Wireless technology supports voice, data, and video communications between portable devices anywhere in the world, and underpins revolutionary applications such as sensor networks, telemedicine, and automated vehicles. This book provides a comprehensive introduction to the principles, design techniques and analytical tools of wireless communications, focusing primarily on the design of practical systems. The book begins with an overview of wireless systems and standards. The characteristics of the wireless channel are then described, including capacity limits. Various modulation and coding schemes are then discussed in detail, including state-of-the-art adaptive modulation and diversity techniques. The concluding chapters deal with multiple and random access in wireless networks, cellular system design, and ad-hoc network design. Physical insights and design issues are emphasized throughout the book. It contains many homework exercises and is an ideal textbook for students taking courses on wireless communications. It is also a valuable reference for engineers in the wireless industry.