Reconfigurable Intelligent Surfaces 2.0: Beyond Diagonal Phase Shift Matrices


Reconfigurable Intelligent Surfaces 2.0: Beyond Diagonal Phase Shift Matrices

Friday, 21 April, 14:00

It is our pleasure to invite you to the 6GEM Seminar Talk of Prof. Bruno Clerckx, Imperial College London


Reconfigurable intelligent surface (RIS) has gained much traction due to its potential to manipulate the propagation environment via nearly-passive reconfigurable elements. Attention has been drawn to the use of RIS 1.0 architectures based on diagonal phase shift matrices where each element of the RIS is connected to a load disconnected from the other elements. This enables simple RIS architectures to control the phase of the impinging wave and reflect the wave in the desired direction. This lecture argues that to truly exploit the benefits of RIS in 6G, RIS need to explore architectures beyond conventional diagonal phase shift matrices.  This lecture bridges microwave theory and RIS communications, introduces the audience to Beyond Diagonal (BD) RIS, and show the benefits of BD RIS architectures in terms of controlling both phases and magnitudes of reflected waves (hence, high flexibility in wave manipulation), enabling simultaneous transmission and reflection, increasing reflected power, boosting sum-rate and flexibility in various deployments, enabling highly directional full-space wireless coverage, etc.


Bruno Clerckx is a Professor, the Head of the Wireless Communications and Signal Processing Lab, and the Deputy Head of the Communications and Signal Processing Group, within the Electrical and Electronic Engineering Department, Imperial College London, London, U.K. He is also the Chief Technology Officer (CTO) of Silicon Austria Labs (SAL) where he is responsible for all research areas of Austria's top research center for electronic based systems. He received the MSc and Ph.D. degrees in Electrical Engineering from Université Catholique de Louvain, Belgium, and the Doctor of Science (DSc) degree from Imperial College London, UK. 
He has authored two books on “MIMO Wireless Communications” and “MIMO Wireless Networks”, 250 peer-reviewed international research papers, and 150 standards contributions, and is the inventor of 80 issued or pending patents among which 15 have been adopted in the specifications of 4G standards and are used by billions of devices worldwide. His research spans the general area of wireless communications and signal processing for wireless networks. He served as an editor or guest editor for the IEEE TRANSACTIONS ON COMMUNICATIONS, the IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS, and the IEEE TRANSACTIONS ON SIGNAL PROCESSING, EURASIP Journal on Wireless Communications and Networking, IEEE ACCESS, the IEEE JOURNAL ON SELECTED AREAS IN COMMUNICATIONS, the IEEE JOURNAL OF SELECTED TOPICS IN SIGNAL PROCESSING, the PROCEEDINGS OF THE IEEE, and the IEEE Open Journal of the Communications Society. He was an Editor for the 3GPP LTE-Advanced Standard Technical Report on CoMP. 
He received the prestigious Blondel Medal 2021 from France for exceptional work contributing to the progress of Science and Electrical and Electronic Industries, the 2021 Adolphe Wetrems Prize in mathematical and physical sciences from Royal Academy of Belgium, multiple awards from Samsung, IEEE best student paper award, and the EURASIP (European Association for Signal Processing) best paper award 2022. He is a Fellow of the IEEE and the IET, and an IEEE Communications Society Distinguished Lecturer.