Slide 1

Professor K. J. Ray Liu

Distinguished University Professor

& Distinguished Scholar-Teacher

University of Maryland

Christine Kim Eminent Professor of Information Technology

A. James Clark School of Engineering

2232 Kim Building
Email: kjrliu [ at ] umd [ dot ] edu
Tel: 301-405-6619

Post Address:
Electrical and Computer Engineering Department
A.V. William Building
University of Maryland
College Park, MD 20742


Dr. Liu received the B.S. degree from the National Taiwan University in 1983, and the Ph.D. degree from UCLA in 1990, both in electrical engineering. He is a Distinguished University Professor and a Distinguished Scholar-Teacher of the University of Maryland, where he is Christine Kim Eminent Professor of Information Technology of A. James Clark School of Engineering.
Dr. Liu leads the Maryland Signals and Information Group (SIG) with research contributions that encompass broad aspects of signal processing and communications, including wireless communications; network science; multimedia signal processing; information forensics and security; bioinformatics; and signal processing algorithms and architectures, in which he has published over 10 books and 800 refereed papers. His recent focus is on the development of wireless AI for wireless sensing and tracking using ambient radio signals from WiFi, LTE, and 5G networks.
Over the years, he has trained over 67 Ph.D. and postdoctoral students, of which ten of them are now IEEE fellows, and most of whom are active members of major universities and industrial institutions worldwide.
Dr. Liu has served as the IEEE Vice President, Technical Activities (2019) overseeing about 50+ societies/councils/communities, Division IX Director of IEEE Board of Directors (2016-17), and the President of IEEE Signal Processing Society (2012-13), in which he has also served as Vice President - Publications (2006-08) and a member on the Board of Governor. He was the Editor-in-Chief of IEEE Signal Processing Magazine (2003-05) and the founding Editor-in-Chief of EURASIP Journal on Advances in Signal Processing (JASP). Dr. Liu was a founder of Asia-Pacific Association of Signal and Information Processing (APSIPA). He has served as Director of Graduate Studies and Research, and Associate Chair of Electrical and Computer Engineering Department.
Dr. Liu is the recipient of numerous honors and awards including,
  • CES 2020 Innovation Award for the Linksys Aware product enabled by wireless AI;
  • 2019 Fellow of National Academy of Inventors for his inventions of wireless AI;
  • 2017 CEATEC Grand Prix award for his invention Time-Reversal Machine, the platform for wireless AI;
  • 2016 IEEE Leon K. Kirchmayer Technical Filed Award on Graduate Teaching and Mentoring for “exemplary teaching and curriculum development, inspirational mentoring of graduate students, and broad educational impact in signal processing and communications.”;
  • IEEE Signal Processing Society 2014 Society Award for “influential technical contributions and profound leadership impact”;
  • IEEE Signal Processing Society 2009 Technical Achievement Award for "for pioneering and outstanding contributions for the advances of signal processing in multimedia forensics, security, and wireless communications";
  • APSIPA 2018 Grand Award for “founding the APSIPA, and pioneering contributions for the advances of signal processing in multimedia forensics, security, and wireless communications";
  • 1994 National Science Foundation Young Investigator Award;
  • over a dozen of best paper awards;
  • IEEE Signal Processing Society Distinguished Lecturer;
  • IEEE Signal Processing Society Meritorious Service Award, and
  • EURASIP Meritorious Service Award.
Recognized by Web of Science as a Highly Cited Researcher since 2010, Dr. Liu is a Fellow of the IEEE, AAAS, and National Academy of Inventors. He is a member of Sigma Xi, the Scientific Research Honor Society. His research was featured as one of seven technologies that IEEE believes will have the world changing implications on the way humans interact with machines, the world and each other, in honor of IEEE's 125th Anniversary.
Recently Dr. Liu was the founder of Origin Wireless that invented the world’s first centimeter-accuracy indoor positioning/tracking system using the fundamental principle of time reversal. Indoor positioning/tracking has been a key technical problem unresolved for over three decades until his discovery that solved this long standing, conundrum to achieve a 1-2 centimeter location accuracy, even under non-line-of-sight conditions, with only a single WiFi device operating at 5GHz. With such an accuracy, he further proposed the concept of radio biometrics and developed the world’s first human recognition using radio waves through the wall. His team developed a wireless AI platform for a wide range of device-free applications, including vital signs detection, events recognition, fall detection, wireless charging, and indoor navigation. The debut of his invention, the Time-Reversal Machine, won the 2017 CEATEC Grand Prix award. The wireless AI enabled Linksys Aware won the CES 2020 Innovation Award and was available over 150 countries worldwide; it was also picked by Newsweek as “Best of CES” and GIZMODO as “The Very Best Gadgets We Saw at CES 2020”. Dr. Liu was also the founder of Odyssey Technologies in 1997 pioneering the world’s first digital surveillance system over Internet.
