Due to the increasing demand for higher capacity in mobile communication devices, non-orthogonal multiple access (NOMA) has become a promising technique. Compared to existing orthogonal multiple access methods, NOMA can serve multiple users with better spectral efficiency by allowing co-channel interference, thus its reliability performance over various channel models needs further research. In this paper, closed-form outage probability, average channel capacity and symbol error rate are derived for a downlink-NOMA system with an arbitrary number of users over generalized-K fading channels. Finally, theoretical findings are validated via Monte Carlo simulations for several channel parameters.

由于移动通信设备对更高容量的需求不断增加，非正交多址 (NOMA) 已成为一种有前途的技术。与现有的正交多址方法相比，NOMA 可以通过允许同信道干扰以更好的频谱效率为多个用户服务，因此其在各种信道模型上的可靠性性能需要进一步研究。在本文中，对于在广义 K 衰落信道上具有任意数量用户的下行链路 NOMA 系统，推导出封闭形式的中断概率、平均信道容量和符号错误率。最后，通过蒙特卡罗模拟对几个通道参数进行了验证。