Max-Min Optimal Beamforming for Cell-Free Massive MIMO
Abstract
This letter develops an optimum beamforming method for downlink transmissions in cell-free massive multiple-input multiple-output (MIMO) systems, which employ a massive number of distributed access points to provide concurrent services to multiple users. The optimum design is formulated as a max-min problem that maximizes the minimum signal-to-interference-plus-noise ratio of all users. It is shown analytically that the problem is quasi-concave, and the optimum solution is obtained with the second-order cone programming. The proposed method identifies the best achievable beamforming performance in cell-free massive MIMO systems. The results can be used as benchmarks for the design of practical low complexity beamformers.
Cite
@article{arxiv.2006.05598,
title = {Max-Min Optimal Beamforming for Cell-Free Massive MIMO},
author = {Andong Zhou and Jingxian Wu and Erik G. Larsson and Pingzhi Fan},
journal= {arXiv preprint arXiv:2006.05598},
year = {2020}
}
Comments
5 pages, 2 figures, to be published in IEEE Communications Letters