Evaluation of antenna and relay scheme for cooperative non-orthogonal multiple access

An antenna selection followed by a relay selection scheme (ASRS) is proposed for cooperative non-orthogonal multiple access (NOMA)-based network. The proposed work selects an antenna to maximise the instantaneous rate of poor channel condition users while providing good quality of services (QoS). The outage probability performance of the proposed scheme is plotted for different antenna configuration while varying the SNR and distance with variable number of antennas and available relays. The fairness factor of the proposed work is also discussed, considering three different density areas. The proposed scheme is compared with novel schemes in literature for average sum rate and average energy efficiency to show its superiority.