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IEEE International Conference on Advanced Networks and Telecommunications Systems

Secrecy performance Analysis for Underlay Cognitive Radio Network with Optimal Antenna Selection and Generalized Receiver Selection

Shilpa Thakur, Ajay Singh

Published Dec 1, 2019• 1 citation
Publisher

Abstract

We have examined the physical layer security of an underlay cognitive radio network (CRN) consisting of L legitimate receivers ( STX), a secondary transmitter ( STX), an eavesdropper (Eve), and a primary user (PU). All SRX and the PU are equipped with a single antenna while the STX and Eve are implemented with multiple antennas. The optimal antenna selection scheme (OAS) is adopted at the STX, which maximizes the secrecy capacity while a generalized receiver selection scheme is adopted at the SRX. The STX sends information to the SRX with the lthbest signal to noise ratio (SNR). The concise expressions for exact and asymptotic secrecy outage probability (SOP) for an arbitrary number of SRX, number of transmit antenna NA, and number of eavesdropper antenna NE have derived.

DOI
10.1109/ants47819.2019.9118069

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We have examined the physical layer security of an underlay cognitive radio network (CRN) consisting of L legitimate receivers ( STX), a secondary transmitter ( STX), an eavesdropper (Eve), and a primary user (PU). All SRX and the PU are equipped with a single antenna while the STX and Eve are implemented with multiple antennas. The optimal antenna selection scheme (OAS) is adopted at the STX, which maximizes the secrecy capacity while a generalized receiver selection scheme is adopted at the SRX. The STX sends information to the SRX with the lthbest signal to noise ratio (SNR). The concise expressions for exact and asymptotic secrecy outage probability (SOP) for an arbitrary number of SRX, number of transmit antenna NA, and number of eavesdropper antenna NE have derived.
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.
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 work explores the physical layer security of an underlay cognitive radio network (CRN) in the presence of a powerful interferer called a primary transmitter (PT) under peak interference power constraint. Under this scenario, the secondary transmitter (Alice) transmits secret information on a single antenna with the highest signal-to-interference plus noise ratio (SINR) to a legitimate receiver (Bob), and an eavesdropper (Eve) attempts to intercept that information. Depending upon the availability of channel state information (CSI) of the eavesdropper channel, we investigate the secrecy performance of the proposed network in the Rayleigh fading environment for both passive and active eavesdropping scenarios. We obtain analytical expressions for the secrecy outage probability, intercept probability, andϵ\epsilonϵ-outage secrecy capacity in a passive eavesdropping scenario. A complete investigation of the average secrecy capacity (ASC) has been made, and novel expressions for the exact and asymptotic ASC have been obtained for active eavesdropping. Bolstering these results, we also define a high SINR power offset, which quantifies the significance of main system parameters on the ASC explicitly. Further, the effect of outdated CSI of Alice to primary receiver link on the various performance metrics with the concept of interference-outage is also studied.
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 study, the physical layer security for cognitive radio network (CRN) will be investigated in which a secondary user transmitter (SU-Tx) sends confidential information to a SU receiver (SU-Rx) on the same frequency band of a primary user (PU) in the presence of an eavesdropper receiver. Moreover, relay selection scheme is proposed for the security constrained CRNs with single eavesdropper, multiple eavesdroppers and PUs. The proposed scheme selects a trusted decode and forward relay to assist the SU-Tx and maximise the achievable secrecy rate that is subjected to the interference power constraints at the PUs for the different number of eavesdroppers and PUs under available channel knowledge. The SU cooperates with relays only when a high secrecy rate is achieved. Secrecy rate and secrecy outage probability are the two performance metrics that are used to verify the effectiveness of the proposed scheme although asymptotic approximations of the secrecy outage probability are also derived. Simulation and analytical results demonstrate that the performance improvement of the proposed scheme reaches to the double relative to the conventional scheme for the secrecy capacity.
In this paper, we investigate the secrecy outage probability (SOP) for the cooperative decode-and-forward (DF) underlay cognitive radio networks (CRNs). Duo to the spectrum sharing approach in underlay CRNs, the secondary transmitters (secondary source (SUS) and secondary relay (SUR)) are subjected to interference power constraint at primary user (PU), and the SU receivers (SURand secondary destination (SUD)) suffer from the co-channel interferences (CCIs) from PU. We focus on the practical scenario where the SU transmitter has no channel state information (CSI) of the eavesdropper's channel. Interference-power-confined selection scheme is proposed for the cooperative DF CRNs in the presence of an eavesdropper. The proposed scheme selects the “best” terminal (SUSor SUR) to enhance the secure performance which must firstly satisfy the interference power constraint. What's more, the effect of feedback delay on the selection scheme is studied. We derive an exact closed-form expression for the SOP. Simulation results validate our theoretical analysis and show that the proposed selection scheme determinately enhance the performance, and feedback delay decreases the SOP seriously, specially, the interference power constraint hugely confine the SOP.