Power and Discrete Rate Adaptation for Energy Harvesting Wireless Nodes

Khairnar, Parag S and Mehta, Neelesh B (2011) Power and Discrete Rate Adaptation for Energy Harvesting Wireless Nodes. In: 2011 IEEE International Conference on Communications (ICC), 5-9 June 2011, Kyoto.

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Abstract

Energy Harvesting (EH) nodes, which harvest energy from the environment in order to communicate over a wireless link, promise perpetual operation of a wireless network with battery-powered nodes. In this paper, we address the throughput optimization problem for a rate-adaptive EH node that chooses its rate from a set of discrete rates and adjusts its power depending on its channel gain and battery state. First, we show that the optimal throughput of an EH node is upper bounded by the throughput achievable by a node that is subject only to an average power constraint. We then propose a simple transmission scheme for an EH node that achieves an average throughput close to the upper bound. The scheme's parameters can be made to account for energy overheads such as battery non-idealities and the energy required for sensing and processing. The effect of these overheads on the average throughput is also analytically characterized.

Item Type:	Conference Paper
Publisher:	IEEE
Additional Information:	Copyright 2011 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.
Department/Centre:	Division of Electrical Sciences > Electrical Communication Engineering
Date Deposited:	27 Dec 2011 09:30
Last Modified:	27 Dec 2011 09:30
URI:	http://eprints.iisc.ac.in/id/eprint/42916

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