{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2024:RSEX7MOHTOORMTV5WWJAMCJEQL","short_pith_number":"pith:RSEX7MOH","schema_version":"1.0","canonical_sha256":"8c897fb1c79b9d164ebdb59206092482e94c7471b8a961217aa935e7764420fb","source":{"kind":"arxiv","id":"2408.09381","version":1},"attestation_state":"computed","paper":{"title":"Channel Estimation, Interpolation and Extrapolation in Doubly-dispersive Channels","license":"http://creativecommons.org/licenses/by-nc-nd/4.0/","headline":"","cross_cats":[],"primary_cat":"eess.SP","authors_text":"Cheng Li, Fan Jiang, Xiaofeng Tao, Yuhui Song, Zijun Gong","submitted_at":"2024-08-18T06:45:07Z","abstract_excerpt":"The OTFS (Orthogonal Time Frequency Space) is widely acknowledged for its ability to combat Doppler spread in time-varying channels. In this paper, another advantage of OTFS over OFDM (Orthogonal Frequency Division Multiplexing) will be demonstrated: much reduced channel training overhead. Specifically, the sparsity of the channel in delay-Doppler (D-D) domain implies strong correlation of channel gains in time-frequency (T-F) domain, which can be harnessed to reduce channel training overhead through interpolation. An immediate question is how much training overhead is needed in doubly-dispers"},"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":"2408.09381","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by-nc-nd/4.0/","primary_cat":"eess.SP","submitted_at":"2024-08-18T06:45:07Z","cross_cats_sorted":[],"title_canon_sha256":"1f20a9f4d6dae68e1287bd69de0370886e991a04038e8037896a838e07ae30ad","abstract_canon_sha256":"019b9a49155ff0f174bb071c747c3d7d9f24c54a7ae9c790325e542a09943ff2"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T08:56:31.710156Z","signature_b64":"ImV/K5nujPcUZSKv5EgSUZM0k6Z94uxasT2lStAuPAR2uo8WJ5KVYYrjwoO4wbMeZc92btP8/l2bDzocWQ3lBg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"8c897fb1c79b9d164ebdb59206092482e94c7471b8a961217aa935e7764420fb","last_reissued_at":"2026-07-05T08:56:31.709775Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T08:56:31.709775Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Channel Estimation, Interpolation and Extrapolation in Doubly-dispersive Channels","license":"http://creativecommons.org/licenses/by-nc-nd/4.0/","headline":"","cross_cats":[],"primary_cat":"eess.SP","authors_text":"Cheng Li, Fan Jiang, Xiaofeng Tao, Yuhui Song, Zijun Gong","submitted_at":"2024-08-18T06:45:07Z","abstract_excerpt":"The OTFS (Orthogonal Time Frequency Space) is widely acknowledged for its ability to combat Doppler spread in time-varying channels. In this paper, another advantage of OTFS over OFDM (Orthogonal Frequency Division Multiplexing) will be demonstrated: much reduced channel training overhead. Specifically, the sparsity of the channel in delay-Doppler (D-D) domain implies strong correlation of channel gains in time-frequency (T-F) domain, which can be harnessed to reduce channel training overhead through interpolation. An immediate question is how much training overhead is needed in doubly-dispers"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2408.09381","kind":"arxiv","version":1},"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/2408.09381/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":"2408.09381","created_at":"2026-07-05T08:56:31.709832+00:00"},{"alias_kind":"arxiv_version","alias_value":"2408.09381v1","created_at":"2026-07-05T08:56:31.709832+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2408.09381","created_at":"2026-07-05T08:56:31.709832+00:00"},{"alias_kind":"pith_short_12","alias_value":"RSEX7MOHTOOR","created_at":"2026-07-05T08:56:31.709832+00:00"},{"alias_kind":"pith_short_16","alias_value":"RSEX7MOHTOORMTV5","created_at":"2026-07-05T08:56:31.709832+00:00"},{"alias_kind":"pith_short_8","alias_value":"RSEX7MOH","created_at":"2026-07-05T08:56:31.709832+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":1,"internal_anchor_count":0,"sample":[{"citing_arxiv_id":"2508.04253","citing_title":"Delay-Doppler Domain Signal Processing Aided OFDM (DD-a-OFDM) for 6G and Beyond","ref_index":24,"is_internal_anchor":false}]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/RSEX7MOHTOORMTV5WWJAMCJEQL","json":"https://pith.science/pith/RSEX7MOHTOORMTV5WWJAMCJEQL.json","graph_json":"https://pith.science/api/pith-number/RSEX7MOHTOORMTV5WWJAMCJEQL/graph.json","events_json":"https://pith.science/api/pith-number/RSEX7MOHTOORMTV5WWJAMCJEQL/events.json","paper":"https://pith.science/paper/RSEX7MOH"},"agent_actions":{"view_html":"https://pith.science/pith/RSEX7MOHTOORMTV5WWJAMCJEQL","download_json":"https://pith.science/pith/RSEX7MOHTOORMTV5WWJAMCJEQL.json","view_paper":"https://pith.science/paper/RSEX7MOH","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=2408.09381&json=true","fetch_graph":"https://pith.science/api/pith-number/RSEX7MOHTOORMTV5WWJAMCJEQL/graph.json","fetch_events":"https://pith.science/api/pith-number/RSEX7MOHTOORMTV5WWJAMCJEQL/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/RSEX7MOHTOORMTV5WWJAMCJEQL/action/timestamp_anchor","attest_storage":"https://pith.science/pith/RSEX7MOHTOORMTV5WWJAMCJEQL/action/storage_attestation","attest_author":"https://pith.science/pith/RSEX7MOHTOORMTV5WWJAMCJEQL/action/author_attestation","sign_citation":"https://pith.science/pith/RSEX7MOHTOORMTV5WWJAMCJEQL/action/citation_signature","submit_replication":"https://pith.science/pith/RSEX7MOHTOORMTV5WWJAMCJEQL/action/replication_record"}},"created_at":"2026-07-05T08:56:31.709832+00:00","updated_at":"2026-07-05T08:56:31.709832+00:00"}