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Experimental Exploration of Unlicensed Sub-GHz Massive MIMO for Massive Internet-of-Things

Callebaut, Gilles ; Gunnarsson, Sara LU ; Guevara, Andrea P. ; Johansson, Anders J. LU orcid ; Van Der Perre, Liesbet LU and Tufvesson, Fredrik LU orcid (2021) In IEEE Open Journal of the Communications Society 2. p.2195-2204
Abstract

IoT networks are getting overcrowded following the vast increase in number of Internet-of-Things (IoT) devices and connections. Networks can be extended with more gateways, increasing the number of supported devices. However, as investigated in this work, massive MIMO has the potential to increase the number of simultaneous connections and moreover lower the energy expenditure of these devices. We present a study of the channel characteristics of massive MIMO in the narrowband unlicensed sub-GHz band. The goal is to support IoT applications with strict requirements in terms of number of devices, power consumption, and reliability. The assessment is based on experimental measurements using both a uniform linear and a rectangular array.... (More)

IoT networks are getting overcrowded following the vast increase in number of Internet-of-Things (IoT) devices and connections. Networks can be extended with more gateways, increasing the number of supported devices. However, as investigated in this work, massive MIMO has the potential to increase the number of simultaneous connections and moreover lower the energy expenditure of these devices. We present a study of the channel characteristics of massive MIMO in the narrowband unlicensed sub-GHz band. The goal is to support IoT applications with strict requirements in terms of number of devices, power consumption, and reliability. The assessment is based on experimental measurements using both a uniform linear and a rectangular array. Our study demonstrates and validates the advantages of deploying massive MIMO gateways to serve IoT nodes. While the results are general, here we specifically focus on static nodes. The array gain and channel hardening effect yield opportunities to lower the transmit power of IoT nodes while also increasing reliability. The exploration confirms that exploiting large arrays brings great opportunities to connect a massive number of IoT devices by separating the nodes in the spatial domain. In addition, we give an outlook on how static IoT nodes could be scheduled based on partial channel state information.

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Please use this url to cite or link to this publication:
author
; ; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Channel measurements, Internet-of-Things, low-power wide-area networks, massive MIMO, sub-GHz, test-bed and trials
in
IEEE Open Journal of the Communications Society
volume
2
pages
10 pages
publisher
IEEE - Institute of Electrical and Electronics Engineers Inc.
external identifiers
  • scopus:85122047503
ISSN
2644-125X
DOI
10.1109/OJCOMS.2021.3113088
language
English
LU publication?
yes
additional info
Publisher Copyright: © 2020 IEEE.
id
c07ca69b-da8f-4970-a4e7-84b416299254
date added to LUP
2022-01-24 13:37:05
date last changed
2024-03-23 17:30:58
@article{c07ca69b-da8f-4970-a4e7-84b416299254,
  abstract     = {{<p>IoT networks are getting overcrowded following the vast increase in number of Internet-of-Things (IoT) devices and connections. Networks can be extended with more gateways, increasing the number of supported devices. However, as investigated in this work, massive MIMO has the potential to increase the number of simultaneous connections and moreover lower the energy expenditure of these devices. We present a study of the channel characteristics of massive MIMO in the narrowband unlicensed sub-GHz band. The goal is to support IoT applications with strict requirements in terms of number of devices, power consumption, and reliability. The assessment is based on experimental measurements using both a uniform linear and a rectangular array. Our study demonstrates and validates the advantages of deploying massive MIMO gateways to serve IoT nodes. While the results are general, here we specifically focus on static nodes. The array gain and channel hardening effect yield opportunities to lower the transmit power of IoT nodes while also increasing reliability. The exploration confirms that exploiting large arrays brings great opportunities to connect a massive number of IoT devices by separating the nodes in the spatial domain. In addition, we give an outlook on how static IoT nodes could be scheduled based on partial channel state information. </p>}},
  author       = {{Callebaut, Gilles and Gunnarsson, Sara and Guevara, Andrea P. and Johansson, Anders J. and Van Der Perre, Liesbet and Tufvesson, Fredrik}},
  issn         = {{2644-125X}},
  keywords     = {{Channel measurements; Internet-of-Things; low-power wide-area networks; massive MIMO; sub-GHz; test-bed and trials}},
  language     = {{eng}},
  pages        = {{2195--2204}},
  publisher    = {{IEEE - Institute of Electrical and Electronics Engineers Inc.}},
  series       = {{IEEE Open Journal of the Communications Society}},
  title        = {{Experimental Exploration of Unlicensed Sub-GHz Massive MIMO for Massive Internet-of-Things}},
  url          = {{http://dx.doi.org/10.1109/OJCOMS.2021.3113088}},
  doi          = {{10.1109/OJCOMS.2021.3113088}},
  volume       = {{2}},
  year         = {{2021}},
}