This book is devoted to offering a comprehensive and detailed discussion of the design of high-reliability, high-efficiency spectrum utilization, cross-technology support and concurrent backscatter schemes. It begins with the introductory Chapter 1, introducing the background of backscatter communication, including its concepts and characteristics. Then it highlights the potential IoT applications assisted by backscatter communication. The importance of high-reliability, high-efficiency spectrum utilization, cross-technology and concurrent backscatter schemes is emphasized to actualize these applications. Chapters 2 thru 5 discuss in detail how to achieve reliable backscatter (Chapter 2), spectrum-efficient backscatter (Chapter 3), cross-technology backscatter (Chapter 4) and concurrent backscatter (Chapter 5). Chapter 6 summarizes this book and provides a vision for future research directions to bring a broad class of IoT applications into our everyday lives. This book targets scientists, researchers, engineers and advanced-level students studying or working in pervasive computing, IoT, backscatter communication and other related areas. Professionals working in this related field will also want to purchase this book finding it a valuable resource.