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The Scientific World Journal
Volume 2014, Article ID 370658, 7 pages
http://dx.doi.org/10.1155/2014/370658
Research Article

Optimal Throughput for Cognitive Radio with Energy Harvesting in Fading Wireless Channel

School of Electrical Engineering, University of Ulsan, Muger-Dong San-29, Ulsan 680-749, Republic of Korea

Received 14 August 2013; Accepted 19 October 2013; Published 20 January 2014

Academic Editors: J. M. Corchado Rodriguez and H. Yang

Copyright © 2014 Hiep Vu-Van and Insoo Koo. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Energy resource management is a crucial problem of a device with a finite capacity battery. In this paper, cognitive radio is considered to be a device with an energy harvester that can harvest energy from a non-RF energy resource while performing other actions of cognitive radio. Harvested energy will be stored in a finite capacity battery. At the start of the time slot of cognitive radio, the radio needs to determine if it should remain silent or carry out spectrum sensing based on the idle probability of the primary user and the remaining energy in order to maximize the throughput of the cognitive radio system. In addition, optimal sensing energy and adaptive transmission power control are also investigated in this paper to effectively utilize the limited energy of cognitive radio. Finding an optimal approach is formulated as a partially observable Markov decision process. The simulation results show that the proposed optimal decision scheme outperforms the myopic scheme in which current throughput is only considered when making a decision.