{
  "abstract": "Physical-layer key generation (PLKG) exploits reciprocal channel dynamics to generate symmetric keys, addressing the key distribution problem in wireless communications. However, strong temporal correlation in slow-fading environments limits fresh randomness and results in low key generation rates. Movable antennas (MAs) introduce spatial degrees of freedom through antenna repositioning, providing a new approach to addressing the limitation. This paper investigates MA-assisted PLKG over temporally correlated channels. A first-order Gauss-Markov process is utilized to characterize the temporal correlation of multipath gains. We characterize the full-sequence mutual information (MI) over temporally correlated channels. For fixed antenna positions and beamforming, we establish a finite-horizon approximation error bound that vanishes as both effective signal-to-noise ratios (SNRs) increase. We derive a closed-form expression for the one-step conditional MI and adopt it as a tractable key-information metric. A nonconvex problem is formulated to jointly optimize antenna positions and per-slot beamforming under transmit-power and minimum-spacing constraints. We develop an alternating optimization algorithm, combining an exact principal-eigenvector beamforming solution with feasible SCA-based projected gradient position updates. Simulation results demonstrate that the MA-assisted scheme outperforms the fixed-position antenna baseline. At a high temporal correlation coefficient, position optimization achieves approximately $51\\%$ higher rates than fixed antennas. Joint position and beamforming optimization provides a further $106\\%$ gain over position optimization alone, demonstrating more pronounced gains under strong temporal correlation.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2611.02761",
  "author_total": 5,
  "authors": [
    {
      "name": "Zhiyu Huang"
    },
    {
      "name": "Chen Sun"
    },
    {
      "name": "Guyue Li"
    },
    {
      "name": "Guanghui Wen"
    },
    {
      "name": "Xianbin Wang"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/333dz9bbnn2yp.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2611.02761",
  "fulltext_url": null,
  "id": "333dz9bbnn2yp",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2611.02761",
  "language": null,
  "licence": "LicenseRef-arXiv-nonexclusive-1.0",
  "licence_label": "arXiv licence",
  "licence_source": "article",
  "licence_url": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "cs.CR"
    ],
    [
      "arxiv",
      "cs.IT"
    ],
    [
      "arxiv",
      "eess.SP"
    ],
    [
      "arxiv",
      "math.IT"
    ]
  ],
  "openalex": null,
  "pdf_url": "https://arxiv.org/pdf/2611.02761",
  "pmcid": null,
  "pmid": null,
  "published": "2026-11-02",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/333dz9bbnn2yp.ris",
  "sources": [
    {
      "first_seen": "2026-11-03T12:21:10Z",
      "native_id": "2611.02761",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2611.02761"
    }
  ],
  "subjects": [
    {
      "field": "mathematics",
      "origin": "arxiv:math.IT",
      "subfield": "general"
    }
  ],
  "title": "Movable Antenna-Assisted Secret Key Generation over Temporally Correlated Channels",
  "title_text": "Movable Antenna-Assisted Secret Key Generation over Temporally Correlated Channels",
  "type": "preprint",
  "updated_at": "2026-11-05T15:20:22Z",
  "url": "https://research.draconitic.com/paper/333dz9bbnn2yp",
  "venue": "arXiv",
  "versions": []
}