Low-Complexity Beamforming Design for Full-Duplex Relay-Assisted Cooperative NOMA

Abstract

In this paper, we propose a beamforming design method for a cooperative NOMA downlink system wherein a relay node assisting a far user operates in full-duplex mode to achieve high spectral efficiency. The proposed method, based on the zero-forcing (ZF) principle, suppresses both self-interference and inter-user interference. Simulation results show that the proposed method is considerably superior to the conventional transmit ZF method, achieving performance comparable to that of the optimum method while reducing complexity.