{
  "abstract": "Conventional channel estimation for multiple-input multiple-output orthogonal frequency-division multiplexing (MIMO-OFDM) relies on the pilot interpolation without explicitly identifying the sparse delay-angle (DA) components. To exploit DA sparsity while maintaining backward compatibility with existing MIMO-OFDM systems, we propose a cross-domain channel estimation scheme for multiuser MIMO-OFDM (MU-MIMO-OFDM) systems. The scheme exploits the circular convolution structure in the DA domain to identify candidate DA pairs by correlating delay-domain observations with DA pilot responses. These pairs and the known pilots then define a time-frequency (TF) dictionary for refining the DA coefficients from TF observations through least-squares or sparsity-regularized fitting. The refined coefficients and candidate pairs reconstruct the aggregate channel across antennas and subcarriers aligning with the geometric channel model. Numerical results show approximately 10 dB and 7 dB lower normalized mean-square error than the conventional OFDM estimation schemes for integer and fractional delay and angle indices, respectively.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2611.10052",
  "author_total": 5,
  "authors": [
    {
      "name": "Mingcheng Nie"
    },
    {
      "name": "Shuangyang Li"
    },
    {
      "name": "Ruoxi Chong"
    },
    {
      "name": "Giuseppe Caire"
    },
    {
      "name": "Yonghui Li"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/57gr8d7dek91q.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2611.10052",
  "fulltext_url": null,
  "id": "57gr8d7dek91q",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2611.10052",
  "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",
      "math.IT"
    ]
  ],
  "openalex": null,
  "pdf_url": "https://arxiv.org/pdf/2611.10052",
  "pmcid": null,
  "pmid": null,
  "published": "2026-11-05",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/57gr8d7dek91q.ris",
  "sources": [
    {
      "first_seen": "2026-11-10T06:21:33Z",
      "native_id": "2611.10052",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2611.10052"
    }
  ],
  "subjects": [
    {
      "field": "mathematics",
      "origin": "arxiv:math.IT",
      "subfield": "general"
    }
  ],
  "title": "Cross-Domain Channel Estimation for MU-MIMO-OFDM",
  "title_text": "Cross-Domain Channel Estimation for MU-MIMO-OFDM",
  "type": "preprint",
  "updated_at": "2026-11-10T06:21:33Z",
  "url": "https://research.draconitic.com/paper/57gr8d7dek91q",
  "venue": "arXiv",
  "versions": []
}