Dynamic RF combining for multi-antenna ambient energy harvesting
López, Onel L. A.; Clerckx, Bruno; Latva-Aho, Matti (2021-12-08)
O. L. A. López, B. Clerckx and M. Latva-Aho, "Dynamic RF Combining for Multi-Antenna Ambient Energy Harvesting," in IEEE Wireless Communications Letters, vol. 11, no. 3, pp. 493-497, March 2022, doi: 10.1109/LWC.2021.3133623
© The Author(s) 2022. This work is licensed under a Creative Commons Attribution 4.0 License. For more information, see https://creativecommons.org/licenses/by/4.0/.
https://creativecommons.org/licenses/by/4.0/
https://urn.fi/URN:NBN:fi-fe2022051736110
Tiivistelmä
Abstract
Ambient radio frequency (RF) energy harvesting (EH) technology is key to realize self-sustainable, always-on, low-power, massive Internet of Things networks. Typically, rigid (non-adaptable to channel fluctuations) multi-antenna receive architectures are proposed to support reliable EH operation. Herein, we introduce a dynamic RF combining architecture for ambient RF EH use cases, and exemplify the attainable performance gains via three simple phase shifts’ exploration mechanisms, namely, brute force (BF), sequential testing (ST) and codebook based (CB). Among the proposed mechanisms, BF demands the highest power consumption, while CB requires the highest-resolution phase shifters, thus tipping the scales in favor of ST. Finally, we show that the performance gains of ST over a rigid RF combining scheme increase with the number of receive antennas and energy transmitters’ deployment density.
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