This paper investigates the performance of network non-orthogonal multiple access (N-NOMA) in a downlink coordinated multi-point (CoMP) system. In the considered N-NOMA scheme, multiple base stations (BSs) cooperatively serve a CoMP user, meanwhile, each BS serves additional NOMA users by occupying the same resource block allocated to the CoMP user. The locations of the BSs and users are modeled by stochastic geometric models and the interference from the whole network is considered. Through rigorous derivations, the outage probabilities achieved by the CoMP and NOMA users are obtained, respectively. Numerical results are provided to verify the accuracy of the analytical results and also demonstrate the superior performance of N-NOMA compared to orthogonal multiple access (OMA) based CoMP scheme.

翻译：本文研究了网络非正交多址接入(N-NOMA)在下行协同多点(CoMP)系统中的性能。在所考虑的N-NOMA方案中，多个基站(BSs)协作服务一个CoMP用户，同时每个基站通过占用分配给该CoMP用户的同一资源块服务额外的NOMA用户。基站和用户的位置采用随机几何模型建模，并考虑了整个网络的干扰。通过严格推导，分别获得了CoMP和NOMA用户的中断概率。数值结果验证了分析结果的准确性，并展示了N-NOMA相比基于正交多址接入(OMA)的CoMP方案的优越性能。