This correspondence investigates a reconfigurable intelligent surface (RIS)-assisted wireless communication system with security threats. The RIS is deployed to enhance the secrecy outage probability (SOP) of data sent legitimate user. By deriving distributions received signal-to-noise-ratios (SNRs) at user and eavesdropper, we formulate, in closed-form expression, tight bound for SOP under con...

This letter investigates secure transmission in an intelligent reflecting surface (IRS) assisted non-orthogonal multiple access (NOMA) network. Consider a practical eavesdropping scenario with imperfect channel state information of the eavesdropper, we propose robust beamforming scheme using artificial noise to guarantee NOMA IRS. A joint transmit and IRS phase shift optimization problem is for...