Group Members
Dr Wen Tong visited King's Building, the University of Edinburgh, UK 
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The group is headed by Prof. Tharmalingam Ratnarajah (A’96-M’05-SM’05), a Fred Harris Endowed Chair in Digital Signal Processing at San Diego State University (SDSU), California. His research interests include signal processing and information-theoretic aspects of beyond 5G and 6G wireless networks, in-band full-duplex (IBFD) radio, millimetre-wave (mmWave) communications, random matrices theory, interference alignment, massive multiple-input-multiple-output (MIMO) communications, quantum information theory, and statistical and array signal processing. Prof. Ratnarajah has an outstanding international track record and reputation for his research, as recognized by over 480 peer-reviewed papers and four US patents. He is recognized (with over 10000 citations and an H-index of 51) for his work on the theory and development of advanced MIMO wireless communications at both the link and system levels. He also has a proven track record in project/technical management, including the project coordination of the European Union projects HARP (4.6M€) in the area of highly distributed MIMO and ADEL (3.7M€) in the field of licensed shared access. Previously, he was the coordinator of the Future and Emerging Technologies project CROWN (3.4M€) in the area of cognitive radio networks and HIATUS (3.6M€) in the area of interference alignment. Prof. Ratnarajah is a Fellow of the Higher Education Academy and a senior member of IEEE. He has supervised 22 PhD students and 25 post-doctoral research fellows and raised $12.0+ million (USD) of research funding. Prof. Ratnarajah also has a proven track record of working on defense-related projects with leading UK defence industries, for example, signal detection in spatially correlated noise environments with Roke Manor Research Ltd, an EU project on cognitive radio with QinitiQ, and two Defence Science and Technology Laboratory (DSTL) projects: (i) Development of a ‘super-resolution’ bi-static radar concept for the detection, localization and recognition of concealed knives and (ii) Waveform Interference: A study on adjacent waveform interference to RF communications; EPSRC/Leonardo PhD studentship on Joint Radar and Communications (RADCOM) Waveforms for Airborne Radars. His recent projects are 1) Through-the-wall detection and localization of life signs, and 2) Distributed coherent processing moving target indicator.

​Dr Ratnarajah was born and educated at the secondary school level in Sri Lanka. He left Sri Lanka in 1989 to pursue higher education (BEng (Hons), MSc, and PhD) and has worked in various places in the United Kingdom and Canada. He has been a naturalized citizen of Canada since 2000, a naturalized citizen of the United Kingdom since 2010, and a permanent resident of the United States of America since 2025.

Current Research Fellows and PhD Students under Prof. Ratnarajah
  1. Dr S. Nassirpour
  2. Dr S. S. Hassan
  3. Alfredo Gonzalez
Recent Graduates 
  1. Sam Lavery
  2. Z. Liu
  3. Mr. Y. Mu
  4. Dr H. Luo
  5. Dr T. Zhang
  6. Dr Paula Aquilina
  7. Dr H. He
  8. Dr O. KolawoleYetunde
Collaborators
  1. Dr Navneet Garg
  2. Dr Sudip Biswas
  3. Prof. Mathini Sellathurai
  4. Prof. Christos Masourus
  5. Prof. Zhiquo Ding
  6. Prof. Vimal Bhatia
​
Past PhD Theses Supervised by Prof. Ratnarajah
  1. Advanced Interference Management Techniques for Future Generation Cellular Networks, April 2017
  2. Energy Efficient Transmitter Design with Compact Antenna for Future Wireless Communication Systems, 2017
  3. Future Cellular Systems: Fundamentals and the Role of Large Antenna Array, Dec. 2016
  4. Enhancing Physical Layer Security in Wireless Networks with Cooperative Approaches, April 2016
  5. Interference Management Techniques in Large-Scale Wireless Networks, Sep. 2014.
  6. Advanced Interference Management Techniques for Future Wireless Networks, April 2014.
  7. On the Eigenvalue-Based Spectrum Sensing Techniques in Cognitive Radio Wireless Networks, April 2012.
  8. Spectrum Sharing in Cognitive Radio Wireless Networks, Feb. 2012.
  9. Information Theoretic Reliability Functions For Multiple Antenna Wireless Communication Systems, Sep. 2012.
  10. Information-Theoretic Security in Wireless Communication Systems, Feb. 2012.
  11. Interference Alignment in Cognitive Radio, Relay Channels, and Cellular Networks, November 2012.

​Past Research Fellows under Prof. Ratnarajah
  1. Dr Sudip Biswas (currently at IIIT Guwahati)
  2. Dr S. Vuppala (currently at University of Luxembourg)
  3. Dr A. Papazafeiropoulos (currently at Imperial College London)
  4. Dr Ali Cagatay CIRIK (currently at Sierra Wireless & University of British Columbia, Canada)
  5. Dr Miltiades Filippou (currently at Intel Mobile Communications, Munich, Germany)
  6. Dr Christos Masouros (currently at UCL, UK)
  7. Dr E. H. G. Yousif (currently at the University of Edinburgh, UK)
  8. Dr H. Du (currently at Jinan University, China)
  9. Dr A. Kortun (currently at Queen's University Belfast, UK)
  10. Dr D. Wilcox (currently at Camlin Technologies, UK)
  11. Dr C. (Tom) Zhong (currently at Zhejiang University, China)
  12. Dr M. Ding (currently at HKUST, Hong Kong)
  13. Dr L. G. Barbero (currently at Aviation Controller, UK)
  14. Dr S. Ahmed (currently at KAUST, Saudi Arabia)
  15. Dr Zhiguo Ding (currently at Newcastle University, UK)
  16. Dr Fahd A Khan (currently at National University of Science and Technology, Pakistan)
  17. Dr M. Z. I. Sarkar (currently at RUET, Bangladesh)
  18. Dr Faheem Khan (currently at the University of Huddersfield, UK)
  19. Dr J. Xue (currently at Xi'an Jiaotong University, China)
  20. Dr Keshav Singh (UCD, Dublin)
  21. Dr Navneet Garg (NIT, Delhi, India)
  22. Dr Pratiti Paul (Virginia Tech, USA)
  23. Dr Abhijeet Bishnu (Microchip Technology Inc., UK)
  24. Y. Yuepei (currently at Imperial College London)
  25. X. Liu (currently at University of Aberdeen, UK)