Outage Constraint Robust Cooperative Beamforming and Jamming Design for Secure AF Relay Networks

Abstract

This paper investigates a joint robust scheme in a secrecy relay network where distributed relays perform cooperative beamforming and a friendly jammer transmits jamming signal to enhance the information security. Specifically, we consider the outage constraint secrecy rate maximization design with imperfect channel state information. Through semidefinite relaxation and one-dimensional search, we propose a two-layer optimization method to solve the nonconvex problem. In addition, the Bernstein-type inequality and large deviation inequality are utilized to convert the probabilistic constraint. Simulation results demonstrate the performance of the proposed design.

Cooperative Transmission Design for Secure Network assisted by Active RIS

“…By controlling these elements, the reflected signals can be adjusted to the desired direction to change the propagation environment [2]. Since it only reflects the received signal, the hardware cost and power consumption for RIS are much lower than the traditional active transmitter or relay [3]. With these advantages, the RIS has sparked great research interests.…”

“…Then, we show that the worst-case robust design can be handled in a similar manner as the previously proposed method in the case of perfect CSI. In fact, the proposed worst-case robust design method can also be used in other robust design such as the outage-constrained robust design by using the proposed SDP-based search method with the Bernstein-type inequality or the large deviation inequality [3]. 3) Simulation results demonstrate the performance gains of the proposed designs as well as the superiority of active RIS, which not only effectively relieve the "double fading" effect of the reflecting link, and also boost the secure performance when compared with the existing solutions for passive RIS and no RIS design.…”