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Energy efficiency optimization with energy harvesting using harvest-use approach

Research output: Contribution in Book/Report/Proceedings - With ISBN/ISSNConference contribution/Paperpeer-review

Published
Publication date8/06/2015
Host publicationCommunication Workshop (ICCW), 2015 IEEE International Conference on
PublisherIEEE
Pages1982-1987
Number of pages6
ISBN (print)9781467363051
<mark>Original language</mark>English
EventIEEE International Conference on Communications (ICC), 2015 - United Kingdom, London, United Kingdom
Duration: 8/06/201512/06/2015

Conference

ConferenceIEEE International Conference on Communications (ICC), 2015
Country/TerritoryUnited Kingdom
CityLondon
Period8/06/1512/06/15

Conference

ConferenceIEEE International Conference on Communications (ICC), 2015
Country/TerritoryUnited Kingdom
CityLondon
Period8/06/1512/06/15

Abstract

Energy harvesting is emerging as a promising approach to improve the energy efficiency (EE) and to extend the life of wireless networks. This paper focuses on energy-efficient transmission power allocation techniques for a point-to-point communication channel, equipped with a fixed-power battery, as well as a harvest-use battery. Using the fact that the harvested energy does not consume from the fixed battery, EE is formulated as the ratio of Shannon limit (as a function of the sum of the power consumed from the fixed battery and the harvest-use battery) to the sum of the circuit power and power consumed from the fixed battery. For the considered energy harvest-use technique, a time switching approach is used that in each frame, the node harvests energy for a percentage of frame time and transmits data for the rest of the frame time. Using the fact that the formulated EE is a quasi-concave function in transmission power, we use fractional programming to obtain the optimal power level, P̅u, and in-turn, the maximum achievable EE. Analytical derivations show that the maximum achievable EE monotonically increases with harvested power, whereas, P̅u monotonically decreases with it. Simulation results show the effects of harvested energy, fixed-battery power limit, and time switching rate on the maximum achievable EE.

Bibliographic note

©2015 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.