劉國瑞教授出生於中國臺灣地區，1983年畢業於臺灣大學，1990年在美國加州大學洛杉磯分校獲得電子工程博士學位。
他在信號處理與通信技術領域做出傑出貢獻，出版高性能大規模信號處理、數字視頻編碼系統、超寬帶通信、陣列信號處理與傳感器網絡、認知無線電組網與安全等專著10本。發表論文600餘篇，H因子51，在信號處理、通信、信息取證學等領域做出傑出貢獻，他領導的信號處理研究在2009年IEEE 125周年被選為對人類將有重大影響的7大信息技術之一。
他擔任IEEE信號處理學會主席(2012-2013，當選主席2010-2011，副主席2006-2008)，是亞太信號與信息處理協會創始人之一，IEEE Signal Processing Magazine主編(2003-2005)(IEEE Signal Processing Magazine在Ray Liu教授領導下成為electrical and electronic方面的影響因子最高的期刊)。他是美國科學促進會AAAS會士和IEEE會士，歐盟歐洲研究委員會、芬蘭科學院科學與工程技術評審組、澳大利亞國家科學與工程研究評審組成員和香港科技大學戰略發展顧問委員會成員、西北工業大學顧問教授。
劉教授已經培養了40多名來自中國的博士和博士後，他們中的許多人已經在世界各地的大學任教，包括清華大學、中國科學技術大學、西安交通大學和北京郵電大學。
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 indoor tracking using ambient radio signals.
Over the years, he has trained over 68 Ph.D. and postdoctoral students, of which ten are now IEEE fellows, and most of whom are active members of major universities and industrial institutions worldwide.
Dr. Liu is 2021 IEEE President-Elect, and will serve as 2022 IEEE President and CEO. He has served as the IEEE Vice President, Technical Activities (2019) overseeing about 50+ societies, 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 two IEEE Technical Field Awards: the 2021 IEEE Fourier Award for Signal Processing with the citation 「For outstanding leadership in and pioneering contributions to signal processing for wireless sensing and communications」, and the 2016 IEEE Leon K. Kirchmayer Graduate Teaching Award "for exemplary teaching and curriculum development, inspirational mentoring of graduate students, and broad educational impact in signal processing and communications".
He is also the recipient of numerous honors and awards including, IEEE Signal Processing Society 2014 Society Award for 「influential technical contributions and profound leadership impact" (the highest award bestowed by SPS, now called Norbert Wiener Society Award); IEEE Signal Processing Society 2009 Technical Achievement Award (now called Claude Shannon-Harry Nyquist Technical Achievement Award); APSIPA 2018 Grand Award; 1994 National Science Foundation Young Investigator Award; IEEE Signal Processing Society Distinguished Lecturer; over a dozen of best paper/invention awards; IEEE Signal Processing Society Meritorious Service Award, and EURASIP Meritorious Service Award.
Recognized by Web of Science as a Highly Cited Researcher (2001-2010, 2016-17), Dr. Liu is a fellow of the IEEE (2003), AAAS (2008), and National Academy of Inventors (2019). 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.
Dr. Liu is the founder and President of Origin Wireless, Inc., that pioneers wireless AI for wireless sensing and indoor positioning with over 100 patents filed or granted. His inventions won the prestigious 2017 CEATEC Grand Prix award and the CES 2020 Innovation Award, with products now available over 150 countries worldwide.
His team at Origin Wireless 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. His team discovered that due to a large number of multipaths, the time-reversal focusing effect exhibits an energy distribution whose stationary behavior can be harnessed to accurately estimate speed under severe indoor multipaths, a groundbreaking discovery that broke the impasse of 170+ years of search for such a solution since the Doppler Effect.
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 selected by Newsweek as 「Best of CES」 and by 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.
As a leader in IEEE, Dr. Liu proposed and created the IEEE DataPort to offer data repository services as a new benefit and value proposition for our members. It supports open science and reproducible research by hosting data that are citable and useful for our community. He also proposed and co-led the development of the IEEE app as 「Your Global Gateway to IEEE」 to discover IEEE and its quality assets. The app can be personalized allowing one to see, read, and choose how one wants to engage and connect all things in IEEE, as well as network globally.
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.