{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2026:3OI5BU5WO7OKCSU2W4FUGJQHSD","short_pith_number":"pith:3OI5BU5W","schema_version":"1.0","canonical_sha256":"db91d0d3b677dca14a9ab70b43260790e161245af0a9d87a9b3f5233daa2e802","source":{"kind":"arxiv","id":"2601.22526","version":2},"attestation_state":"computed","paper":{"title":"Flexible FTN-Aided OTFS Modulation for High-Mobility LEO Satellite-to-Ground Communications","license":"http://creativecommons.org/licenses/by-nc-nd/4.0/","headline":"","cross_cats":["math.IT"],"primary_cat":"cs.IT","authors_text":"Benjamin K. Ng, Chan-Tong Lam, Chaorong Zhang, Halim Yanikomeroglu, Hui Xu, Yue Liu","submitted_at":"2026-01-30T04:00:01Z","abstract_excerpt":"In low Earth orbit (LEO) satellite communications, the link quality fluctuates drastically during a satellite pass, exhibiting a wide dynamic range from the horizon to the zenith. Moreover, the high relative velocity induces severe Doppler shifts. While orthogonal time frequency space (OTFS) modulation effectively resolves the doubly-selective fading, its spectral efficiency is fundamentally bounded by the Nyquist limit. To break this bottleneck while adapting to dynamic channel variations, this paper proposes a LEO satellite-assisted flexible faster-than-Nyquist (FFTN)-OTFS (LEO-FFTN-OTFS) sc"},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"2601.22526","kind":"arxiv","version":2},"metadata":{"license":"http://creativecommons.org/licenses/by-nc-nd/4.0/","primary_cat":"cs.IT","submitted_at":"2026-01-30T04:00:01Z","cross_cats_sorted":["math.IT"],"title_canon_sha256":"bfd784ad2fabe3e30fa745247169a018fa2e4ca2cdde9c3389c1a4524db203a5","abstract_canon_sha256":"b635debe3aada4f62d20ed69d4c3231e6ba095fcd38b3022ec26b75c1a3df07f"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-06-09T02:07:18.478391Z","signature_b64":"W9CgzF50Hz0Zy7RhgLNdaCY93U0OeDwG9R42tF6Pcg55XYkAPV+ysN9A0Le+JVgB3SVNEWAKTtUfKV63+zgWCw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"db91d0d3b677dca14a9ab70b43260790e161245af0a9d87a9b3f5233daa2e802","last_reissued_at":"2026-06-09T02:07:18.476889Z","signature_status":"signed_v1","first_computed_at":"2026-06-09T02:07:18.476889Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Flexible FTN-Aided OTFS Modulation for High-Mobility LEO Satellite-to-Ground Communications","license":"http://creativecommons.org/licenses/by-nc-nd/4.0/","headline":"","cross_cats":["math.IT"],"primary_cat":"cs.IT","authors_text":"Benjamin K. Ng, Chan-Tong Lam, Chaorong Zhang, Halim Yanikomeroglu, Hui Xu, Yue Liu","submitted_at":"2026-01-30T04:00:01Z","abstract_excerpt":"In low Earth orbit (LEO) satellite communications, the link quality fluctuates drastically during a satellite pass, exhibiting a wide dynamic range from the horizon to the zenith. Moreover, the high relative velocity induces severe Doppler shifts. While orthogonal time frequency space (OTFS) modulation effectively resolves the doubly-selective fading, its spectral efficiency is fundamentally bounded by the Nyquist limit. To break this bottleneck while adapting to dynamic channel variations, this paper proposes a LEO satellite-assisted flexible faster-than-Nyquist (FFTN)-OTFS (LEO-FFTN-OTFS) sc"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2601.22526","kind":"arxiv","version":2},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2601.22526/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"},"aliases":[{"alias_kind":"arxiv","alias_value":"2601.22526","created_at":"2026-06-09T02:07:18.477049+00:00"},{"alias_kind":"arxiv_version","alias_value":"2601.22526v2","created_at":"2026-06-09T02:07:18.477049+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2601.22526","created_at":"2026-06-09T02:07:18.477049+00:00"},{"alias_kind":"pith_short_12","alias_value":"3OI5BU5WO7OK","created_at":"2026-06-09T02:07:18.477049+00:00"},{"alias_kind":"pith_short_16","alias_value":"3OI5BU5WO7OKCSU2","created_at":"2026-06-09T02:07:18.477049+00:00"},{"alias_kind":"pith_short_8","alias_value":"3OI5BU5W","created_at":"2026-06-09T02:07:18.477049+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":0,"internal_anchor_count":0,"sample":[]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/3OI5BU5WO7OKCSU2W4FUGJQHSD","json":"https://pith.science/pith/3OI5BU5WO7OKCSU2W4FUGJQHSD.json","graph_json":"https://pith.science/api/pith-number/3OI5BU5WO7OKCSU2W4FUGJQHSD/graph.json","events_json":"https://pith.science/api/pith-number/3OI5BU5WO7OKCSU2W4FUGJQHSD/events.json","paper":"https://pith.science/paper/3OI5BU5W"},"agent_actions":{"view_html":"https://pith.science/pith/3OI5BU5WO7OKCSU2W4FUGJQHSD","download_json":"https://pith.science/pith/3OI5BU5WO7OKCSU2W4FUGJQHSD.json","view_paper":"https://pith.science/paper/3OI5BU5W","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=2601.22526&json=true","fetch_graph":"https://pith.science/api/pith-number/3OI5BU5WO7OKCSU2W4FUGJQHSD/graph.json","fetch_events":"https://pith.science/api/pith-number/3OI5BU5WO7OKCSU2W4FUGJQHSD/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/3OI5BU5WO7OKCSU2W4FUGJQHSD/action/timestamp_anchor","attest_storage":"https://pith.science/pith/3OI5BU5WO7OKCSU2W4FUGJQHSD/action/storage_attestation","attest_author":"https://pith.science/pith/3OI5BU5WO7OKCSU2W4FUGJQHSD/action/author_attestation","sign_citation":"https://pith.science/pith/3OI5BU5WO7OKCSU2W4FUGJQHSD/action/citation_signature","submit_replication":"https://pith.science/pith/3OI5BU5WO7OKCSU2W4FUGJQHSD/action/replication_record"}},"created_at":"2026-06-09T02:07:18.477049+00:00","updated_at":"2026-06-09T02:07:18.477049+00:00"}