Integrating Energy Harvesting, Anti-Eavesdropping, and Communication in a Hybrid Beamforming System

Abstract

This paper proposes a scheme to integrate data communication, wireless energy harvesting and anti-eavesdropping functions into a hybrid beamforming downlink system to satisfy the demand for expanded functionalities in a communication system. To solve this difficult nonconvex problem, the Semidefinite Relaxation (SDR) method is employed to obtain the digital transmitter, the SDR method and penalty convex-concave procedure (CCP) method are employed to obtain the analog transmitter. Simulation results shows four conclusions about the system. Firstly, the larger the SINR target or the energy harvest target, the more transmit power is required. Secondly, the lower the data rate obtained by the eavesdropper, the more transmit power is required. Thirdly, the SDR method and the penalty CCP method complement each other. Finally, the transmit power can be reduced by increasing the number of RF chains or transmit antennas.

Keywords

• Hybrid beamforming
• energy harvesting
• secure communication
• quality of service
• unit modulus constraints