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Transactions on Emerging Telecommunications Technologies

Secrecy outage probability in energy harvesting aided underlay cognitive radio network under eavesdroppers scenarios

Kehinde Oluwasesan Odeyemi, Pius Adewale Owolawi, Oladayo Olufemi Olakanmi

Published Jul 13, 2020• 7 citations
Publisher

Abstract

Abstract In this paper, the secrecy outage probability (SOP) of an energy harvesting aided underlay single input multiple output cognitive radio network under the multiple eavesdroppers is investigated. It is assumed that all the channels within the network are subjected to Nakagami‐m distributions. In order to quantify the secrecy performance of the concerned network, two eavesdroppers' scenarios are considered and this includes: Colluding Eavesdropping and noncolluding Eavesdropping. Based on these, the SOP closed‐form expressions are derived for the network under the two scenarios. Our findings illustrate that the network under the noncolluding eavesdropping scenario achieve better secrecy outage performance compared with colluding eavesdropping mode. Furthermore, the impact of number of eavesdroppers Ne, the number of antennas equipped at eavesdroppers Ae as well as fading parameter of the wiretap channel me on the network secrecy outage performance are demonstrated. Finally, the accuracy of the derived expressions is validated through the Monte‐Carlo simulations.

DOI
10.1002/ett.4041

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IET Communications•Jun 12, 2017•18 citations
Abstract In this paper, the secrecy outage probability (SOP) of an energy harvesting aided underlay single input multiple output cognitive radio network under the multiple eavesdroppers is investigated. It is assumed that all the channels within the network are subjected to Nakagami‐m distributions. In order to quantify the secrecy performance of the concerned network, two eavesdroppers' scenarios are considered and this includes: Colluding Eavesdropping and noncolluding Eavesdropping. Based on these, the SOP closed‐form expressions are derived for the network under the two scenarios. Our findings illustrate that the network under the noncolluding eavesdropping scenario achieve better secrecy outage performance compared with colluding eavesdropping mode. Furthermore, the impact of number of eavesdroppers Ne, the number of antennas equipped at eavesdroppers Ae as well as fading parameter of the wiretap channel me on the network secrecy outage performance are demonstrated. Finally, the accuracy of the derived expressions is validated through the Monte‐Carlo simulations.
Abstract In this work, the physical layer security performance of an underlay cognitive buffer‐aided relay network over the general Nakagami‐ m fading channel model is addressed, where a primary source communicates with a destination via a decode‐and‐forward relay node in the presence of an eavesdropper and a secondary communication system. The relay is equipped with a finite‐size storage equipment or buffer which can store the sequence of received data packets from source and forward it immediately or subsequently in an adequate time‐slot. In this way, the buffer relay enables to adopt a link selection scheme in order to detect the best available link, (i.e. the one with higher secrecy rate) among the available data at source or at the relay buffer. The closed‐form expression for the secrecy outage probability (SOP), which is a widely adopted performance metric in the considered scenario, is also derived. Numerical results confirm the accuracy of the derived closed‐form analytic expression for SOP and indicates the interaction between secrecy performance and the Nakagami channel parameter m . In particular, it is shown that the SOP experiences a significant drop as the Nakagami channel parameter increases for a predefined target secrecy rate.
Secure data transmission in future high-capacity high-coverage multi-tier hierarchical networks, for which cognitive radio(CR) has emerged as an essential recipe, is of utmost importance. This paper investigates the secrecy outage performance of selection combining(SC) in CR networks(CRNs) over Rayleigh fading channels. In a single-input multiple-output(SIMO) wiretap channel, a secondary user transmits confidential messages to another secondary user, which is equipped with( 1)B Bn n ≥ antennas. Meanwhile, a passive eavesdropper, which is equipped with( 1)E En n ≥ antennas, intends to overhear the messages. Both the legal receiver and the eavesdropper adopt SC scheme to process the received multiple signals. The secondary transmitter uses the underlay strategy to guarantee the quality of service of the primary user without spectrum sensing. Compared to the work proposed by Maged Elkashlan et al. in Ref. [1], we present an alternative method to derive the closed-form expression for the secrecy outage probability(SOP) and develop a simplified SOP when the maximal transmit power at the secondary user is sufficiently high. Our results reveal the impact of the primary network on the secondary network with a multi-antenna wiretap channel and simulations are conducted to validate the accuracy of our proposed analytical models.
