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Optimal finite horizon sensing for wirelessly powered devices

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Salehi Heydar Abad, Mehdi and Erçetin, Özgür (2019) Optimal finite horizon sensing for wirelessly powered devices. IEEE Access, 7 . pp. 131473-131487. ISSN 2169-3536

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Official URL: http://dx.doi.org/10.1109/ACCESS.2019.2941377

Abstract

We are witnessing a significant advancements in the sensor technologies which has enabled a broad spectrum of applications. Often, the resolution of the produced data by the sensors significantly affects the output quality of an application. We study a sensing resolution optimization problem for a wireless powered device (WPD) that is powered by wireless power transfer (WPT) from an access point (AP). We study a class of harvest-first-transmit-later type of WPT policy, where an access point (AP) first employs RF power to recharge the WPD in the down-link, and then, collects the data from the WPD in the up-link. The WPD optimizes the sensing resolution, WPT duration and dynamic power control in the up-link to maximize an application dependant utility at the AP. The utility of a transmitted packet is only achieved if the data is delivered successfully within a finite time. Thus, we first study a finite horizon throughput maximization problem by jointly optimizing the WPT duration and power control. We prove that the optimal WPT duration obeys a time-dependent threshold form depending on the energy state of the WPD. In the subsequent data transmission stage, the optimal transmit power allocations for the WPD is shown to posses a channel-dependent fractional structure. Then, we optimize the sensing resolution of the WPD by using a Bayesian inference based multi armed bandit problem with fast convergence property to strike a balance between the quality of the sensed data and the probability of successfully delivering it.

Item Type:Article
Uncontrolled Keywords:Bayesian inference; multi-armed bandit; reinforcement learning; wireless power transfer
Subjects:T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK5101-6720 Telecommunication
ID Code:40193
Deposited By:Özgür Erçetin
Deposited On:16 Sep 2020 23:00
Last Modified:16 Sep 2020 23:00

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