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Electronics 2017, 6(3), 57; doi:10.3390/electronics6030057

Antenna Arrays for Line-of-Sight Massive MIMO: Half Wavelength Is Not Enough

DIEI and ELEDIA, University of Cassino and Southern Lazio, via G. Di Biasio 43, 03043 Cassino, Italy
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Received: 22 July 2017 / Revised: 7 August 2017 / Accepted: 8 August 2017 / Published: 10 August 2017
(This article belongs to the Special Issue Reconfigurable Antennas)

Abstract

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. View Full-Text
Keywords: MIMO; antenna arrays; line-of-sight propagation; millimeter wave propagation; 5 G mobile communication MIMO; antenna arrays; line-of-sight propagation; millimeter wave propagation; 5 G mobile communication
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Pinchera, D.; Migliore, M.D.; Schettino, F.; Panariello, G. Antenna Arrays for Line-of-Sight Massive MIMO: Half Wavelength Is Not Enough. Electronics 2017, 6, 57.

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