A novel multi-antenna selection scheme of satellite-aerial-terrestrial cooperative network based on CR-NOMA

Abstract Cognitive radio non-orthogonal multiple access (CR-NOMA) technique can enhance the perception of whole resources by combining cognitive radio and non-orthogonal multiple access, and improve user access and spectrum utilization. This paper proposes a multi-antenna selection scheme for satellite-aerial-terrestrial cooperative network based on CR-NOMA,and focus on maximizing the secondary users’ rate while without generating additional interference to the primary user. Firstly, considering the system scenario with the multi-antenna configuration, we calculate the signal-to-interference-plus-noise ratio (SINR) at each user. Then, the exact outage probability expression and the asymptotic outage probability expression of each user are derived. Finally, simulation results are provided to verify the superiority of the proposed scheme and the accuracy of the theoretical results, and analyze the influence of various channel parameters on system performance.