Enhancing multicast security of cognitive radio networks with antenna correlations over Nakagami- m fading channels
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Enhancing multicast security of cognitive radio networks with antenna correlations over Nakagami-m fading channels Rezwana Sultana1 • Md. Zahurul Islam Sarkar1 • Md. Selim Hossain1 • Dilip Kumar Sarker1 Accepted: 28 October 2020 Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract In this paper, we investigate the impact of diversity and antenna correlations on the secrecy capacity and outage performance of a cognitive radio multicast network over Nakagami-m fading channels analytically. The proposed network consists of single primary and secondary user, multiple primary and secondary receivers, and multiple eavesdroppers. It is assumed that each user is equipped with single antenna while all the primary and secondary receivers, and eavesdroppers are equipped with multiple antennas. The primary and secondary users transmit their common messages to the respective receivers in the presence of multiple eavesdroppers. A mathematical model is developed to ensure successful reception of confidential information to the primary receivers protecting the activities of eavesdroppers neglecting the effect of interference due to secondary user. In order to analyze the security of the proposed model, closed-form analytical expressions have been derived for the secrecy multicast capacity, the secure outage probability for multicasting and the probability of non-zero secrecy multicast capacity. Analytical results are justified via Monte-Carlo simulations. Keywords Antenna correlations Cognitive radio network Ergodic secrecy multicast capacity Nakagami-m fading Probability of non-zero secrecy multicast capacity Secure outage probability
1 Introduction In modern communication world, researchers have shown their great interests on the study of cognitive radio networks (CRNs) [1–4] due to the fact that cognitive radio can able to detect automatically the best communication link in wireless channels by dynamic spectrum management. For this opportunistic behavior of CRN it can be efficiently utilized in wireless multicasting to overcome the problem of capacity degradation with the addition of new users to & Rezwana Sultana [email protected] Md. Zahurul Islam Sarkar [email protected] Md. Selim Hossain [email protected] Dilip Kumar Sarker [email protected] 1
Department of Electrical and Electronic Engineering, Rajshahi University of Engineering and Technology, Rajshahi 6204, Bangladesh
the system. But CRN suffers from an undesirable drawback of performance degradation due to antenna correlations [1, 2, 5], because more often these networks are spread with increasing number of closely-spaced multiple antennas. On the other hand, the issues of security is more essential for multicast networks [6, 7], as these networks are frequently used to transmit confidential and personal information. A multi-antenna CRN was modeled with constant and exponential correlations in [2] deriving the expression of energy detection probability and showed that although a
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