{
  "abstract": "Wi-Fi sensing applications require unambiguous angle-of-arrival (AoA) estimation over the full azimuth plane. Uniform circular arrays (UCAs) are shown to remove this ambiguity, but deploying the four RF chains typically available on commercial Wi-Fi chipsets into a sparse layout suffers from spatial undersampling. Such undersampling produces strong grating lobes. To overcome this hardware bottleneck, we first establish a generalized array manifold incorporating element radiation patterns, revealing the suitability and degradation mechanisms of directional UCAs. Then we propose an angularly staggered beam-switched UCA architecture that leverages the spatial complementarity. Numerical evaluations demonstrate that the proposed scheme effectively mitigates grating-lobe ambiguities without increasing the number of RF chains, significantly reducing AoA estimation outliers and improving omnidirectional tracking performance.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2611.02378",
  "author_total": 5,
  "authors": [
    {
      "name": "Yang Chen"
    },
    {
      "name": "Riccardo Bersan"
    },
    {
      "name": "Daniele Piazza"
    },
    {
      "name": "Stefano Savazzi"
    },
    {
      "name": "Michele D'Amico"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/3c2tx57rqf435.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2611.02378",
  "fulltext_url": null,
  "id": "3c2tx57rqf435",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2611.02378",
  "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.IT"
    ],
    [
      "arxiv",
      "eess.SP"
    ],
    [
      "arxiv",
      "math.IT"
    ]
  ],
  "openalex": null,
  "pdf_url": "https://arxiv.org/pdf/2611.02378",
  "pmcid": null,
  "pmid": null,
  "published": "2026-11-02",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/3c2tx57rqf435.ris",
  "sources": [
    {
      "first_seen": "2026-11-03T12:21:10Z",
      "native_id": "2611.02378",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2611.02378"
    }
  ],
  "subjects": [
    {
      "field": "mathematics",
      "origin": "arxiv:math.IT",
      "subfield": "general"
    }
  ],
  "title": "A Beam-Switched Sparse Circular Array for Passive Wi-Fi Sensing",
  "title_text": "A Beam-Switched Sparse Circular Array for Passive Wi-Fi Sensing",
  "type": "preprint",
  "updated_at": "2026-11-05T15:20:22Z",
  "url": "https://research.draconitic.com/paper/3c2tx57rqf435",
  "venue": "arXiv",
  "versions": []
}