Physical-Layer Security of Pinching-Antenna Systems

TL;DR

This work addresses physical-layer security for pinching-antenna systems on a lossless dielectric waveguide. It derives closed-form integral expressions for the average secrecy capacity $\mathcal{C}_s^{ASC}$, strictly positive secrecy capacity $\mathcal{P}^{SPSC}$, and secrecy outage probability $\mathcal{P}^{SOP}$ based on the PDFs/CDFs of the legitimate and eavesdropper SNRs, and validates them with Monte Carlo simulations. The key findings show that lowering the pinching-antenna height $h$ (closer proximity to the destination) enhances secrecy, while eavesdropper-related parameters such as $\overline{\gamma}_E$ and the eavesdropper’s location area influence $\mathcal{P}^{SPSC}$ and $\mathcal{P}^{SOP}$ in predictable ways. The results provide analytical tools for designing pinching-antenna deployments to improve physical-layer security in future wireless 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.

Figures (5)

• Figure 1: A pinching-antenna system with a legitimate destination and an eavesdropper.
• Figure 2: Performance of average SC for the pinching-antenna system. $\overline{\gamma}_{E}=50$ dB.
• Figure 3: Performance of SPSC for PA system. $h=2$ m, $D_{x_{M}} = D_{x_{E}}=10$ m, and $D_{y_{M}} = D_{y_{E}}=30$ m.
• Figure 4: Performance of SPSC for the pinching-antenna system. $\overline{\gamma}_{E}=60$ dB, $h=2$ m, $D_{x_{M}} =D_{x_{E}}=D_{y_{M}}=10$ m.
• Figure 5: Performance of SOP for the pinching-antenna system. $R_{s} = 0.25$ bps/Hz and $h=2$ m.