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Open AccessArticle

Residual Energy Analysis in Cognitive Radios with Energy Harvesting UAV under Reliability and Secrecy Constraints

by Waqas Khalid 1, Heejung Yu 1,* and Song Noh 2,*
1
Department of Electronics and Information Engineering, Korea University, Sejong 30019, Korea
2
Department of Information and Telecommunication Engineering, Incheon National University, Incheon 22012, Korea
*
Authors to whom correspondence should be addressed.
Sensors 2020, 20(10), 2998; https://doi.org/10.3390/s20102998
Received: 22 April 2020 / Revised: 19 May 2020 / Accepted: 22 May 2020 / Published: 25 May 2020
The integration of unmanned aerial vehicles (UAVs) with a cognitive radio (CR) technology can improve the spectrum utilization. However, UAV network services demand reliable and secure communications, along with energy efficiency to prolong battery life. We consider an energy harvesting UAV (e.g., surveillance drone) flying periodically in a circular track around a ground-mounted primary transmitter. The UAV, with limited-energy budget, harvests radio frequency energy and uses the primary spectrum band opportunistically. To obtain intuitive insight into the performance of energy-harvesting, and reliable and secure communications, the closed-form expressions of the residual energy, connection outage probability, and secrecy outage probability, respectively, are analytically derived. We construct the optimization problems of residual energy with reliable and secure communications, under scenarios without and with an eavesdropper, respectively, and the analytical solutions are obtained with the approximation of perfect sensing. The numerical simulations verify the analytical results and identify the requirements of length of sensing phase and transmit power for the maximum residual energy in both reliable and secure communication scenarios. Additionally, it is shown that the residual energy in secure communication is lower than that in reliable communication. View Full-Text
Keywords: unmanned aerial vehicle; cognitive radio; spectrum sensing; energy harvesting; connection outage probability; secrecy outage probability unmanned aerial vehicle; cognitive radio; spectrum sensing; energy harvesting; connection outage probability; secrecy outage probability
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Khalid, W.; Yu, H.; Noh, S. Residual Energy Analysis in Cognitive Radios with Energy Harvesting UAV under Reliability and Secrecy Constraints. Sensors 2020, 20, 2998.

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