Physical Layer Security Performance of Pinching-Antenna Systems With In-Waveguide Attenuation

TL;DR

This paper evaluates the physical-layer security of pinching-antenna systems considering realistic waveguide attenuation, deriving bounds on secrecy metrics and showing performance improvements over fixed antennas.

Contribution

It introduces a waveguide attenuation model for pinching-antenna systems and derives bounds on secrecy outage probability and ergodic secrecy capacity.

Findings

PA systems outperform fixed-antenna systems in security metrics

Derived closed-form bounds on SOP and ESC under realistic attenuation

Waveguide attenuation significantly impacts PLS performance

Abstract

Pinching antenna (PA) systems have recently gained significant attention. While their physical-layer security (PLS) is being explored, most studies rely on idealized lossless models, ignoring practical waveguide attenuation. In this paper, we investigate the PLS performance of PA systems under a more realistic attenuation-incorporated waveguide model. Specifically, we investigate a PA system-based secure communication scenario consisting of a base station (BS), a legitimate user, and a passive eavesdropper. We derive expressions for closed-form upper and lower bounds on both the secrecy outage probability (SOP) and ergodic secrecy capacity (ESC). The results indicate that the PA system outperforms conventional fixed-antenna systems.