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Power Allocation for Channel Estimation and EnergyBeamforming in Wirelessly Powered Sensor Networks
KTH, School of Electrical Engineering and Computer Science (EECS), Network and Systems engineering.ORCID iD: 0000-0002-1934-9208
KTH, School of Electrical Engineering and Computer Science (EECS), Network and Systems engineering.ORCID iD: 0000-0001-9810-3478
2018 (English)In: Proceedings of IEEE International Conference on Communications Workshops, 2018Conference paper, Published paper (Refereed)
Abstract [en]

Wirelessly powered sensor networks (WPSNs) are becoming increasingly important to monitor many internet-of-things systems. In these WPSNs, dedicated base stations (BSs) with multiple antennas charge the sensor nodes without the need of replacing their batteries thanks to two essential procedures: i)  getting of the channel state information of the nodes by sending pilots, and based on this, ii) performing energy beamforming to transmit energy to the nodes. However, the BSs have limited power budget and thus these two procedures are not independent, contrarily to what  is assumed in some previous studies. In this paper, we investigate the novel problem of how to optimally allocate the power for channel estimation and energy transmission. Although the problem is non-convex, we provide a new solution approach and a performance analysis in terms of optimality and complexity. We also provide a closed form solution for the case where the channels are estimated based on a least square estimation. The simulations show a gain of approximately 10% in allocating the power optimally, and the importance of improving the channel estimation efficiency.

Place, publisher, year, edition, pages
2018.
National Category
Communication Systems Embedded Systems
Research subject
Electrical Engineering
Identifiers
URN: urn:nbn:se:kth:diva-233458DOI: 10.1109/ICCW.2018.8403568ISI: 000445022200083Scopus ID: 2-s2.0-85050271142ISBN: 978-1-5386-4328-0 (electronic)OAI: oai:DiVA.org:kth-233458DiVA, id: diva2:1240009
Conference
IEEE International Conference on Communications, IEEE Workshop on Energy Harvesting Wireless Communications
Note

QC 20180820

Available from: 2018-08-20 Created: 2018-08-20 Last updated: 2019-04-29Bibliographically approved

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Publisher's full textScopushttps://ieeexplore.ieee.org/abstract/document/8403568/

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CiteExportLink to record
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Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
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Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
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  • Other locale
More languages
Output format
  • html
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  • asciidoc
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