Multi-relay selection of hybrid satellite-terrestrial cooperative network based on CR-NOMA in AF mode

This paper investigates the impact of relay selection on cognitive radio non-orthogonal multiple access (CR-NOMA) based satellite-ground cooperation network. By analyzing the signal-to-interference-plus-noise ratio (SINR) at the User 1, we propose a two-stage relay selection scheme, and derive the exact outage probability expression and the progressive probability expression of the primary user. Finally, theoretical simulations are used to verify the correctness of the deduced results and the impact of related variables on system performance.