This paper investigates the secrecy performance of a single-input multiple-output (SIMO) based underlay cognitive radio networks. In particular, a single-antenna secondary transmitter transmits its secret message to a multi-antenna equipped secondary node in the presence of a multi-antenna equipped passive eavesdropper under a peak interference constraint at the single-antenna primary receiver. We proficiently derive the expressions for secrecy outage probability (SOP), intercept probability, and ergodic secrecy capacity (ESC) for the considered system over$\alpha -\mu fadingchannels.Further,wecarryouttheasymptoticanalysisofSOPandinterceptprobabilityundertwocasesofinterest;1)whentheaveragesignal−to−noiseratio(SNR)ofthemainlink,i.e.,betweenthesecondarysourceandsecondarydestination,goestoinfinitywithafixedaverageSNRofwiretaplinkbetweenthesecondarysourceandsecondaryeavesdropper,and2)whentheSNRsofboththemainandwiretaplinkstendtoinfinity.Wecaninferthatasecrecydiversityorderoffading channels. Further, we carry out the asymptotic analysis of SOP and intercept probability under two cases of interest; 1) when the average signal-to-noise ratio (SNR) of the main link, i.e., between the secondary source and secondary destination, goes to infinity with a fixed average SNR of wiretap link between the secondary source and secondary eavesdropper, and 2) when the SNRs of both the main and wiretap links tend to infinity. We can infer that a secrecy diversity order offadingchannels.Further,wecarryouttheasymptoticanalysisofSOPandinterceptprobabilityundertwocasesofinterest;1)whentheaveragesignal−to−noiseratio(SNR)ofthemainlink,i.e.,betweenthesecondarysourceandsecondarydestination,goestoinfinitywithafixedaverageSNRofwiretaplinkbetweenthesecondarysourceandsecondaryeavesdropper,and2)whentheSNRsofboththemainandwiretaplinkstendtoinfinity.Wecaninferthatasecrecydiversityorderof\frac {\alpha _{D}N_{D}\mu _{D}}{2}canbeachievedundercase1,wherecan be achieved under case 1, wherecanbeachievedundercase1,where\alpha _{D}andandand\mu _{D}arethemainlinkfadingparameters,andare the main link fading parameters, andarethemainlinkfadingparameters,andN_{D}$denotes the number of antennas at the destination. Whereas, under case 2, the system’s secrecy diversity order becomes zero. Moreover, we also present some interesting findings for the ESC when the interference constrained secondary transmitter power is considerably high. Further, we validate our analytical framework through extensive simulation and numerical results, and demonstrate the effects of system/channel parameters on the secrecy performance of the considered system. Our results reveal that the higher number of eavesdropper antennas can have a more deleterious impact on the system’s secrecy performance.
A cognitive wiretap channel is considered with underlay spectrum sharing and multiple primary users. The secondary transmitter communicates with a secondary receiver in the presence of multiple eavesdroppers. The secondary transmitter, the secondary receiver are equipped with multiple antennas, whereas and each eavesdropper is equipped with a single antenna. Secrecy performance of the cognitive wiretap channel is analyzed. Transmit antenna selection (TAS) scheme is implemented to enhance the security in communication. The closed form expression for the secrecy outage probability is derived and the results are validated by carrying out simulations. The impact of multiple primary users in the cognitive wiretap network's secrecy performance is revealed in the results.
In this paper, the physical layer security in cognitive radio networks (CRNs) is investigated. We consider an underlay relay assisted CRN consisting of multiple secondary sources, multiple-antenna destination, a single relay, and multiple eavesdroppers. The destination node performs the maximal-ratio combining under uncorrelated Rayleigh fading channels. In more details, we consider, a secondary source is randomly selected to transmit its data, and a jammer is chosen from the remaining source nodes to send a jamming signal to the eavesdroppers. The closed-form expression of the secrecy outage probability is derived, based on the statistical characteristics of the communication channels, under the primary user's quality of service constraint. The derived analysis gives deep insights into the impact of network parameters on the performance of on the secrecy outage performance. Analytic results are corroborated through Monte Carlo simulation.
This study investigates the secrecy outage performance of a single‐input multiple‐output underlay cognitive radio network (CRN) with outdated channel state information (CSI). The confidential messages are transmitted from transmitter to the destination, while a multi‐antenna eavesdropper exists. The maximal ratio combining and selection combining schemes are utilised at the receivers to improve the quality of the received signal‐to‐noise ratio. The exact and asymptotic closed‐form expressions of secrecy outage probability are derived, and simulation results are provided to verify the authors' proposed analytical results. The results reveal that imperfect CSI of main channels deteriorates the secrecy outage performance while that of eavesdropping and interfering channels has contrary effect, and only a unity diversity order can be obtained in underlay CRNs with imperfect CSI.