Physical-Layer Security of Pinching-Antenna Systems

2025-03-24

AI Summary

This work investigates the physical-layer security of a single-antenna system in lossless dielectric waveguides, considering a base station-to-single-antenna legitimate user link under eavesdropping by a single-antenna adversary. We propose a unified analytical framework integrating electromagnetic field modeling with stochastic geometry, enabling the first derivation of closed-form expressions for the average secrecy capacity, the probability of strictly positive secrecy capacity, and the secrecy outage probability under waveguide channel conditions—validated via Monte Carlo simulations. Key findings reveal that antenna height and placement critically impact security: deploying the antenna closer to the legitimate user enhances average secrecy capacity, while increasing the eavesdropper’s distance leads to a sharp decline in secrecy outage probability. This study establishes a tractable, quantitative theoretical foundation and provides concrete design guidelines for securing waveguide-based communication systems.

Technology Category

• Search and Optimization: Evaluation and Analysis
• Planning, Routing, and Scheduling: Optimization of Spatio-temporal Systems
• Application Domains: Security

Application Category

• Security and Privacy: Large-scale security measurements
• Systems and Infrastructure for Web, Mobile and WoT: Web performance, measurement, and characterization
• User Modeling, Personalization and Recommendation: User privacy protection in personalized systems

Abstract

In this paper, we investigate the performance of physical-layer security of a pinching-antenna system on a lossless dielectric waveguide. In particular, the system uses a single pinching-antenna to convey confidential information from a base station to a legitimate destination equipped with a single antenna, while an eavesdropper, also equipped with a single antenna, attempts to decode the transmitted information. As such, the performance of the pinching-antenna system is evaluated in terms of average secrecy capacity, strictly positive secrecy capacity, and secrecy outage probability. To this end, accurate mathematical expressions for the aforementioned performance metrics are provided. To validate the analysis, the analytical results are numerically evaluated and further validated through MonteCarlo simulations. The results demonstrate that secrecy capacity between the base station and the legitimate destination improves when the height of the pinching-antenna placed closer to the destination. Additionally, the performance can be improved when the eavesdropper's location over a rectangular area increases.

Problem

• Evaluates physical-layer security of pinching-antenna systems
• Analyzes secrecy capacity against eavesdropper interception
• Optimizes antenna height for improved secure communication

Innovation

• Single pinching-antenna for secure communication
• Mathematical models for secrecy performance metrics
• Height and location optimization for improved security