Sensing-Assisted Secure Communication via Reconfigurable Intelligent Surface

Abstract

In this letter, sensing-assisted secure communication scheme via reconfigurable intelligent surface (RIS) in integrated sensing and communication (ISAC) systems is proposed. A target parameter estimation method based on orthogonal frequency division multiplexing (OFDM) and time-domain reconstruction is developed to estimate the angles and distances of targets. Based on this, the beamforming vector of the base station (BS) and the phase shift matrix of RIS are elaborately designed to maximize the worst-case secrecy rate. Numerical results validate the effectiveness and superiority of the proposed scheme, and the secrecy rate is higher than that of benchmark schemes.