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.
@article{arxiv.2112.15493,
title = {NOMA Versus Massive MIMO in Rayleigh Fading},
author = {Kamil Senel and Hei Victor Cheng and Emil Björnson and Erik G. Larsson},
journal= {arXiv preprint arXiv:2112.15493},
year = {2022}
}
Comments
Published at the 2019 IEEE International Workshop on Signal Processing Advances in Wireless Communications (SPAWC), 5 pages, 5 figures. arXiv admin note: substantial text overlap with arXiv:1809.07072