The evolution of non-orthogonal multiple access (NOMA) has raised many opportunities for massive connectivity with less latency in signal transmissions at great distances. We aim to integrate NOMA with a satellite communications network to evaluate system performance under the impacts of imperfect channel state information and co-channel interference from nearby systems. In our considered system, two users perform downlink communications under power-domain NOMA. We analyzed the performance of this system with two modes of shadowing effect: heavy shadowing and average shadowing. The detailed performance was analyzed in terms of the outage probability and ergodic capacity of the system. We derive closed-form expressions and performed a numerical analysis. We discover that the performance of two destinations depends on the strength of the transmit power at the satellite. However, floor outage occurs because the system depends on other parameters, such as satellite link modes, noise levels, and the number of interference sources. To verify the authenticity of the derived closed-form expressions, we also perform Monte-Carlo simulations.

非正交多路访问 (NOMA) 的发展为大规模连接带来了许多机会，并且在远距离信号传输中具有更少的延迟。我们的目标是将 NOMA 与卫星通信网络集成，以评估在不完善的信道状态信息和来自附近系统的同信道干扰的影响下的系统性能。在我们考虑的系统中，两个用户在功率域 NOMA 下执行下行链路通信。我们分析了该系统在两种阴影效果模式下的性能：重阴影和平均阴影。从系统的中断概率和遍历容量方面分析了详细的性能。我们推导出封闭式表达式并进行数值分析。我们发现两个目的地的性能取决于卫星发射功率的强度。但是，由于系统依赖于其他参数，例如卫星链路模式、噪声水平和干扰源的数量，所以会发生楼层中断。为了验证派生的封闭式表达式的真实性，我们还进行了蒙特卡罗模拟。