K. J. Ray Liu is Christine Kim Eminent Professor of Information Technology in the Department of Electrical and Computer Engineering at the University of Maryland, College Park. A Highly Cited Researcher, he is a Fellow of the Institute of Electrical and Electronics Engineers (IEEE) and the American Association for the Advancement of Science (AAAS), IEEE Vice President, Technical Activities, and a former President of the IEEE Signal Processing Society. He is a recipient of the 2016 IEEE Leon K. Kirchmayer Award, the IEEE Signal Processing Society 2014 Society Award, and the IEEE Signal Processing Society 2009 Technical Achievement Award. He has also co-authored several books, including Cooperative Communications and Networking (Cambridge, 2008). Beibei Wang is Chief Scientist in Wireless at Origin Wireless, Inc., and is also affiliated with the University of Maryland. She has been a recipient of the Outstanding Graduate School Fellowship, the Future Faculty Fellowship, the Dean's Doctoral Research Award from the University of Maryland, and the Overview Paper Award from the IEEE Signal Processing Society in 2015. She has co-authored Cognitive Radio Networking and Security: A Game-Theoretic View with K. J. Ray Liu (Cambridge, 2010).

'Authored by respected pioneers of this field, this book offers a generalised framework by combining physics, signal processing and machine learning to tackle many real-world applications of importance, with low complexity for practical implementation. It reveals the prospect that ambient radio can serve as a new sixth sense to help decipher the world. Written with mathematical rigour and engineering insight, this book is an excellent reference for both researchers in academia and practitioners in industry.' Wen Yonggang, Nanyang Technological University, Singapore

• 1. Principles of time reversal and effective bandwidth; Part I. Indoor Locationing and Tracking: 2. Centimeter-accuracy indoor positioning; 3. Multi-antenna approach; 4. Frequency hopping approach; 5. Decimeter-accuracy indoor tracking; Part II. Wireless Sensing and Analytics: 6. Wireless events detection; 7. Statistical learning for indoor monitoring; 8. Radio biometrics for human recognition; 9. Vital signs estimation and detection; 10. Wireless motion detection; 11. Device-free Speed estimation; Part III. Wireless Power Transfer and Energy Efficiency: 12. Time-reversal for energy efficiency; 13. Power waveforming; 14. Joint power waveforming and beamforming; Part IV. 5G Communications and Beyond: 15. Time-reversal division multiple access; 16. Combating strong-weak resonances in TRDMA; 17. Time-reversal massive multipath effect; 18. Waveforming; 19. Spatial focusing effect for networking; 20. Tunnelling effect for cloud radio access network; Part V. IoT Connections: 21. Time-reversal for IoT; 22. Heterogeneous connections for IoT.

K. J. Ray Liu is Christine Kim Eminent Professor of Information Technology in the Department of Electrical and Computer Engineering at the University of Maryland, College Park. A Highly Cited Researcher, he is a Fellow of the Institute of Electrical and Electronics Engineers (IEEE) and the American Association for the Advancement of Science (AAAS), IEEE Vice President, Technical Activities, and a former President of the IEEE Signal Processing Society. He is a recipient of the 2016 IEEE Leon K. Kirchmayer Award, the IEEE Signal Processing Society 2014 Society Award, and the IEEE Signal Processing Society 2009 Technical Achievement Award. He has also co-authored several books, including Cooperative Communications and Networking (Cambridge, 2008). Beibei Wang is Chief Scientist in Wireless at Origin Wireless, Inc., and is also affiliated with the University of Maryland. She has been a recipient of the Outstanding Graduate School Fellowship, the Future Faculty Fellowship, the Dean's Doctoral Research Award from the University of Maryland, and the Overview Paper Award from the IEEE Signal Processing Society in 2015. She has co-authored Cognitive Radio Networking and Security: A Game-Theoretic View with K. J. Ray Liu (Cambridge, 2010).

