Enhanced Secure Wireless Information and Power Transfer via Intelligent Reflecting Surface

In this letter, an intelligent reflecting surface (IRS)-aided secure wireless information and power transfer system is studied. To maximize the harvested of energy harvesting receiver (EHR), we optimize transmit beamforming at access point (AP) phase shifts IRS subject to secrecy rate (SR) constraints. Due non-convexity optimization problem coupled variables, convert into a semidefinite relaxation (SDR) sub-optimal solution obtained. reduce high-complexity proposed SDR method, low-complexity alternating (LC-AO) algorithm proposed. Simulation results show that LC-AO methods approximately double existing method without with same SR. particular, achieves almost performance as but much lower complexity.