On the Optimization of Relays in the Opportunistic Relaying for Enhancing Security in Wireless Multicasting Through κ-µ Shadowed Fading
A. H. M. Zahirul Alam, M. Z. I. Sarkar, M. R. A. Ruku, Kamrul Islam, K. M. M. Rahman · 2023
In wireless networks, opportunistic relaying is a valuable technique that enhances transmission efficiency by selectively activating specific relays with the highest Signal-to-Noise Ratios (SNRs) to aid in data distribution. This approach minimizes synchronization requirements, offers cooperative diversity, and promises low complexity. Various relay selection algorithms have been proposed to identify the best relay for a given transmission scenario. Opportunistic relaying optimally suits scenarios involving generalized κ−µ shadowed fading channels. These channels are characterized by the effect of fluctuation parameters, scatterers and propagation clusters, which significantly impact performance. In this paper, it is investigated the application of opportunistic relaying to secure wireless multicasting in the presence of multiple eavesdroppers over generalized κ−µ shadowed fading channels. The primary objective is to bolster the security of multicasting, compensating for security loss caused by factors such as imbalances between dominant waves power and scattered waves power, κ, fluctuation parameters, m, of propagation clusters number, µ, number of receivers, M, and number of eavesdroppers, N. The closed form analytical expressions of Probability of Non-Zero Secrecy Multicast Capacity (PNZSMC) and Secure Outage Probability for Multicasting (SOPM) are derived to gain insights into the impact of these parameters. The result demonstrated that opportunistic relaying significantly enhances security in multicasting over κ−µ shadowed fading channels, effectively mitigating the effects of above aforementioned parameters.