Comprehensive framework for physical layer analysis over generalized-lognormal composite fading channels

Abstract

Physical layer security (PLS) has emerged as an effective technique for safeguarding wireless communications against eavesdropping by exploiting the inherent randomness of wireless channels. While PLS performance has been widely studied under generalized fading models, its behavior in composite fading environments that simultaneously account for non-linear multipath fading and lognormal shadowing remains largely unexplored. Motivated by this gap, this paper investigates the secrecy performance of wireless links operating over ? - ? - ? /Lognormal and ? - ? - ? /Lognormal composite fading channels. Closed-form expressions are derived for key secrecy metrics, including the average secrecy capacity (ASC), a lower bound on the secrecy outage probability (SOP L ), and the probability of strictly positive secrecy capacity (SPSC). Furthermore, high-SNR asymptotic analyses are provided to offer valuable analytical insights. The proposed framework considers arbitrary and independent fading conditions for the main and eavesdropper channels, and the analytical results are corroborated through Monte Carlo simulations. � 2026 Elsevier Inc.