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Entropy 2019, 21(2), 217; https://doi.org/10.3390/e21020217

Secrecy Performance Enhancement for Underlay Cognitive Radio Networks Employing Cooperative Multi-Hop Transmission with and without Presence of Hardware Impairments

1
VSB—Technical University of Ostrava, 17. listopadu 15/2172, 708 33 Ostrava, Poruba, Czech Republic
2
Faculty of Electronics Technology, Industrial University of Ho Chi Minh City, Ho Chi Minh City 71408, Vietnam
3
Faculty of Radio-Electronics Engineering, Le Quy Don Technical University, Hanoi 11917, Vietnam
4
Wireless Communications Research Group, Faculty of Electrical and Electronics Engineering, Ton Duc Thang University, Ho Chi Minh City 72912, Vietnam
5
Department of Telecommunications, Posts and Telecommunications Institute of Technology, Ho Chi Minh City 71007, Vietnam
*
Author to whom correspondence should be addressed.
Received: 2 January 2019 / Revised: 13 February 2019 / Accepted: 20 February 2019 / Published: 24 February 2019
(This article belongs to the Section Information Theory, Probability and Statistics)
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Abstract

In this paper, we consider a cooperative multi-hop secured transmission protocol to underlay cognitive radio networks. In the proposed protocol, a secondary source attempts to transmit its data to a secondary destination with the assistance of multiple secondary relays. In addition, there exists a secondary eavesdropper who tries to overhear the source data. Under a maximum interference level required by a primary user, the secondary source and relay nodes must adjust their transmit power. We first formulate effective signal-to-interference-plus-noise ratio (SINR) as well as secrecy capacity under the constraints of the maximum transmit power, the interference threshold and the hardware impairment level. Furthermore, when the hardware impairment level is relaxed, we derive exact and asymptotic expressions of end-to-end secrecy outage probability over Rayleigh fading channels by using the recursive method. The derived expressions were verified by simulations, in which the proposed scheme outperformed the conventional multi-hop direct transmission protocol. View Full-Text
Keywords: physical-layer security; underlay cognitive radio; cooperative multi-hop transmission; secrecy outage probability; hardware impairments physical-layer security; underlay cognitive radio; cooperative multi-hop transmission; secrecy outage probability; hardware impairments
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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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Tran Tin, P.; The Hung, D.; Nguyen, T.N.; Duy, T.T.; Voznak, M. Secrecy Performance Enhancement for Underlay Cognitive Radio Networks Employing Cooperative Multi-Hop Transmission with and without Presence of Hardware Impairments. Entropy 2019, 21, 217.

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