Abstract
We consider a full-duplex (FD) cellular network, where two pairs of downlink and uplink users simultaneously communicate with a multi-antenna FD base station (BS) via non-orthogonal multiple access (NOMA). The downlink sum-rate of the system is maximized by optimizing the receive and transmit beamformers at the BS, while specific rates for the uplink users are guaranteed. The resulting non-convex problem is solved using an alternating optimization approach based on semi-definite relaxation and one-dimensional line-search approach. To achieve a low-complexity implementation, we incorporate zero-forcing self-interference suppression constraint at the BS, and derive closed-form expression for the receive beamformer. In order to manage the interference between the downlink and uplink users, two user scheduling algorithms, namely Nearest Near and Furthest Far user (NNFF) Scheduling and Random Near and Random Far (RNRF) User Scheduling are proposed based on the cell partitioning method. Numerical results show that FD-NOMA system with optimum and suboptimum beamforming designs significantly improve the system’s ergodic sum-rate compared to the half-duplex counterpart. Moreover, in the FD-NOMA system, NNFF user scheduling can achieve up to 25% average sum-rate gain as compared with the RNRF user scheduling algorithm.
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