200
7.2 Receiver Structures 202
7.3 Results and Discussions 210
7.4 Summary 221
8 Near-Optimum Communication Schemes 222
8.1 Near-Optimum Coherent (NOC) and Noncoherent (NON) Systems 223
8.2 Near-Optimum Noncoherent System with Transmitted Reference 227
8.3 Results and Discussions 230
8.4 Summary 241
Bibliography 242
Index 248

Produkt-Details

• Erscheint lt. Verlag: 7.7.2010
• Sprache: englisch
• Themenwelt: Mathematik / Informatik ► Informatik
• Themenwelt: Naturwissenschaften ► Physik / Astronomie ► Elektrodynamik
• Themenwelt: Technik ► Bauwesen
• Themenwelt: Technik ► Elektrotechnik / Energietechnik
• ISBN-10: 0-08-046555-2 / 0080465552
• ISBN-13: 978-0-08-046555-5 / 9780080465555