He also received various research and teaching recognitions from the University of Maryland, including Poole and Kent Senior Faculty Teaching Award (2005), Outstanding Faculty Research Award (2008), and Outstanding Service Award (2012), (each with one award per year from the entire college), all from A. James Clark School of Engineering; Invention of the Year Award (for three times) from University’s Office of Technology Commercialization, as well as the George Corcoran Award for outstanding contributions to electrical engineering education from Electrical and Computer Engineering Department, and the Outstanding Systems Engineering Faculty Award in recognition of outstanding contributions in interdisciplinary research from Institute for Systems Research.
Dr. Liu was the prime architect and proposer of IEEE Trans. on Information Forensics and Security, IEEE Journal on Selected Topics of Signal Processing, and IEEE Trans. on Multimedia. He also initiated the creation of IEEE Trans. on Computational Imaging and IEEE Trans. on Signal and Information Processing over Networks. As Vice President – Publications, he started the Inside Signal Processing eNewsletter for IEEE Signal Processing Society. He has served as the General Chair of 2007 IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP), Hawaii; a Co-General Chair of the First APSIPA Annual Summit and Conference (ASC) in Sapporo, 2009; the Chair of Multimedia Signal Processing Technical Committee; Technical Program Chair of 2003 IEEE International Conference on Multimedia and Expo.
He has delivered keynotes/plenaries in various international conferences and workshops and distinguished lectures in many universities/institutes worldwide. He has been consultants to industry and also has served occasionally as expert consultant/witness for legal proceedings. In addition, Dr. Liu also served in the review panels of centers of excellence from various nations and agencies such as National Science Foundation and European Research Council, and many countries. He was a member of IEEE Fellow Committee.
In his capacity as President and President-Elect of IEEE Signal Processing Society, Dr. Liu chaired a committee to conduct a major revision of SPS Bylaws; articulated the establishment of new membership board to offer more values and benefits to members; proposed the Chapter of the Year Award; developed Seasonal Schools; embarked a new online tutorials/educational program called SigView; created a “Signal Processing Cup” to engage students into competitions; started a new flagship conference called GlobalSIP to address newly emerging topics; developed ChinaSIP initiative as an outreach to China; championed a new initiative to provide technical repository services called SigPort; established Special Interest Groups to address new emerging topics; permanently established student travel fund into the operating budget; and launched a visibility effort to gain more prominence for signal processing work.
Dr. Liu has been on the editorial board of IEEE Transactions on Signal Processing, IEEE Journal of Selected Topics in Signal Processing and IEEE Signal Processing Magazine. He has also been a Guest Editor of special issues on Multimedia Signal Processing of Proceedings of the IEEE, special issue on Signal Processing for Wireless Communications of IEEE Journal of Selected Areas in Communications, special issue on Multimedia Communications over Networks of IEEE Signal Processing Magazine, special issue on Multimedia over IP of IEEE Trans. on Multimedia, special issue on cooperative communications and networking of IEEE Journal of Selected Areas in Communications, special issue on signal and information processing for social networks of IEEE Journal of Selected Topics on Signal Processing, and special issue on Signal and Information Processing for Social Learning and Networking of IEEE Signal Processing Magazine.
Dr. Liu is a co-author of “Wireless AI: Wireless Sensing, Positioning, IoT, and Communications”, Cambridge University Press, 2019; “Behavior Dynamics in Media-Sharing Social Networks”, Cambridge University Press, 2011; “Cognitive Radio Networking and Security – A Game Theoretic View”, Cambridge University Press, 2010; “Cooperative Communications and Networking”, Cambridge University Press, 2009; “Resource Allocation for Wireless Networks: Basics, Techniques, and Applications”, Cambridge University Press, 2008; “Ultra-Wideband Communication Systems: The Multiband OFDM Approach”, Wiley, 2007; “Network-Aware Security for Group Communications”, Springer, 2007; “Multimedia Fingerprinting Forensics for Traitor Tracing”, EURASIP Book Series on Signal Processing and Communication (Hindawi), 2005; “Design of Digital Video Coding Systems: A Complete Compressed Domain Approach”, Marcel Dekker, 2001; and a co-editor of “Handbook on Array Processing and Sensor Networks”, IEEE-Wiley, 2009 and “High Performance VLSI Signal Processing: Volume I: System Design and Methodology; Vol. II: Algorithms, Architectures, and Applications”, IEEE Press, 1998.