Beamforming optimisation in energy harvesting cooperative full-duplex networks with self-energy recycling protocol

This paper considers the problem of beamforming optimization in an amplify-and-forward (AF) relaying cooperative network, in which the relay node harvests the energy from the radio-frequency (RF) signal. Based on the self-energy recycling relay protocol, we study the beamforming optimization problem. The formulated problem aims to maximize the achievable rate subject to the available transmitted power at the relay node. We develop a semidefinite programming (SDP) relaxation method to solve the proposed problem. We also use SDP and one-dimension (1-D) optimization to solve the beamforming optimization based on a time-switching relaying protocol as a benchmark. The simulation results are presented to verify that the self-energy recycling protocol achieves a significant rate gain compared to the time-switching relaying protocol and the power-splitting relaying protocol.