9 December 2020
Nemanja Stefan Perović,
Marco Di Renzo,
Mark F. Flanagan
Proposes using reconfigurable intelligent surfaces (RIS) to shape radio waves for better wireless comms
Investigates optimizing RIS phase shifts and transmitter precoding to maximize channel cutoff rate
Develops two optimization methods that significantly improve data rates
Shows RIS is a promising technology for controlling propagation and boosting performance
Reconfigurable Surfaces Usher in a New Era of Wireless Communications
This paper proposes using reconfigurable intelligent surfaces (RIS) to shape radio wave propagation for improved wireless communications. An RIS consists of many low-cost, passive elements that can modify signal reflections through adjustable phase shifts. By intelligently tuning an RIS, radio waves can be controlled to enhance performance metrics like data rate. The authors investigate optimizing RIS phase shifts and transmitter precoding to maximize channel cutoff rate, a tractable metric aligned with mutual information. Two optimization methods are developed and shown to significantly boost data rates. Overall, the paper shows RIS is a promising technology for future wireless systems.
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