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

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 s...

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Bibliographic Details
Published in:Entropy (Basel, Switzerland) Switzerland), 2019-02, Vol.21 (2), p.217
Main Authors: Tran Tin, Phu, The Hung, Dang, Nguyen, Tan N, Duy, Tran Trung, Voznak, Miroslav
Format: Article
Language:English
Subjects:
Cognitive radio
cooperative multi-hop transmission
Data transmission
Hardware
hardware impairments
Impairment
Interference
physical-layer security
Protocol
Random variables
Receivers & amplifiers
Recursive methods
secrecy outage probability
Transmitters
underlay cognitive radio
Wireless communications
Wireless networks
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Summary: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.
ISSN:1099-4300
1099-4300
DOI:10.3390/e21020217