RIS-Aided Physical Layer Security for Visible Light Communication Systems

To improve the security performance of Visible Light Communications (VLC) systems, this paper explores a novel secure scheme that incorporates reconfigurable intelligent surfaces (RIS) and jamming technologies. Specifically, the system includes a transmitter, a legitimate user who can control the jamming, and an eavesdropper. In addition, a mirror array-based RIS (mRIS) is arranged on the wall of the room. Adjusting the configuration of the mRIS units enables the reshaping of the channel environment, thereby improving the system's secrecy rate. Then, a secrecy rate maximization problem is formulated. To address the proposed optimization problem, a genetic algorithm-based (GA)-based optimization algorithm is put forward. Simulation results demonstrate that the proposed VLC security system, combined with the optimization algorithm, can effectively enhance the system's security performance.