{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2012:VJKBZVG7JHWY6WQXMJ4ZM5PDEQ","short_pith_number":"pith:VJKBZVG7","schema_version":"1.0","canonical_sha256":"aa541cd4df49ed8f5a1762799675e3240e858edb47a0af544f1ba52b7699a3ba","source":{"kind":"arxiv","id":"1208.3254","version":1},"attestation_state":"computed","paper":{"title":"Carrier Frequency Offset Estimation for Two-Way Relaying: Optimal Preamble and Estimator Design","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["math.IT"],"primary_cat":"cs.IT","authors_text":"Chin Keong Ho, Patrick Ho Wang Fung, Sumei Sun","submitted_at":"2012-08-16T00:25:50Z","abstract_excerpt":"We consider the problem of carrier frequency offset (CFO) estimation for a two-way relaying system based on the amplify-and-forward (AF) protocol. Our contributions are in designing an optimal preamble, and the corresponding estimator, to closely achieve the minimum Cramer-Rao bound (CRB) for the CFO. This optimality is asserted with respect to the novel class of preambles, referred to as the block-rotated preambles (BRPs). This class includes the periodic preamble that is used widely in practice, yet it provides an additional degree of design freedom via a block rotation angle. We first ident"},"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":"1208.3254","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2012-08-16T00:25:50Z","cross_cats_sorted":["math.IT"],"title_canon_sha256":"50c9c4f4778314ff1204e482e637f2c6e6d735f473e0893caec6b78c685fdc64","abstract_canon_sha256":"74dfe5591f569b5cf9483509c6e30e4aa084e80733a1ca5f7bdfebf967604a75"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T03:48:36.407399Z","signature_b64":"VReeFqS76e3dNLM/MzWD7PdkuTsmqO2hVls1zV9NNA7WFwjK1CE0MJKVTbQxPfnfifICeLSsVfM0z66mfDYMAA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"aa541cd4df49ed8f5a1762799675e3240e858edb47a0af544f1ba52b7699a3ba","last_reissued_at":"2026-05-18T03:48:36.406761Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T03:48:36.406761Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Carrier Frequency Offset Estimation for Two-Way Relaying: Optimal Preamble and Estimator Design","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["math.IT"],"primary_cat":"cs.IT","authors_text":"Chin Keong Ho, Patrick Ho Wang Fung, Sumei Sun","submitted_at":"2012-08-16T00:25:50Z","abstract_excerpt":"We consider the problem of carrier frequency offset (CFO) estimation for a two-way relaying system based on the amplify-and-forward (AF) protocol. Our contributions are in designing an optimal preamble, and the corresponding estimator, to closely achieve the minimum Cramer-Rao bound (CRB) for the CFO. This optimality is asserted with respect to the novel class of preambles, referred to as the block-rotated preambles (BRPs). This class includes the periodic preamble that is used widely in practice, yet it provides an additional degree of design freedom via a block rotation angle. We first ident"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1208.3254","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":""},"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":"1208.3254","created_at":"2026-05-18T03:48:36.406861+00:00"},{"alias_kind":"arxiv_version","alias_value":"1208.3254v1","created_at":"2026-05-18T03:48:36.406861+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1208.3254","created_at":"2026-05-18T03:48:36.406861+00:00"},{"alias_kind":"pith_short_12","alias_value":"VJKBZVG7JHWY","created_at":"2026-05-18T12:27:25.539911+00:00"},{"alias_kind":"pith_short_16","alias_value":"VJKBZVG7JHWY6WQX","created_at":"2026-05-18T12:27:25.539911+00:00"},{"alias_kind":"pith_short_8","alias_value":"VJKBZVG7","created_at":"2026-05-18T12:27:25.539911+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/VJKBZVG7JHWY6WQXMJ4ZM5PDEQ","json":"https://pith.science/pith/VJKBZVG7JHWY6WQXMJ4ZM5PDEQ.json","graph_json":"https://pith.science/api/pith-number/VJKBZVG7JHWY6WQXMJ4ZM5PDEQ/graph.json","events_json":"https://pith.science/api/pith-number/VJKBZVG7JHWY6WQXMJ4ZM5PDEQ/events.json","paper":"https://pith.science/paper/VJKBZVG7"},"agent_actions":{"view_html":"https://pith.science/pith/VJKBZVG7JHWY6WQXMJ4ZM5PDEQ","download_json":"https://pith.science/pith/VJKBZVG7JHWY6WQXMJ4ZM5PDEQ.json","view_paper":"https://pith.science/paper/VJKBZVG7","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=1208.3254&json=true","fetch_graph":"https://pith.science/api/pith-number/VJKBZVG7JHWY6WQXMJ4ZM5PDEQ/graph.json","fetch_events":"https://pith.science/api/pith-number/VJKBZVG7JHWY6WQXMJ4ZM5PDEQ/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/VJKBZVG7JHWY6WQXMJ4ZM5PDEQ/action/timestamp_anchor","attest_storage":"https://pith.science/pith/VJKBZVG7JHWY6WQXMJ4ZM5PDEQ/action/storage_attestation","attest_author":"https://pith.science/pith/VJKBZVG7JHWY6WQXMJ4ZM5PDEQ/action/author_attestation","sign_citation":"https://pith.science/pith/VJKBZVG7JHWY6WQXMJ4ZM5PDEQ/action/citation_signature","submit_replication":"https://pith.science/pith/VJKBZVG7JHWY6WQXMJ4ZM5PDEQ/action/replication_record"}},"created_at":"2026-05-18T03:48:36.406861+00:00","updated_at":"2026-05-18T03:48:36.406861+00:00"}