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. 2019 Jul 23;19(14):3239. doi: 10.3390/s19143239

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© 2019 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Group comparison graphical analysis divided by SFs: (a) RSSIs mean values and standard deviations; (b) SNRs mean values and standard deviations; (c) percentage of received packets.