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.

认知无线电非正交多址访问（CR-NOMA）技术可以通过结合认知无线电和非正交多址访问来增强对整个资源的感知，并改善用户访问和频谱利用率。本文提出了一种基于CR-NOMA的星空地面协作网络多天线选择方案，重点是在不增加对主要用户干扰的前提下，最大化次要用户速率。首先，考虑到具有多天线配置的系统场景，我们计算了每个用户的信号干扰加噪声比（SINR）。然后，得出每个用户的确切中断概率表达式和渐近中断概率表达式。最后，