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AEU - International Journal of Electronics and Communications

Secrecy performance comparison of diversity combining techniques in wireless multicast networks

Rezwana Sultana, Md. Rokonuzzaman Mim, A.S.M. Faysal Ahmed, Md. Arifuzzaman, Partho Kumer Nonda

Published Mar 14, 2026• 0 citations
Publisher
DOI
10.1016/j.aeue.2026.156301

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The effect of correlated fading reduces the performance gain in multi-antenna communications. Diversity combining is a well-known technique to reduce the effect of correlation. But still, it is an open problem to quantify as the diversity scheme is more efficient in enhancing the security of cellular multicast network mitigating the effects of correlation. Motivated by this issue, this paper considers a secure wireless multicasting scenario through correlated cellular networks in the presence of multiple eavesdroppers. The selection combining (SC) and switch and stay combining (SSC) techniques are considered in dual arbitrarily correlated Nakagami-m fading channels. The closed-form analytical expressions for the probability of non-zero secrecy multicast capacity and the secure outage probability for multicasting are derived to understand the insight into the effects of correlation on the SC and SSC diversity schemes and to quantify which diversity scheme is more efficient in enhancing the security of correlated multicast networks. The results show that, although the diversity gain reduces the effect of correlation, the diversity gain provided by the SC diversity scheme is more significant in mitigating the effect of correlation compared to the SSC diversity scheme. Due to the selection mechanism of SC diversity, it is more sensitive to the change of SNR of the eavesdropper’s channel compared to the case of the SSC diversity scheme.
This paper focuses on a secure wireless multicas-ting under the employment of generalized receiver along with maximal ratio combining (MRC) diversity technique. MRC diversity technique mitigate the fading effect significantly and the generalized receiver is flexible to adaptive signal processing. In this paper, the transmitted signal has been protected from eavesdropping considering the effect of receive side antenna number, eavesdropper side antenna number, multicast user number and eavesdropper number. In this manner the authors derived the closed form analytical expression for the probability of non-zero secrecy capacity of multicast system (PNSMC) and for the secure outage probability of multicast system (SOPM) to ensure the secrecy in the presence of multiple eavesdroppers. These mathematical models are helpful to realize the insight of the effects of aforementioned parameters. The numerical results show that, security in multicast network employing generalized receiver with MRC diversity technique is significantly affected by the number of receive antenna, eavesdropper antenna, multicast user and eavesdropper, specially at low noise power region of eavesdropper.