Ergodic Secrecy Rate Analysis for LEO Satellite Downlink Networks

TL;DR

This paper analyzes the secrecy performance of LEO satellite downlink networks by deriving an analytical expression for ergodic secrecy rate, considering spatial distributions and network parameters, and validates findings through simulations.

Contribution

It introduces a novel analytical framework for secrecy rate analysis in LEO satellite networks using stochastic geometry modeling.

Findings

Optimal satellite altitude increases with eavesdropper density

Analytical expressions accurately predict secrecy performance

Secrecy rate depends on satellite altitude, eavesdropper density, and network parameters

Abstract

Satellite networks are recognized as an effective solution to ensure seamless connectivity worldwide, catering to a diverse range of applications. However, the broad coverage and broadcasting nature of satellite networks also expose them to security challenges. Despite these challenges, there is a lack of analytical understanding addressing the secrecy performance of these networks. This paper presents a secrecy rate analysis for downlink low Earth orbit (LEO) satellite networks by modeling the spatial distribution of satellites, users, and potential eavesdroppers as homogeneous Poisson point processes on concentric spheres. Specifically, we provide an analytical expression for the ergodic secrecy rate of a typical downlink user in terms of the satellite network parameters, fading parameters, and path-loss exponent. Simulation results show the exactness of the provided expressions and we find that optimal satellite altitude increases with eavesdropper density.