This paper compares the sum rates and rate regions achieved by power-domain NOMA (non-orthogonal multiple access) and standard massive MIMO (multiple-input multiple-output) techniques. We prove analytically that massive MIMO always outperforms NOMA in i.i.d.~Rayleigh fading channels, if a sufficient number of antennas are used at the base stations. The simulation results show that the crossing point occurs already when having 20-30 antennas, which is far less than what is considered for the next generation cellular networks.

翻译：本文比较了电源域域NOMA(非垂直多功能存取)和标准的大型MIMO(多投入多产出)技术所达到的总和率和率区域。 我们通过分析证明,如果基地台使用足够数量的天线,大型MIMO在i.d.~Rayleigh 淡化的频道中总是优于NOMA。模拟结果表明,当拥有20-30个天线时,过境点就已经出现,这远远低于下一代蜂窝网络所考虑的天线。