The aim of this paper is to analyze the array synthesis for 5 G massive MIMO systems in the line-of-sight working condition. The main result of the numerical investigation performed is that non-uniform arrays are the natural choice in this kind of application. In particular, by using non-equispaced arrays, we show that it is possible to achieve a better average condition number of the channel matrix and a significantly higher spectral efficiency. Furthermore, we verify that increasing the array size is beneficial also for circular arrays, and we provide some useful rules-of-thumb for antenna array design for massive MIMO applications. These results are in contrast to the widely-accepted idea in the 5 G massive MIMO literature, in which the half-wavelength linear uniform array is universally adopted.
@article{arxiv.1705.06804,
title = {Antenna Arrays for Line-of-Sight Massive MIMO: Half Wavelength is not Enough},
author = {Daniele Pinchera and Marco Donald Migliore and Fulvio Schettino and Gaetano Panariello},
journal= {arXiv preprint arXiv:1705.06804},
year = {2017}
}
Comments
updated version of the paper, that now includes additional results on the spectral efficiency