Robust Beamforming and Artificial Noise Design in K-User Interference Channel with Simultaneous Wireless Information and Power Transfer

—In this paper, we investigate the robust beamforming and artificial noise design for simultaneous wireless information and power transfer in K-user interference channel, where a secure user is wiretapped by an energy receiver (external eavesdropper). With only imperfect Eavesdropper's Channel State Information (ECSI) at the transmitters, we aim to maximize the worst-case secrecy rate of the secure user, while guaranteeing the individual power constraint at each transmitter, the quality of service requirements at the wiretap-free nodes and the energy harvesting requirement at the energy receiver. Adopting the ellipsoidal uncertainty model of imperfect ECSI, our design goal is reformulated as a two-stage optimization problem, which can be solved efficiently with the help of rank relaxation and one-dimensional line search. Simulation results verify the effectiveness of the proposed design in different scenarios.