Reconfigurable Intelligent Surface (RIS) is a promising technology that is shaping the future communication networks. As the direct line of sight (LoS) is blocked from the Access point (AP) to the User Equipment (UE), RISs can help with improving the connection. However, RISs are also prone to failure like any other electrical device. There are cases that the small antenna elements on RISs fail to reflect the signals in the desired direction, and this causes a substantial degradation in the overall performance of the network. The challenge is to make sure to maintain a high Quality of Service (QoS) even when the RIS has faulty antenna elements.

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Required knowledge: Wireless communication, Convex optimization, Algebra

More details can be found in the link below:

https://ieeexplore.ieee.org/abstract/document/10437177