Secure multigroup multicast communication systems via intelligent reflecting surface

Physical Layer Security Techniques for Future Wireless Networks

“…Aiming to maximize the system sum SR, the beamforming vectors, AN covariance matrix at the BS and phase shift matrix at the IRS were jointly optimized by applying AO, SDR and manifold optimization. The authors in [64] investigated a secure IRS-aided multigroup multicast MISO communication system to minimize the transmit power subject to the SR constraints. First, an SDR-based AO algorithm was proposed and a high-quality solution was obtained.…”

Weighted Sum Secrecy Rate Maximization Using Intelligent Reflecting Surface

“…Although [32] and [37] have studied the joint BF and AN optimization in IRS-aided secure network, there exist several difference of our work with these two works:…”

“…In [36], the authors investigated the IRS-aided transmission without the knowledge of Eve's CSI, where a null space based AN method was proposed to minimize the transmit power. Recently, in [37], the authors studied the secure multi-group multi-cast network via IRS, where a SDP-DRAFT May 24, 2021 GR method was proposed to design the BF. Besides, to reduce the computational complexity, a second-order cone programming (SOCP)-based method was studied.…”

“…1) [32] assumed that the Eve are equipped with multiple antennas and the directly links are negligible, while we focus on single-antenna Eve scenario and both the direct link and the cascaded links are considered. Besides, [37] studied the secrecy multi-group multi-cast network, while we assume a multi-user multi-cast channel, e.g., there exits only one Bob in each group. Thus, the considered system model is different.…”

“…2) [32] proposed a penalty-based SDP method to maximize the achievable rate at the Bobs, while keeping the channel capacity of the Eve's link below a predefined threshold. Then, [37] proposed a SDP method and a SOCP method to minimize the transmit power under the secrecy rate constraint. On the other hand, we treat the WSSR as the objective and the May 24, 2021 DRAFT proposed method mainly based on ADMM and EBCD, and not involved with the penaltybased approximation method or the GR method.…”