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Energies 2016, 9(7), 568; doi:10.3390/en9070568

Multislot Simultaneous Spectrum Sensing and Energy Harvesting in Cognitive Radio

1,3,* , 2
,
3,* , 3
and
2
1
School of Information and Communication Engineering, Dalian University of Technology, Dalian 116024, China
2
School of Information Science and Technology, Dalian Maritime University, Dalian 116026, China
3
Communication Research Center, Harbin Institute of Technology, Harbin 150080, China
*
Authors to whom correspondence should be addressed.
Academic Editor: Hongjian Sun
Received: 8 June 2016 / Revised: 6 July 2016 / Accepted: 15 July 2016 / Published: 21 July 2016
(This article belongs to the Special Issue Wireless Power Transfer 2016)
View Full-Text   |   Download PDF [838 KB, uploaded 21 July 2016]   |  

Abstract

In cognitive radio (CR), the spectrum sensing of the primary user (PU) may consume some electrical power from the battery capacity of the secondary user (SU), resulting in a decrease in the transmission power of the SU. In this paper, a multislot simultaneous spectrum sensing and energy harvesting model is proposed, which uses the harvested radio frequency (RF) energy of the PU signal to supply the spectrum sensing. In the proposed model, the sensing duration is divided into multiple sensing slots consisting of one local-sensing subslot and one energy-harvesting subslot. If the PU is detected to be present in the local-sensing subslot, the SU will harvest RF energy of the PU signal in the energy-harvesting slot, otherwise, the SU will continue spectrum sensing. The global decision on the presence of the PU is obtained through combining local sensing results from all the sensing slots by adopting “Or-logic Rule”. A joint optimization problem of sensing time and time splitter factor is proposed to maximize the throughput of the SU under the constraints of probabilities of false alarm and detection and energy harvesting. The simulation results have shown that the proposed model can clearly improve the maximal throughput of the SU compared to the traditional sensing-throughput tradeoff model. View Full-Text
Keywords: cognitive radio (CR); spectrum sensing; energy harvesting; throughput; detection probability cognitive radio (CR); spectrum sensing; energy harvesting; throughput; detection probability
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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. (CC BY 4.0).

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Liu, X.; Na, Z.; Jia, M.; Gu, X.; Li, X. Multislot Simultaneous Spectrum Sensing and Energy Harvesting in Cognitive Radio. Energies 2016, 9, 568.

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