This book provides a comprehensive and accessible introduction to enhanced non-contact wireless sensing using widely available commercial devices such as Wi-Fi, RFID, and LoRa. The authors demonstrate how everyday wireless signals can be transformed into powerful tools for sensing human activities, health conditions, and environmental changes without requiring wearable devices or cameras. The book explains the fundamental principles behind wireless sensing and addresses key practical challenges—including sensing blind spots, limited coverage, reduced accuracy in complex environments, and hardware-induced instability—through a unified framework that integrates signal processing, modeling, and system design. By bridging theory with real-world implementation, the book offers readers clear insights and practical guidance for developing scalable, robust, and privacy-friendly sensing systems for next-generation intelligent applications.

Lili Chen received the Ph.D. degree from Northwest University in 2021. She visited UMass Amherst from 2019 to 2020. She was a Post-Doctoral Research Associate with Tsinghua University from 2022 to 2024. She is currently a Professor with the School of Electronics and Information, Northwestern Polytechnical University. Her current research focuses on smart IoT, wireless communication, wireless sensing. She has published more than 30 papers at top-tier peer-reviewed conferences and journals including NSDI, MobiCom, MobiSys, SenSys, UbiComp, INFOCOM, Globecom, TON, TMC, TCOM, etc.

Xiaojiang Chen received the Ph.D. degree in computer software and theory from Northwest University in 2010. He is currently a professor with the School of Information Science and Technology, Northwest University. His current research interests include RF-based sensing and performance issues in Internet of Things.

Ling Wang received the Ph.D. degree from Xidian University in 2004. He was with Siemens and Nokia Siemens Networks from 2004 to 2007. He has been a Professor with Northwestern Polytechnical University since 2007. He currently serves as Vice President of Northwestern Polytechnical University. His current research interests include array processing and smart antennas, wideband communications, cognitive radio, adaptive antijamming for satellite communications, satellite navigation, and date link systems. He received the National Talents Award in 2021.