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Transactions on Emerging Telecommunications Technologies

Secure 5G Coordinating Spectrum Sharing System With Cooperation Transmitter and Receiver Pairs

Ayat M. Alrjoob, Ahmad Ababnah, Mamoun F. Al‐Mistarihi

Published Mar 1, 2025• 2 citations
Publisher

Abstract

ABSTRACT In this paper, we propose a 6‐node system consisting of two transmitter‐receiver pairs sharing the same spectrum, an eavesdropper, and a relay, all operating in a half‐duplex. The eavesdropper is mainly interested in communication between one of the transmitter‐receiver pairs, which we call the primary. Communication along with the second pair called the secondary, is performed in two hops/time slots with the aid of the relay. The main idea of our study is to investigate the secrecy performance of the primary pair when jamming is performed by the secondary relay‐assisted path. In particular, in the first time slot, the secondary destination acts as a jammer relative to the eavesdropper by injecting artificial noise known to the primary pair. During the second time slot, the secondary transmitter acts as a jammer while the relay forwards data to the secondary destination. In effect, this allows for cooperation among the nodes both in transmitting primary and secondary data while reducing the eavesdropper's ability to listen in on the primary link communication. For the proposed protocol, we derive closed‐form expressions of the intercept probability. We also obtain a closed‐form expression of the outage probability along with the secondary communication link. Moreover, we study the effect of transmit power allocation on intercept and outage probabilities along with the different links. Theoretical and simulation results are given to prove that the proposed protocol can provide better security for the primary link and acquire acceptable secondary outage probability.

