Terrestrial Wireless Optical Communication

Terrestrial Wireless Optical Communication

by Devi Chadha

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Overview

Terrestrial Wireless Optical Communication by Devi Chadha

A practical guide to next-generation wireless terrestrial optical communication through the atmospheric channel

Terrestrial Wireless Optical Communication provides in-depth details on free space optics (FSO), from basic concepts to design implementation. The book explains channel characteristics in the near-IR and IR range of the spectrum, atmospheric channel models, modulation and detection techniques, optimal performance, capacity enhancement methods, and forward-error coding schemes. Link and system design issues, reliability, and safety standards are also discussed. The information in this essential guide enables you to deliver cost-effective and transparent wireless network interoperability and expandability.


Coverage includes:

  • Introduction—optical wireless communication systems
  • Wireless optical channels
  • Channel modeling
  • Modulation techniques
  • Diversity and detection techniques in optical fading channels
  • Channel capacity
  • Coding in FSO channels
  • FSO link and system design


Product Details

ISBN-13: 9780071818759
Publisher: McGraw-Hill Professional Publishing
Publication date: 04/19/2013
Pages: 256
Product dimensions: 6.10(w) x 9.10(h) x 0.80(d)

About the Author

Devi Chadha, PhD, is Professor in the Department of Electrical Engineering at Indian Institute of Technology, Delhi. Her current research interests are in the area of Optical Free Space and Optical Fiber Communication systems and networks.

Table of Contents

Preface vii

Acknowledgements ix

1 Introduction-Optical Wireless Communication Systems 1

1.1 Advantages and Disadvantages 3

1.2 Classification 4

1.3 Future Scope of FSO 11

1.4 Structure of the Book 12

References 13

2 Wireless Optical Channels 15

2.1 Free Space Optics Outdoor Channels 16

2.2 Propagation in Terrestrial Link 16

2.3 Wireless Optical Space Links 29

2.4 Indoor Propagation Media 30

Summary 32

References 32

Further Reading 33

3 Channel Modeling 35

3.1 Large and Small-Scale Signal Variation 36

3.2 Input/Output Model of the Optical Intensity Wireless Channel 37

3.3 Statistical Channel Modeling of FSO 43

3.4 System Optical Transfer Function 53

3.5 Indoor Channel Modeling 55

3.6 Modeling Noise Sources in FSO 62

Summary 62

References 63

4 Modulation Techniques 65

4.1 Constraints of the Channel 66

4.2 Types of Modulation Schemes 66

4.3 Selection Criteria 67

4.4 Vector Channel Modeling and Optimum Detection 68

4.5 Minimum Power and Spectral Bandwidth 72

4.6 Modulation Schemes Used in FSO Systems 75

Summary 93

References 94

Further Reading 95

5 Diversity and Detection Techniques in Optical Fading Channel 97

5.1 Detection in an Optical Fading Channel 98

5.2 Signal Models for Detection 102

5.3 Detection in Single Input Single Output Turbulence Channels 104

5.4 Diversity 107

5.5 Spatial Diversity 107

5.6 MIMO Channel 112

Summary 125

References 126

6 Channel Capacity 128

6.1 Channel Capacity of AWGN Channel 129

6.2 Capacity of Fading Channels 134

6.3 Channel Capacity of Single-Input Single-Output Atmospheric Optical Channel 137

6.4 Capacity of Optical Fading Channels with Diversity 142

6.5 Capacity of Photon Poisson Channels 153

References 158

7 Coding in FSO Channels 160

7.1 Basic Concepts 162

7.2 Linear Block Codes 164

7.3 Tree Codes or Convolution Codes 170

7.4 Turbo Codes 175

7.5 Low Density Parity Check Codes 181

Summary 191

References 192

8 FSO Link and System Design 194

8.1 Link Design 195

8.2 Component Reliability 203

8.3 Eye Safety Consideration 204

8.4 Transceivers 207

8.5 Noise in FSO Receiver 221

Summary 222

References 222

Index 227

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