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Massive MIMO is a reality-What is next? Five promising research directions for antenna arrays
Linköping University, Department of Electrical Engineering, Communication Systems. Linköping University, Faculty of Science & Engineering.ORCID iD: 0000-0002-5954-434X
Univ Pisa, Italy.
Chalmers Univ Technol, Sweden.
Paris Saclay, France.
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2019 (English)In: Digital signal processing (Print), ISSN 1051-2004, E-ISSN 1095-4333, Vol. 94Article in journal (Refereed) Published
Abstract [en]

Massive MIMO (multiple-input multiple-output) is no longer a "wild" or "promising" concept for future cellular networks-in 2018 it became a reality. Base stations (BSs) with 64 fully digital transceiver chains were commercially deployed in several countries, the key ingredients of Massive MIMO have made it into the 5G standard, the signal processing methods required to achieve unprecedented spectral efficiency have been developed, and the limitation due to pilot contamination has been resolved. Even the development of fully digital Massive MIMO arrays for mmWave frequencies-once viewed prohibitively complicated and costly-is well underway. In a few years, Massive MIMO with fully digital transceivers will be a mainstream feature at both sub-6 GHz and mmWave frequencies. In this paper, we explain how the first chapter of the Massive MIMO research saga has come to an end, while the story has just begun. The coming wide-scale deployment of BSs with massive antenna arrays opens the door to a brand new world where spatial processing capabilities are omnipresent. In addition to mobile broadband services, the antennas can be used for other communication applications, such as low-power machine-type or ultra-reliable communications, as well as non-communication applications such as radar, sensing and positioning. We outline five new Massive MIMO related research directions: Extremely large aperture arrays, Holographic Massive MIMO, Six-dimensional positioning, Large-scale MIMO radar, and Intelligent Massive MIMO. (C) 2019 Elsevier Inc. All rights reserved.

Place, publisher, year, edition, pages
ACADEMIC PRESS INC ELSEVIER SCIENCE , 2019. Vol. 94
Keywords [en]
Massive MIMO; Future directions; Communications; Positioning and radar; Machine learning
National Category
Signal Processing
Identifiers
URN: urn:nbn:se:liu:diva-162057DOI: 10.1016/j.dsp.2019.06.007ISI: 000493417500002OAI: oai:DiVA.org:liu-162057DiVA, id: diva2:1371361
Available from: 2019-11-19 Created: 2019-11-19 Last updated: 2019-11-19

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