Voluntary Energy Harvesting Relays and Selection in Cooperative Wireless Networks

Medepally, Bhargav and Mehta, Neelesh B (2010) Voluntary Energy Harvesting Relays and Selection in Cooperative Wireless Networks. In: IEEE Transactions on Wireless Communications, 9 (11). pp. 3543-3553.

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Abstract

The use of energy harvesting (EH) nodes as cooperative relays is a promising and emerging solution in wireless systems such as wireless sensor networks. It harnesses the spatial diversity of a multi-relay network and addresses the vexing problem of a relay's batteries getting drained in forwarding information to the destination. We consider a cooperative system in which EH nodes volunteer to serve as amplify-and-forward relays whenever they have sufficient energy for transmission. For a general class of stationary and ergodic EH processes, we introduce the notion of energy constrained and energy unconstrained relays and analytically characterize the symbol error rate of the system. Further insight is gained by an asymptotic analysis that considers the cases where the signal-to-noise-ratio or the number of relays is large. Our analysis quantifies how the energy usage at an EH relay and, consequently, its availability for relaying, depends not only on the relay's energy harvesting process, but also on its transmit power setting and the other relays in the system. The optimal static transmit power setting at the EH relays is also determined. Altogether, our results demonstrate how a system that uses EH relays differs in significant ways from one that uses conventional cooperative relays.

Item Type:	Journal Article
Publication:	IEEE Transactions on Wireless Communications
Publisher:	IEEE
Additional Information:	Copyright 2010 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.
Keywords:	Energy harvesting; relays; selection; cooperative systems; diversity methods; modulation; fading channels; amplify-and-forward; energy storage; wireless sensor networks
Department/Centre:	Division of Electrical Sciences > Electrical Communication Engineering
Date Deposited:	13 Dec 2010 09:52
Last Modified:	13 Dec 2010 09:52
URI:	http://eprints.iisc.ac.in/id/eprint/34457

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