Optimal Wireless Power Transfer with Distributed Transmit Beamforming

다국어 초록 (Multilingual Abstract)

This paper considers the performance of wireless powertransfer (WPT) with distributed transmit beamforming (DTB) ina narrowband setting. One or more receive nodes, each equippedwith energy harvesting and storage capabilities, provide periodicchannel state feedback to a cluster of transmit nodes, each with anindependent local oscillator, to facilitate beamforming and passbandsignal alignment for efficient WPT. Without channel statefeedback, the transmit cluster can not align the passband signals atthe receivers and the receivers can only harvest incoherent power.
Since feedback improves the beamforming gain but requires the receiversto expend energy, there is a fundamental tradeoff betweenthe feedback period and the energy harvesting efficiency. This paperanalyzes the optimal feedback period to maximize the weightedmean energy harvesting rate as a function of the oscillator parameters.
An optimization problem is formulated and an explicitmethod to numerically calculate the globally optimal feedback periodis developed. Numerical results are provided to confirm theanalysis and demonstrate the sensitivity of the weighted mean energyharvesting rate with respect to the feedback period and theDTB system parameters.

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