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. 2021 May 4;21(9):3186. doi: 10.3390/s21093186

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© 2021 by the author.

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 (https://creativecommons.org/licenses/by/4.0/).

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Performance comparison versus the maximum transmit power ( $P_{\max}$ ). (a) Sum energy efficiency vs. $P_{\max}$ . (b) Sum spectral efficiency vs. $P_{\max}$ . (c) Average transmit power vs. $P_{\max}$ .