Pinching-Antenna System (PASS) Enhanced Covert Communications

Hao Jiang; Zhaolin Wang; Yuanwei Liu

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arXiv · 2504.10442

Pinching-Antenna System (PASS) Enhanced Covert Communications

Hao Jiang·Zhaolin Wang·Yuanwei Liu

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Abstract

A Pinching-Antenna SyStem (PASS)-assisted convert communication framework is proposed. PASS utilizes dielectric waveguides with freely positioned pinching antennas (PAs) to establish strong line-of-sight links. Capitalizing on this high reconfigurable flexibility of antennas, the potential of PASS for covert communications is investigated. 1)~For the single-waveguide single-PA (SWSP) scenario, a closed-form optimal PA position that maximizes the covert rate is first derived. Subsequently, a one-dimensional power search is employed to enable low-complexity optimization for covert communications. With antenna mobility on a scale of meters, PASS can deal with the challenging situation of the eavesdropper enjoying better channel conditions than the legal user. 2)~For the multi-waveguide multi-PA (MWMP) scenario, the positions of multiple PAs are optimized to enable effective pinching beamforming, thereby enhancing the covert rate. To address the resultant multimodal joint transmit and pinching beamforming problem, a twin particle swarm optimization (TwinPSO) approach is proposed. Numerical results demonstrate that: i)~the proposed approaches can effectively resolve the optimization problems; ii)~PASS achieves a higher covert rate than conventional fixed-position antenna architectures; and iii)~with enhanced flexibility, the MWMP setup outperforms the SWSP counterpart.

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BibTeX RIS

Hao Jiang, Zhaolin Wang, Yuanwei Liu. 2025-04-14. Pinching-Antenna System (PASS) Enhanced Covert Communications. https://arxiv.org/abs/2504.10442

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