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Optimal relay placement in two-hop RF energy transfer
Department of Electrical Engineering, IIT Delhi, India.ORCID iD: 0000-0002-3225-6495
Department of Electrical Engineering, IIT Delhi, India.
2015 (English)In: IEEE Transactions on Communications, ISSN 0090-6778, E-ISSN 1558-0857, Vol. 63, no 5, p. 1635-1647Article in journal (Refereed) Published
Abstract [en]

Recently, wireless radio frequency energy transfer (RFET) has emerged as an effective technology for prolonging lifetime of the energy-limited wireless sensor networks. However, low RFET efficiency is still a fundamental bottleneck in its widespread usage. Multi-hop RF energy transfer (MHET) can improve the RFET efficiency by deploying relay nodes that scavenge the dispersed energy and transfer it to the nearby sensor node. The efficiency of MHET is strongly influenced by the relay node’s placement. To maximize the RFET efficiency for a two-hop scenario, in this paper a novel optimization model is proposed to determine the optimal relay placement (ORP) on an Euclidean x-y plane. Nontrivial tradeoff between the energy scavenged at the relay versus the effective energy delivered by the relay to the target node is investigated. Due to the nonconvex and highly nonlinear nature of the optimization problem, an α-based branch and bound algorithm has been used. The proposed optimization model is further extended by incorporating distributed beamforming to enhance the RFET efficiency. Numerical results illustrate that the proposed algorithm provides convergence to the ∈-global optimal solution in a few iterations, and ORP provides significant energy saving over arbitrary relay positions for commercial RF energy harvesting systems.

Place, publisher, year, edition, pages
Institute of Electrical and Electronics Engineers (IEEE), 2015. Vol. 63, no 5, p. 1635-1647
Keywords [en]
Algorithms; Beamforming; Branch and bound method; Capacitors; Energy conservation; Energy harvesting; Energy transfer; Optimization; Radio waves; Receivers (containers); Sensor nodes; Signal processing; Signal receivers; Wireless sensor networks; X-Y model, Array signal processing; Distributed beam-forming; Energy exchanges; Energy transfer efficiency; Optimal relay placements; Radio frequencies; Relays; Rf energies; RF energy harvesting, Energy efficiency
National Category
Computer and Information Sciences Signal Processing Communication Systems
Identifiers
URN: urn:nbn:se:liu:diva-155762DOI: 10.1109/TCOMM.2015.2418253OAI: oai:DiVA.org:liu-155762DiVA, id: diva2:1299040
Note

cited By 21

Available from: 2019-03-26 Created: 2019-03-26 Last updated: 2019-03-26Bibliographically approved

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Mishra, Deepak

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  • apa
  • harvard1
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  • de-DE
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  • Other locale
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Output format
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