Abstract
This paper proposes a novel approach for enhancing physical layer
security (PLS) in wireless networks by utilizing a combination of
reconfigurable intelligent surfaces (RIS) and artificial noise (AN). The
proposed aerial RIS (A-RIS) concept utilizes a RIS-attached unmanned
aerial vehicle (UAV) that hovers over the network area to improve the
signal quality for legitimate users and jam that of illegitimate ones.
We propose a method of virtually partitioning the RIS, such that the
partition phase shifts are configured to improve the intended signal at
a legitimate user while simultaneously increasing the impact of AN on
illegitimate users. Additionally, thanks to the availability of
closed-form optimal RIS portions, the proposed deployment approaches
converge in less than a second, making it suitable for dynamic A-RIS
deployment.