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Fluid Antenna Secure Channel-driven Constellation (FASCC): a Physical Layer Security approach

  • Daniel Dinis
  • Risto Wichman
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Abstract

Fluid antenna systems (FAS) have recently emerged as a promising technology for future wireless networks due to their ability to access a large number of channel realizations using a single radio-frequency chain. This capability creates new opportunities for physical-layer security beyond conventional beamforming and artificial-noise approaches. In this paper, we propose a novel Fluid Antenna Secure Channel-driven Constellation (FASCC) framework for downlink communications, in which information is conveyed through channel-domain constellation points generated by FAS port selection and phase adaptation. Two complementary FASCC schemes are developed, depending on the availability of eavesdropper's channel state information. Numerical results demonstrate that the proposed FASCC framework achieves significant secrecy gains in terms of bit error rate and mutual-information secrecy performance, even when Eve is significantly closer to the base station than Bob.

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Cite

BibTeXRIS
BibTeX
@misc{dinis2026fluid,
  title = {{Fluid Antenna Secure Channel-driven Constellation (FASCC): a Physical Layer Security approach}},
  author = {Daniel Dinis and Risto Wichman},
  howpublished = {arXiv},
  year = {2026},
  month = oct,
  doi = {10.48550/arxiv.2610.04625},
  eprint = {2610.04625},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2610.04625},
}
RIS
TY  - UNPB
TI  - Fluid Antenna Secure Channel-driven Constellation (FASCC): a Physical Layer Security approach
AU  - Daniel Dinis
AU  - Risto Wichman
PY  - 2026
DA  - 2026/10/03
PB  - arXiv
DO  - 10.48550/arxiv.2610.04625
UR  - https://arxiv.org/abs/2610.04625
AB  - Fluid antenna systems (FAS) have recently emerged as a promising technology for future wireless networks due to their ability to access a large number of channel realizations using a single radio-frequency chain. This capability creates new opportunities for physical-layer security beyond conventional beamforming and artificial-noise approaches. In this paper, we propose a novel Fluid Antenna Secure Channel-driven Constellation (FASCC) framework for downlink communications, in which information is conveyed through channel-domain constellation points generated by FAS port selection and phase adaptation. Two complementary FASCC schemes are developed, depending on the availability of eavesdropper's channel state information. Numerical results demonstrate that the proposed FASCC framework achieves significant secrecy gains in terms of bit error rate and mutual-information secrecy performance, even when Eve is significantly closer to the base station than Bob.
ER  -