Experimental Exploration of Unlicensed Sub-GHz Massive MIMO for Massive Internet-of-Things
(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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- author
- Callebaut, Gilles ; Gunnarsson, Sara LU ; Guevara, Andrea P. ; Johansson, Anders J. LU ; Van Der Perre, Liesbet LU and Tufvesson, Fredrik LU
- organization
- publishing date
- 2021
- 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}}, }