'Authored by respected pioneers of this field, this book offers a generalised framework by combining physics, signal processing and machine learning to tackle many real-world applications of importance, with low complexity for practical implementation. It reveals the prospect that ambient radio can serve as a new sixth sense to help decipher the world. Written with mathematical rigour and engineering insight, this book is an excellent reference for both researchers in academia and practitioners in industry.' Wen Yonggang, Nanyang Technological University, Singapore

• 1. Principles of time reversal and effective bandwidth; Part I. Indoor Locationing and Tracking: 2. Centimeter-accuracy indoor positioning; 3. Multi-antenna approach; 4. Frequency hopping approach; 5. Decimeter-accuracy indoor tracking; Part II. Wireless Sensing and Analytics: 6. Wireless events detection; 7. Statistical learning for indoor monitoring; 8. Radio biometrics for human recognition; 9. Vital signs estimation and detection; 10. Wireless motion detection; 11. Device-free Speed estimation; Part III. Wireless Power Transfer and Energy Efficiency: 12. Time-reversal for energy efficiency; 13. Power waveforming; 14. Joint power waveforming and beamforming; Part IV. 5G Communications and Beyond: 15. Time-reversal division multiple access; 16. Combating strong-weak resonances in TRDMA; 17. Time-reversal massive multipath effect; 18. Waveforming; 19. Spatial focusing effect for networking; 20. Tunnelling effect for cloud radio access network; Part V. IoT Connections: 21. Time-reversal for IoT; 22. Heterogeneous connections for IoT.

K. J. Ray Liu is Christine Kim Eminent Professor of Information Technology in the Department of Electrical and Computer Engineering at the University of Maryland, College Park. A Highly Cited Researcher, he is a Fellow of the Institute of Electrical and Electronics Engineers (IEEE) and the American Association for the Advancement of Science (AAAS), IEEE Vice President, Technical Activities, and a former President of the IEEE Signal Processing Society. He is a recipient of the 2016 IEEE Leon K. Kirchmayer Award, the IEEE Signal Processing Society 2014 Society Award, and the IEEE Signal Processing Society 2009 Technical Achievement Award. He has also co-authored several books, including Cooperative Communications and Networking (Cambridge, 2008). Beibei Wang is Chief Scientist in Wireless at Origin Wireless, Inc., and is also affiliated with the University of Maryland. She has been a recipient of the Outstanding Graduate School Fellowship, the Future Faculty Fellowship, the Dean's Doctoral Research Award from the University of Maryland, and the Overview Paper Award from the IEEE Signal Processing Society in 2015. She has co-authored Cognitive Radio Networking and Security: A Game-Theoretic View with K. J. Ray Liu (Cambridge, 2010).

'Authored by respected pioneers of this field, this book offers a generalised framework by combining physics, signal processing and machine learning to tackle many real-world applications of importance, with low complexity for practical implementation. It reveals the prospect that ambient radio can serve as a new sixth sense to help decipher the world. Written with mathematical rigour and engineering insight, this book is an excellent reference for both researchers in academia and practitioners in industry.' Wen Yonggang, Nanyang Technological University, Singapore

• 1. Principles of time reversal and effective bandwidth; Part I. Indoor Locationing and Tracking: 2. Centimeter-accuracy indoor positioning; 3. Multi-antenna approach; 4. Frequency hopping approach; 5. Decimeter-accuracy indoor tracking; Part II. Wireless Sensing and Analytics: 6. Wireless events detection; 7. Statistical learning for indoor monitoring; 8. Radio biometrics for human recognition; 9. Vital signs estimation and detection; 10. Wireless motion detection; 11. Device-free Speed estimation; Part III. Wireless Power Transfer and Energy Efficiency: 12. Time-reversal for energy efficiency; 13. Power waveforming; 14. Joint power waveforming and beamforming; Part IV. 5G Communications and Beyond: 15. Time-reversal division multiple access; 16. Combating strong-weak resonances in TRDMA; 17. Time-reversal massive multipath effect; 18. Waveforming; 19. Spatial focusing effect for networking; 20. Tunnelling effect for cloud radio access network; Part V. IoT Connections: 21. Time-reversal for IoT; 22. Heterogeneous connections for IoT.