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CSI acquisition in RIS-assisted mobile communication systems

Yu Han¹, Wankai Tang¹, Xiao Li¹

¹National Mobile Communications Research Laboratory, Southeast University, Nanjing 210096, China.

National Science Review

|July 17, 2023

Abstract:

Reconfigurable intelligent surface- (RIS) assisted mobile communication is a promising technological paradigm thanks to the attractive advantages of low cost and flexible control of electromagnetic waves. However, the low-cost features of RISs entail some fundamental challenges to the acquisition of channel state information (CSI), which is essential for the optimal RIS design. To tackle this problem, there have been extensive studies on CSI acquisition in RIS-assisted mobile communication systems, from the perspective of architectural improvement as well as specific mathematical solutions. This article aims to overview the existing works on CSI acquisition in RIS-assisted mobile communication systems.

Keywords:

RIS channel estimation hybrid RIS implicit CSI

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