Prof. Emil Björnson
KTH Royal Institute of Technology, Sweden
4th April 2023, 4:00pm - 5:00pm (GST)
How to Use Reconfigurable Intelligent Surfaces in Practical Scenarios?
There are many ways in which a reconfigurable intelligent surface (RIS) can improve the communication channel between a transmitter and a receiver. The larger the surface is, the higher the potential communication performance gains. The gains come from adapting the RIS configuration to the channels from the transmitter and to the receiver, which must be estimated in practice. The estimation challenge grows with the number of RIS elements, both in terms of computational complexity and signal resources that must be dedicated to pilot signaling. The problem is much different from conventional multi-antenna communications since the RIS is essentially blind, so its configurations must be designed elsewhere. The relative cost of channel estimation is particularly large in practical scenarios with user mobility and/or transmission of short data packets.
Emil Björnson is a Professor of Wireless Communication at the KTH Royal Institute of Technology, Stockholm, Sweden. He is an IEEE Fellow, Digital Futures Fellow, and Wallenberg Academy Fellow. He has a podcast and YouTube channel called Wireless Future. His research focuses on multi-antenna communications and radio resource management, using methods from communication theory, signal processing, and machine learning. He has authored three textbooks and has published a large amount of simulation code.