Abstract
This paper selects an unlicensed relay among available self‐powered relays to not only remain but also secure information transmission from an unlicensed source to an unlicensed destination. The relays harvest energy in signals of the unlicensed source and the licensed transmitter. Then, they spend the harvested energy for their relaying operation. Conditioned on the licensed outage restriction, the peak transmission power restriction, Rayleigh fading, and the licensed interference, the current paper proposes an exact closed‐form formula of the secrecy outage probability to quickly evaluate the secrecy performance of the proposed relay selection method in cognitive radio networks with energy harvesting. The proposed formula is corroborated by computer simulations. Several results illustrate the effectiveness of the relay selection in securing information transmission. Additionally, the security capability is saturated at large peak transmission powers or large preset outage probabilities of licensed users. Furthermore, the security capability depends on many specifications among which the power splitting ratio, the relays’ positions, and the time switching ratio can be optimally selected to obtain the best security performance.
Highlights
In cognitive radio networks, unlicensed users are supported to use opportunistically the allotted frequencies of licensed users to improve significantly the spectrum utilization efficiency, which is currently low [1]
Converting unexpected signals to advantageous energy sources is valuable and this distinguishes [34, 36] where the energy in the licensed interference is not harvested at relays (v) The power splitting based energy harvesting method is employed in this paper while [34] uses the time switching based energy harvesting method (vi) Our work suggests the precise closed-form secrecy outage probability (SOP) analysis that distinguishes [34] where merely simulation results were provided and [36] where the intercept outage probability (IOP) was analyzed
The SOP reduces with the increase in the number of relays
Summary
In cognitive radio networks, unlicensed users are supported to use opportunistically the allotted frequencies of licensed users to improve significantly the spectrum utilization efficiency, which is currently low [1]. Converting unexpected signals to advantageous energy sources is valuable and this distinguishes [34, 36] where the energy in the licensed interference is not harvested at relays (v) The power splitting based energy harvesting method is employed in this paper while [34] uses the time switching based energy harvesting method (vi) Our work suggests the precise closed-form SOP analysis that distinguishes [34] where merely simulation results were provided and [36] where the intercept outage probability (IOP) was analyzed. Part 4 shows analytical/simulated results, and Part 5 closes our work
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
