Abstract
Intelligent surfaces have recently been presented as a revolutionary technique and recognized as one of the candidates for beyond fifth-generation wireless networks. This paper investigates the physical layer security of a large intelligent surface (LIS) aided wireless system over Nakagami-rn channels. We propose a phase- based adaptive modulation scheme, where LIS's phase-shift optimization process is effectively utilized to enhance the system's security. Moreover, the effect of the Nakagami- rn fading parameter (rn), correlation parameter (p), and a number of passive LIS elements (M) on the system performance are examined. The significant improvement in confidentiality is shown while evaluating the bit error rate performance of the proposed scheme.