Design of Self-energy Recycling for Full Duplex MISO-SWIPT Secure Communication System

This paper studies the energy harvesting(EH) and physical layer security problems of a full duplex simultaneous wireless information and power transfer communication network with multiple eavesdropping nodes were studied, and proposes a secure beamforming design scheme aided by artificial noise. This scheme considers communication security constraints, user uplink rate constraints, and minimum EH threshold constraints, and establishes a transmission power minimization model based on self-energy recycling mechanism. By optimizing the artificial noise covariance, uplink and downlink beamforming vectors, and power allocation factors, it utilizes energy access points to further supplement user's energy, optimizing the total transmission power of the system. As the original optimization problem is non convex, we use the two-stage optimization approach to transform the problem into two sub-problems, and utilize the semi definite relaxation technique and particle swarm optimization algorithm to solve they respectively. Simulation results show that the proposed scheme can effectively reduce the transmission power of the system while ensuring basic downlink secure transmission and meet user EH and uplink transmission requirements.