Joint beamforming for secure communication in RIS-assisted cognitive radio networks

This paper studies the security and communication efficiency problem of a reconfigurable intelligent surface (RIS) assisted cognitive radio network, in which we proposed scheme where secrecy rate (SR) transmission are jointly considered. In specific, with help RIS, exploit green interference caused by secondary network to ensure physical layer primary network. By taking mutual between these two networks into account, establish minimize total transmit power subject quality-of-service requirement user (SU), SR users (PUs) limited temperature PUs. our iterative algorithm, reflect beamforming alternatively optimized transforming PUs' constraint second order cone (SOC) form, optimal achieved based on penalty function. Simulation results show superiority algorithm terms compared other benchmarks, is not very susceptible number eavesdroppers PUs, conducive serving multiple wireless system.