{
  "abstract": "Faster-than-Nyquist (FTN) signaling can improve spectral efficiency by transmitting symbols closer together than the Nyquist limit, at the cost of additional inter-symbol interference (ISI). In this letter, we study the finite-alphabet symbol-wise achievable information rate (AIR) of FTN signaling for BPSK, QPSK, and 16-QAM under a transmit-power constraint and a common minimum mean square error (MMSE) channel-shortening (CS) detection framework, cross-validated for BPSK against an independent reduced-state Ungerboeck Bahl-Cocke-Jelinek-Raviv (BCJR) benchmark. Our results show a clear trend. Lower-order constellations can benefit from more aggressive time acceleration, while higher-order constellations become less tolerant of acceleration and achieve their best spectral efficiency closer to the Nyquist limit. At a reference signal-to-noise ratio (SNR) of 6 dB the optimum acceleration factor shifts from $τ^\\star\\approx0.65$ for BPSK to 0.75 for QPSK and 0.90 for 16-QAM. We further show that this trend is preserved in coded systems and remains robust to the detector memory. The impact of FTN operation on the instantaneous-to-average power ratio (IAPR) is also examined. Overall, the results highlight how constellation order should be considered when selecting the operating point for FTN signaling.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.12066",
  "author_total": 7,
  "authors": [
    {
      "name": "Emre Cerci"
    },
    {
      "name": "Adem Cicek"
    },
    {
      "name": "Melda Yuksel"
    },
    {
      "name": "Gokhan M. Guvensen"
    },
    {
      "name": "Enver Cavus"
    },
    {
      "name": "Yaser Dalveren"
    },
    {
      "name": "Halim Yanikomeroglu"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/a1bd3ryrkbse2.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.12066",
  "fulltext_url": null,
  "id": "a1bd3ryrkbse2",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.12066",
  "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",
      "2208|Advanced Wireless Communication Techniques"
    ]
  ],
  "openalex": "W7221173451",
  "pdf_url": "https://arxiv.org/pdf/2610.12066",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-08",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/a1bd3ryrkbse2.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:27:58Z",
      "native_id": "2610.12066",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.12066"
    }
  ],
  "subjects": [
    {
      "field": "mathematics",
      "origin": "arxiv:math.IT",
      "subfield": "general"
    }
  ],
  "title": "FTN Signaling: Spectral Efficiency from BPSK to 16-QAM",
  "title_text": "FTN Signaling: Spectral Efficiency from BPSK to 16-QAM",
  "type": "preprint",
  "updated_at": "2026-10-30T12:27:58Z",
  "url": "https://research.draconitic.com/paper/a1bd3ryrkbse2",
  "venue": "arXiv",
  "versions": []
}