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His research interests are in the areas of wireless communications, coding and information theory. He pioneered the lattice approach to signal detection problems (such as sphere decoding and complex lattice reduction-aided detection) and unified all known constructions of perfect (or CAZAC) root-of-unity sequences (widely used as preambles and radar signals). Since Jun 2002, he has been the principal investigator of over 16 funded research projects. Citations of his research contributions can be found in several prominent publications, including Encyclopaedia of Mathematics, Springer, http://eom.springer.de/C/c110430.htm; Handbook of Coding Theory, Elsevier Press, 1998, Chapter 21; The Mobile Communications Handbook, IEEE/CRC Press, 2nd Edition, 1999, Section 8.5; The Communications Handbook, IEEE/CRC Press, 2nd Edition, 2002, Section 8.5. He has published 1 book, and co-authored 30+ filed patent applications and 200+ technical publications, among which he is the sole author of over 40. His joint work received the 2014 HK-Taiwan IoT Academia Best Research Award, the 2014 Hong Kong U-21 IoT Gold Award for IoT Revolutional Concept, the ACM MobiCom2013 Best Mobile App Award, the APCC2013 Best Paper Award, and the ISITA2002 Paper Award for Young Researchers. In addition, his supervised postgraduate students won the First Prize of the 2015 IEEE Region 10 (Asia-Pacific) Postgraduate Student Paper Contest, the First Prize of the 2015 Inno-China Entrepreneurship Competition, the HKSTPC Technopreneur Gold Award of the 2014 YDC E-Challenge Competition, and the First prize of the 2008 & 2014 HK IEEE Section Postgraduate Student Paper Contest, and his supervised undergraduate students won the first-runner up prizes of the 2002 & 2003 IEE HK YMS Project Competitions. A novel picture-embedding 2D barcode, PiCode, developed by the HKUST Barcode Group under his leadership was highlighted as one of the four local innovations in the 2015 International IT Fest, a flagship event organized by the Office of Government Information Officer, Hong Kong.