Ergodic Secrecy Rate of RIS-Assisted Communication Systems in the Presence of Discrete Phase Shifts and Multiple Eavesdroppers

This letter investigates the ergodic secrecy rate (ESR) of a reconfigurable intelligent surface (RIS)-assisted communication system in presence multiple eavesdroppers (Eves), and by assuming discrete phase shifts at RIS. In particular, closed-form approximation ESR is derived for both non-colluding colluding Eves. The analytical results are shown to be accurate when number reflecting elements RIS N large. Asymptotic analysis provided investigate impact on ESR, it proved that scales with log 2 Numerical verify obtained scaling laws.