Joint NOMA beamforming and user scheduling for sum rate maximization in a full-duplex system

We consider a full-duplex (FD) system where the uplink (UL) and downlink (DL) users are simultaneously served in the same bandwidth. We propose a new design that incorporates the power allocation for UL users and a joint beamforming and non-orthogonal multiple access for DL users under the effects of both residual self-interference and cochannel interference. In particular, a sum rate maximization problem subject to transmit power constraints and per-user quality of service requirements is introduced. An approximation method is used to efficiently solve the problem. Simulation results verify that the proposed FD scheme outperforms a half-duplex and a conventional FD schemes.