Provides a detailed analysis of the standards and technologies enabling applications for the wireless Internet of Things

The Wireless Internet of Things: A Guide to the Lower Layerspresents a practitioners perspective toward the Internet of Things (IoT) focusing on over-the-air interfaces used by applications such as home automation, sensor networks, smart grid, and healthcare. The authora noted expert in the fieldexamines IoT as a protocol-stack detailing the physical layer of the wireless links, as both a radio and a modem, and the media access control (MAC) that enables communication in congested bands. Focusing on low-power wireless personal area networks (WPANs) the text outlines the physical and MAC layer standards used by ZigBee, Bluetooth LE, Z-Wave, and Thread. The text deconstructs these standards and provides background including relevant communication theory, modulation schemes, and access methods.

The author includes a discussion on Wi-Fi and gateways, and explores their role in IoT. He introduces radio topologies used in software-defined radio implementations for the WPANs. The book also discusses channel modelling and link budget analysis for WPANs in IoT. This important text:

Written for IoT application and platform developers as well as digital signal processing, network, and wireless communication engineers;The Wireless Internet of Things: A Guide to the Lower Layersoffers an inclusive overview of the complex field of wireless IoT, exploring its beneficial applications that are proliferating in a variety of industries.

DANIEL CHEW is a member of the Senior Professional Staff at The John Hopkins University Applied Physics Laboratory and teaches in the Engineering for Professionals program at The John Hopkins University, USA. He received a Bachelor's degree in Electrical Engineering from the University of Delaware and a Masters in Science in Electrical and Computer Engineering from The Johns Hopkins University. His current research interests include wireless devices and applications.

Preface vii

Acknowledgments ix

About the Author xi

1 Introduction1

1.1 What is the Internet of Things? 1

1.2 What is the Wireless Internet of Things? 4

1.3 Wireless Networks 5

1.4 What is the Role of Wireless Standards in the Internet of Things? 10

1.5 Protocol Stacks 10

1.6 Introduction to the Protocols for the Wireless Internet of Things 16

1.7 The Approach of this Book 17

References 18

2 Protocols of the Wireless Internet of Things21

2.1 Bluetooth 22

2.2 ITU G.9959 29

2.3 Z-Wave 32

2.4 IEEE 802.15.4 33

2.5 The ZigBee Specification 38

2.6 Thread 40

2.7 Wi-Fi 41

References 44

3 Radio Layer47

3.1 The Wireless System 47

3.2 Basic Transceiver Model 48

3.3 The Basics of Channels 67

3.4 Bit and Symbol Error Rate 74

3.5 Complex Channels 76

References 81

4 Modem Layer83

4.1 The Signal Model 84

4.2 Pulse Shaping 90

4.3 Modulation Techniques 95

4.4 Synchronization 120

4.5 Spread Spectrum 132

References 137

5 MAC Layer139

5.1 Bands and Spectrum Planning 140

5.2 Spectrum Access for the Wireless IoT 144

5.3 Multiple Access Techniques 145

5.4 Spread Spectrum as Multiple Access 153

5.5 Error Detection and Correction 154

5.6 Energy Efficiency 167

References 170

6 Conclusion173

6.1 Selecting the Right Standard 173

6.2 Higher Layer Standardization and the Future of IoT 175

Index 177