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Power Allocation for Channel Estimation and EnergyBeamforming in Wirelessly Powered Sensor Networks
KTH, Skolan för elektroteknik och datavetenskap (EECS), Nätverk och systemteknik.ORCID-id: 0000-0002-1934-9208
KTH, Skolan för elektroteknik och datavetenskap (EECS), Nätverk och systemteknik.ORCID-id: 0000-0001-9810-3478
2018 (Engelska)Ingår i: Proceedings of IEEE International Conference on Communications Workshops, 2018Konferensbidrag, Publicerat paper (Refereegranskat)
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.

Ort, förlag, år, upplaga, sidor
2018.
Nationell ämneskategori
Kommunikationssystem Inbäddad systemteknik
Forskningsämne
Elektro- och systemteknik
Identifikatorer
URN: urn:nbn:se:kth:diva-233458DOI: 10.1109/ICCW.2018.8403568ISI: 000445022200083Scopus ID: 2-s2.0-85050271142ISBN: 978-1-5386-4328-0 (digital)OAI: oai:DiVA.org:kth-233458DiVA, id: diva2:1240009
Konferens
IEEE International Conference on Communications, IEEE Workshop on Energy Harvesting Wireless Communications
Anmärkning

QC 20180820

Tillgänglig från: 2018-08-20 Skapad: 2018-08-20 Senast uppdaterad: 2019-04-29Bibliografiskt granskad

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Förlagets fulltextScopushttps://ieeexplore.ieee.org/abstract/document/8403568/

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