Beamforming Optimization for Full-Duplex Relay in SIC-Enhanced Cooperative NOMA System

In this paper, a beamforming optimization method for a full-duplex relay in a SIC-enhanced cooperative non-orthogonal multiple access (NOMA) system is proposed, in which the information contained in the signal transferred by the relay is utilized to enhance the successive interference cancellation (SIC) performance at the local “target user”. The beamforming optimization problem is considered in a specific scenario that involves maximizing the rate of the target user while only ensuring the business requirements of the remote”conditional user”. This paper demonstrates that this optimization problem can be formulated as a semidefinite relaxation (SDR) problem. The results indicate that the proposed beamforming optimization method can enhance the rate of the target user and the system sum capacity.