Security Analysis in Multicasting over Shadowed Rician and {\alpha}-{\mu} Fading Channels: A Dual-hop Hybrid Satellite Terrestrial Relaying Network

TL;DR

This paper analyzes the secrecy performance of a hybrid satellite-terrestrial multicasting network under shadowed Rician and alpha-mu fading, deriving closed-form expressions and exploring trade-offs to maintain security against eavesdroppers.

Contribution

It introduces a comprehensive secrecy analysis for a dual-hop HST relaying network with specific fading models, providing new closed-form expressions and insights into security trade-offs.

Findings

Secrecy capacity can be maintained despite harsh fading conditions.

Derived closed-form expressions for secrecy metrics.

Trade-offs identified between relays, users, and eavesdroppers.

Abstract

In this era of 5G technology, the ever-increasing demands for high data rates lead researchers to develop hybrid satellite-terrestrial (HST) networks as a substitution to the conventional cellular terrestrial systems. Since an HST network suffers from a masking effect which can be mitigated by adopting the terrestrial relaying strategy, in this work, we focus on wireless multicasting through an HST relaying net-work (HSTRN) in which a satellite sends messages to multiple terrestrial nodes via multiple relays under the wiretapping efforts of multiple eavesdroppers. Our concern is to protect the multicast messages from being eavesdropped taking advantage of the well-known opportunistic relaying technique. We consider the satellite links follow Shadowed Rician fading whereas the terrestrial links undergo alpha-mu fading. The secrecy performance of the proposed HSTRN model is accomplished by deriving expressions for the probability of nonzero secrecy multicast capacity, ergodic secrecy multicast capacity, and secure outage probability for multicasting in closed-form. Capitalizing on the derived expressions, we analyze how a perfect secrecy level can be preserved in spite of harsh channel conditions and also present a secrecy trade-off in terms of the number of relays, multicast users, and multiple eavesdroppers. Finally, the numerical analyses are corroborated via Monte-Carlo simulations.