University of Oulu

O. L. A. López, S. Montejo-Sánchez, R. D. Souza, C. B. Papadias and H. Alves, "On CSI-Free Multiantenna Schemes for Massive RF Wireless Energy Transfer," in IEEE Internet of Things Journal, vol. 8, no. 1, pp. 278-296, 1 Jan.1, 2021, doi: 10.1109/JIOT.2020.3003114

On CSI-free multiantenna schemes for massive RF wireless energy transfer

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Author: López, Onel L. A.1; Montejo-Sánchez, Samuel2; Souza, Richard D.3;
Organizations: 1Centre for Wireless Communications (CWC), University of Oulu, Finland
2Programa Institucional de Fomento a la I+D+i, Universidad Tecnol´ogica Metropolitana, Santiago, Chile
3Federal University of Santa Catarina (UFSC), Florianópolis, Brazil
4Research, Technology & Innovation Network (RTIN) at The American College of Greece, Athens 15342, Greece
Format: article
Version: accepted version
Access: open
Online Access: PDF Full Text (PDF, 1.7 MB)
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Language: English
Published: Institute of Electrical and Electronics Engineers, 2021
Publish Date: 2021-04-26


Radio-frequency wireless energy transfer (RF-WET) is emerging as a potential green enabler for massive Internet of Things (IoT). Herein, we analyze channel state information (CSI)free multiantenna strategies for powering wirelessly a large set of single-antenna IoT devices. The CSI-free schemes are AASS (AA-IS), where all antennas transmit the same (independent) signal(s), and SA, where just one antenna transmits at a time such that all antennas are utilized during the coherence block. We characterize the distribution of the provided energy under correlated Rician fading for each scheme and find out that while AA-IS and SA cannot take advantage of the multiple antennas to improve the average provided energy, its dispersion can be significantly reduced. Meanwhile, AA-SS provides the greatest average energy, but also the greatest energy dispersion, and the gains depend critically on the mean phase shifts between the antenna elements. We find that consecutive antennas must be π-phase shifted for optimum average energy performance under AA-SS. Our numerical results evidence that correlation is beneficial under AA-SS, while a greater line of sight (LOS) and/or the number of antennas is not always beneficial under such a scheme. Meanwhile, both AA-IS and SA schemes benefit from small correlation, large LOS, and/or a large number of antennas. Finally, AA-SS (SA and AA-IS) is (are) preferable when devices are (are not) clustered in specific spatial directions.

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Series: IEEE internet of things journal
ISSN: 2372-2541
ISSN-E: 2327-4662
ISSN-L: 2327-4662
Volume: 8
Issue: 1
Pages: 278 - 296
DOI: 10.1109/JIOT.2020.3003114
Type of Publication: A1 Journal article – refereed
Field of Science: 213 Electronic, automation and communications engineering, electronics
Funding: This work is supported by Academy of Finland (Aka) (Grants n.307492, n.318927 (6Genesis Flagship), n.319008 (EE-IoT)), as well as Finnish Foundation for Technology Promotion, FIREMAN (Grant n.326301), FONDECYT Postdoctoral Grant n.3170021 in Chile, the National Council for Scientific and Technological Development (CNPq) and by project Print CAPES-UFSCb“Automation 4.0” in Brazil.
Academy of Finland Grant Number: 307492
Detailed Information: 307492 (Academy of Finland Funding decision)
318927 (Academy of Finland Funding decision)
319008 (Academy of Finland Funding decision)
326301 (Academy of Finland Funding decision)
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