QoS-based beamforming with cooperative jamming in Cognitive Radio Networks

This paper studies on the issue of physical layer security of Cognitive Radio Network (CRN) with cooperative jamming from the Quality of Service (QoS) perspective. The problem is formulated as to maximize the signal-to-noise (SNR) at the second user´s receiver under the interference limit at the primal user through beamforming of the relays. Through some appropriate processing, the optimization objective can be reached using a combination of convex optimization and an iterative search. Simulation results verify the effectiveness of the proposed approach.