On the Feasibility of Wireless Energy Transfer Using Massive Antenna Arrays
2016 (English)In: IEEE Transactions on Wireless Communications, ISSN 1536-1276, E-ISSN 1558-2248, Vol. 15, no 5, 3466-3480 p.Article in journal (Refereed) PublishedText
We illustrate potential benefits of using massive antenna arrays for wireless energy transfer (WET). Specifically, we analyze probability of outage in WET over fading channels when a base station (BS) with multiple antennas beamforms energy to a wireless sensor node (WSN). Our analytical results show that by using massive antenna arrays, the range of WET can be increased for a given target outage probability. We prove that by using multiple-antenna arrays at the BS, a lower downlink energy is required to get the same outage performance, resulting in savings of radiated energy. We show that for energy levels used in WET, the outage performance with least-squares or minimum mean-square-error channel estimates is the same as that obtained based on perfect channel estimates. We observe that a strong line-of-sight component between the BS and WSN lowers outage probability. Furthermore, by deploying more antennas at the BS, a larger energy can be transferred reliably to the WSN at a given target outage performance for the sensor to be able to perform its main tasks. In our numerical examples, the RF power received at the input of the sensor is assumed to be on the order of a mW, such that the rectenna operates at an efficiency in the order of 50%.
Place, publisher, year, edition, pages
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC , 2016. Vol. 15, no 5, 3466-3480 p.
Wireless energy transfer; massive MIMO; beamforming; outage probability; array gain
IdentifiersURN: urn:nbn:se:liu:diva-130303DOI: 10.1109/TWC.2016.2521739ISI: 000378504100027OAI: oai:DiVA.org:liu-130303DiVA: diva2:950562
Funding Agencies|Swedish Research Council (VR); ELLIIT2016-08-012016-07-282016-08-31