{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2009:Z5GIRAOOLWSJONCWVZ2EAWULNF","short_pith_number":"pith:Z5GIRAOO","schema_version":"1.0","canonical_sha256":"cf4c8881ce5da4973456ae74405a8b696ea9d84bd3a0d772477f074a19ea8483","source":{"kind":"arxiv","id":"0907.1992","version":2},"attestation_state":"computed","paper":{"title":"Spectrum sensing by cognitive radios at very low SNR","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["math.IT"],"primary_cat":"cs.IT","authors_text":"Ali H. Sayed, Stephen J. Shellhammer, Wenyi Zhang, Zhi Quan","submitted_at":"2009-07-11T20:38:37Z","abstract_excerpt":"Spectrum sensing is one of the enabling functionalities for cognitive radio (CR) systems to operate in the spectrum white space. To protect the primary incumbent users from interference, the CR is required to detect incumbent signals at very low signal-to-noise ratio (SNR). In this paper, we present a spectrum sensing technique based on correlating spectra for detection of television (TV) broadcasting signals. The basic strategy is to correlate the periodogram of the received signal with the a priori known spectral features of the primary signal. We show that according to the Neyman-Pearson cr"},"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":"0907.1992","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2009-07-11T20:38:37Z","cross_cats_sorted":["math.IT"],"title_canon_sha256":"91427869a1883128f38e8618cfa8da6f4e34d9b779c0d78d010bc2de3f158328","abstract_canon_sha256":"e735f649a5e23653cf5a7c705fd7a53848aa820633fd5651d259eab1b587687c"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:59:11.323931Z","signature_b64":"ZDQteMfE9BXv6eJ1OMWO2PgIKlbfwt1+8zX3vJdgfzrQXoSJsSqJU4Zqf/iCI647/OCU4rpiG28e+lqgsTtiDA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"cf4c8881ce5da4973456ae74405a8b696ea9d84bd3a0d772477f074a19ea8483","last_reissued_at":"2026-05-18T00:59:11.323293Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:59:11.323293Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Spectrum sensing by cognitive radios at very low SNR","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["math.IT"],"primary_cat":"cs.IT","authors_text":"Ali H. Sayed, Stephen J. Shellhammer, Wenyi Zhang, Zhi Quan","submitted_at":"2009-07-11T20:38:37Z","abstract_excerpt":"Spectrum sensing is one of the enabling functionalities for cognitive radio (CR) systems to operate in the spectrum white space. To protect the primary incumbent users from interference, the CR is required to detect incumbent signals at very low signal-to-noise ratio (SNR). In this paper, we present a spectrum sensing technique based on correlating spectra for detection of television (TV) broadcasting signals. The basic strategy is to correlate the periodogram of the received signal with the a priori known spectral features of the primary signal. We show that according to the Neyman-Pearson cr"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0907.1992","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":""},"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":"0907.1992","created_at":"2026-05-18T00:59:11.323428+00:00"},{"alias_kind":"arxiv_version","alias_value":"0907.1992v2","created_at":"2026-05-18T00:59:11.323428+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0907.1992","created_at":"2026-05-18T00:59:11.323428+00:00"},{"alias_kind":"pith_short_12","alias_value":"Z5GIRAOOLWSJ","created_at":"2026-05-18T12:26:02.257875+00:00"},{"alias_kind":"pith_short_16","alias_value":"Z5GIRAOOLWSJONCW","created_at":"2026-05-18T12:26:02.257875+00:00"},{"alias_kind":"pith_short_8","alias_value":"Z5GIRAOO","created_at":"2026-05-18T12:26:02.257875+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/Z5GIRAOOLWSJONCWVZ2EAWULNF","json":"https://pith.science/pith/Z5GIRAOOLWSJONCWVZ2EAWULNF.json","graph_json":"https://pith.science/api/pith-number/Z5GIRAOOLWSJONCWVZ2EAWULNF/graph.json","events_json":"https://pith.science/api/pith-number/Z5GIRAOOLWSJONCWVZ2EAWULNF/events.json","paper":"https://pith.science/paper/Z5GIRAOO"},"agent_actions":{"view_html":"https://pith.science/pith/Z5GIRAOOLWSJONCWVZ2EAWULNF","download_json":"https://pith.science/pith/Z5GIRAOOLWSJONCWVZ2EAWULNF.json","view_paper":"https://pith.science/paper/Z5GIRAOO","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=0907.1992&json=true","fetch_graph":"https://pith.science/api/pith-number/Z5GIRAOOLWSJONCWVZ2EAWULNF/graph.json","fetch_events":"https://pith.science/api/pith-number/Z5GIRAOOLWSJONCWVZ2EAWULNF/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/Z5GIRAOOLWSJONCWVZ2EAWULNF/action/timestamp_anchor","attest_storage":"https://pith.science/pith/Z5GIRAOOLWSJONCWVZ2EAWULNF/action/storage_attestation","attest_author":"https://pith.science/pith/Z5GIRAOOLWSJONCWVZ2EAWULNF/action/author_attestation","sign_citation":"https://pith.science/pith/Z5GIRAOOLWSJONCWVZ2EAWULNF/action/citation_signature","submit_replication":"https://pith.science/pith/Z5GIRAOOLWSJONCWVZ2EAWULNF/action/replication_record"}},"created_at":"2026-05-18T00:59:11.323428+00:00","updated_at":"2026-05-18T00:59:11.323428+00:00"}