DOI
10.1002/ett.70080

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ABSTRACT In this paper, we propose a 6‐node system consisting of two transmitter‐receiver pairs sharing the same spectrum, an eavesdropper, and a relay, all operating in a half‐duplex. The eavesdropper is mainly interested in communication between one of the transmitter‐receiver pairs, which we call the primary. Communication along with the second pair called the secondary, is performed in two hops/time slots with the aid of the relay. The main idea of our study is to investigate the secrecy performance of the primary pair when jamming is performed by the secondary relay‐assisted path. In particular, in the first time slot, the secondary destination acts as a jammer relative to the eavesdropper by injecting artificial noise known to the primary pair. During the second time slot, the secondary transmitter acts as a jammer while the relay forwards data to the secondary destination. In effect, this allows for cooperation among the nodes both in transmitting primary and secondary data while reducing the eavesdropper's ability to listen in on the primary link communication. For the proposed protocol, we derive closed‐form expressions of the intercept probability. We also obtain a closed‐form expression of the outage probability along with the secondary communication link. Moreover, we study the effect of transmit power allocation on intercept and outage probabilities along with the different links. Theoretical and simulation results are given to prove that the proposed protocol can provide better security for the primary link and acquire acceptable secondary outage probability.
Security and energy are two critical Issues for emerging wireless networks and thus we study wireless energy harvesting and physical-layer security for a spectrum-sharing network with a multi-antenna full-duplex secondary receiver in the presence of an eavesdropper. We adopt a time-switching strategy where in the first phase, secondary users are powered through wireless energy transfer from the primary source. In the second phase, the secondary transmitter and receiver use the harvested energy to transmit the information and jamming signal, respectively. We propose a beamforming scheme at the secondary receiver with the main purpose of minimizing the outage probability of the secondary data transmission and maximizing the achievable secrecy rate of the primary system. We derive analytical expression for the outage probability at the secondary receiver and the achievable secrecy rate of the primary network. Moreover, asymptotic closed-form outage probability is presented. Numerical simulations verify the performance of the proposed scheme and analytical results and allow us to investigate the impact of the key system parameters on the network performance.
In this study, the authors investigate the secure transmission of a cooperative network, in which a source communicates with a destination via multiple cooperative nodes in the presence of a full‐duplex active eavesdropper, which can intercept the confidential signals and transmit jamming signals simultaneously. To safeguard the security of legitimate communication, two joint relay and jammer selection schemes are proposed according to the availability of the eavesdropper's channel state information, namely, optimal relay and random jammer selection scheme and optimal relay and optimal jammer selection scheme. The authors first derive the exact closed‐form expressions of the secrecy outage probability (SOP) for different selection schemes. Aiming at minimising SOP, they then adopt the deep feedforward neural network to determine the optimal power allocation between the selected relay and jammer. Further, the asymptotic expressions for SOP in the high signal‐to‐noise ratio regime are derived. Numerical results verify the analysis and demonstrate the performance advantage of the proposed scheme over conventional relay selection scheme with optimal power allocation.
We investigate the spectrum sharing possibility as an incentive to enhance the physical layer security. The concept behind is that a legitimate source-destination pair, communicating in the presence of a passive eavesdropper, stimulates the help of another source-destination nodes looking for transmission opportunities, referred to as secondary network (SN). We thus propose a cooperative scheme, whereby the secondary transmitter (ST) will act as a friendly jammer to confound the eavesdropper and be granted to share the spectrum of the legitimate pair, referred to as primary network (PN), as a reward. Meanwhile, the ST has to secure its own secrecy communication and thus exploit the impact of the induced interference by the PN. To evaluate the performance of our cooperative scheme, we derive the closed-form expressions of the secrecy outage probability (SOP) for both cooperative networks. However, to assess its usefulness, we introduce the mutual outage probability (MOP) and we carry out analysis to derive its expression. We show that a satisfactory SOP is a necessary condition for triggering the cooperation, whereas a satisfactory MOP is a sufficient condition to guarantee that the PN-SN collaboration leads to a win-win situation. Furthermore, an asymptotic analysis is also carried out to derive the generalized secrecy diversity for the scheme under investigation, where it has been shown that the primary system achieves its full secrecy diversity order, equal to the number of antenna at the primary transmitter. Such results present useful insights for practical design and setups.
In this paper, we investigate the secure communication of cognitive full-duplex relay networks in the presence of multiple eavesdroppers and multiple primary receivers. In the considered network, multiple full-duplex relays are deployed to transfer information in the secondary network, under the malicious attempts of non- colluding/colluding eavesdroppers. Meanwhile, the transmit powers of secondary transmitters are constrained by the quality-of-service of the primary network. The optimal relay selection scheme is proposed to enhance the secrecy performance of the considered system. We study the secrecy performance by providing the exact closed- form and asymptotic expressions of the proposed system secrecy outage probability. We have demonstrated that increasing the number of full- duplex relays can improve the security performance. At the illegitimate side, using colluding eavesdroppers and increasing the number of eavesdroppers put information confidentiality at a greater risk. Besides, the transmit power and the desired outage probability of the primary network have great influences on the secrecy outage probability of the secondary network.
In this paper, we study the physical layer security for underlay cognitive radio network in the presence of an eavesdropper that tries to intercept the secondary transmission. Specifically, a transmission at each hop uses a same frequency band of a primary user as long as the interference that caused by the secondary transmission at a primary receiver does not excess a maximum tolerable interference level. We investigate the secrecy outage probability (SOP) for a cognitive decode-and-forward (DF) relay network. Moreover, we drive a closed-form expression of the SOP of the considered system. Simulation results validate our theoretical results under three distinct cases as follows: the signal-to-noise ratio (SNR) of the main link between a secondary transmitter and a corresponding receiver is, respectively, smaller, equal to, or larger than the SNR of the eavesdropper link between the same secondary transmitter and the eavesdropper.
We investigate the spectrum sharing possibility as an incentive to enhancing the physical layer security. The concept behind this is that a legitimate source-destination pair, communicating in the presence of a passive eavesdropper, stimulates the help of another source-destination node looking for transmission opportunities, referred to as secondary network (SN). We thus propose a cooperative scheme, whereby the secondary transmitter will act as a friendly jammer to confound the eavesdropper and be granted to share the spectrum of the legitimate pair, referred to as primary network (PN), as a reward. To evaluate the performance of our cooperative scheme, we derive the closed-form expression of the secrecy outage probability (SOP). However, to assess its usefulness, we introduce the mutual outage probability (MOP) and we carry out analysis to derive its expression. We show that a satisfactory SOP is a necessary condition for triggering the cooperation, whereas a satisfactory MOP is a sufficient condition to guarantee that the PN-SN collaboration leads to a win-win situation. Results have been presented considering outdated channel state information, thus giving more insights for practical setups.