{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2022:GWSK2AJ6ARB7RSIDIUHZYINC6N","short_pith_number":"pith:GWSK2AJ6","canonical_record":{"source":{"id":"2204.05086","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SP","submitted_at":"2022-04-11T13:42:19Z","cross_cats_sorted":[],"title_canon_sha256":"76b24d88c13d62292578291fd285f6f0582fff238b09d6d90791011c0c93acb4","abstract_canon_sha256":"7dba140149bce949cf3c6b6b8ae6aa787e9e4f17e52d133e6be8add5e01f44c1"},"schema_version":"1.0"},"canonical_sha256":"35a4ad013e0443f8c903450f9c21a2f343ddb62d50e103f3fe15f910e4d8459d","source":{"kind":"arxiv","id":"2204.05086","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2204.05086","created_at":"2026-07-05T07:08:03Z"},{"alias_kind":"arxiv_version","alias_value":"2204.05086v2","created_at":"2026-07-05T07:08:03Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2204.05086","created_at":"2026-07-05T07:08:03Z"},{"alias_kind":"pith_short_12","alias_value":"GWSK2AJ6ARB7","created_at":"2026-07-05T07:08:03Z"},{"alias_kind":"pith_short_16","alias_value":"GWSK2AJ6ARB7RSID","created_at":"2026-07-05T07:08:03Z"},{"alias_kind":"pith_short_8","alias_value":"GWSK2AJ6","created_at":"2026-07-05T07:08:03Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2022:GWSK2AJ6ARB7RSIDIUHZYINC6N","target":"record","payload":{"canonical_record":{"source":{"id":"2204.05086","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SP","submitted_at":"2022-04-11T13:42:19Z","cross_cats_sorted":[],"title_canon_sha256":"76b24d88c13d62292578291fd285f6f0582fff238b09d6d90791011c0c93acb4","abstract_canon_sha256":"7dba140149bce949cf3c6b6b8ae6aa787e9e4f17e52d133e6be8add5e01f44c1"},"schema_version":"1.0"},"canonical_sha256":"35a4ad013e0443f8c903450f9c21a2f343ddb62d50e103f3fe15f910e4d8459d","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T07:08:03.542482Z","signature_b64":"vZyN1hemFEgbGIHrkN4BNjg5q8qnlV8aZ8ZgOJfkjQVl/EUUUV41LEhVfDc7bZWNe7n4XMUFD4h4OUJf36cOCw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"35a4ad013e0443f8c903450f9c21a2f343ddb62d50e103f3fe15f910e4d8459d","last_reissued_at":"2026-07-05T07:08:03.542029Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T07:08:03.542029Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2204.05086","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-05T07:08:03Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"FXHqEaZ6HO7Q+wOzYEj3a8/PDZoxaT+kiknKBLpFpiPc88T2x/kHSxCd/w3p+9VMmqyg9b440q8u4I5GYKCPAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-08T03:20:41.549934Z"},"content_sha256":"28b04f8bf0ddd446995e1c11117407616b3db66531dadc040a9e4cf64754286d","schema_version":"1.0","event_id":"sha256:28b04f8bf0ddd446995e1c11117407616b3db66531dadc040a9e4cf64754286d"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2022:GWSK2AJ6ARB7RSIDIUHZYINC6N","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Blind Orthogonal Least Squares based Compressive Spectrum Sensing","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"eess.SP","authors_text":"Liyang Lu, Wenbo Xu, Yue Wang, Zhi Tian","submitted_at":"2022-04-11T13:42:19Z","abstract_excerpt":"As an enabling technique of cognitive radio (CR), compressive spectrum sensing (CSS) based on compressive sensing (CS) can detect the spectrum opportunities from wide frequency bands efficiently and accurately by using sub-Nyquist sampling rate. However, the sensing performance of most existing CSS excessively relies on the prior information such as spectrum sparsity or noise variance. Thus, a key challenge in practical CSS is how to work effectively even in the absence of such information. In this paper, we propose a blind orthogonal least squares based CSS algorithm (B-OLS-CSS), which functi"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2204.05086","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/2204.05086/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"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-05T07:08:03Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"5cayii+z0q2a7lzb4ZWTspgYiL6UO7RwHLH/vBFBh24H6lpul7ztclljIBX+DxKKcbwbYBKEarNB5mP7H62zBA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-08T03:20:41.550621Z"},"content_sha256":"bc35a8260bc84be060c67b2ef6ebda3aa9d0b78e40223e11e8856f6b511aa324","schema_version":"1.0","event_id":"sha256:bc35a8260bc84be060c67b2ef6ebda3aa9d0b78e40223e11e8856f6b511aa324"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/GWSK2AJ6ARB7RSIDIUHZYINC6N/bundle.json","state_url":"https://pith.science/pith/GWSK2AJ6ARB7RSIDIUHZYINC6N/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/GWSK2AJ6ARB7RSIDIUHZYINC6N/bundle.json","status":"primary"}],"public_keys":[{"key_id":"pith-v1-2026-05","algorithm":"ed25519","format":"raw","public_key_b64":"stVStoiQhXFxp4s2pdzPNoqVNBMojDU/fJ2db5S3CbM=","public_key_hex":"b2d552b68890857171a78b36a5dccf368a953413288c353f7c9d9d6f94b709b3","fingerprint_sha256_b32_first128bits":"RVFV5Z2OI2J3ZUO7ERDEBCYNKS","fingerprint_sha256_hex":"8d4b5ee74e4693bcd1df2446408b0d54","rotates_at":null,"url":"https://pith.science/pith-signing-key.json","notes":"Pith uses this Ed25519 key to sign canonical record SHA-256 digests. Verify with: ed25519_verify(public_key, message=canonical_sha256_bytes, signature=base64decode(signature_b64))."}],"merge_version":"pith-open-graph-merge-v1","built_at":"2026-07-08T03:20:41Z","links":{"resolver":"https://pith.science/pith/GWSK2AJ6ARB7RSIDIUHZYINC6N","bundle":"https://pith.science/pith/GWSK2AJ6ARB7RSIDIUHZYINC6N/bundle.json","state":"https://pith.science/pith/GWSK2AJ6ARB7RSIDIUHZYINC6N/state.json","well_known_bundle":"https://pith.science/.well-known/pith/GWSK2AJ6ARB7RSIDIUHZYINC6N/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2022:GWSK2AJ6ARB7RSIDIUHZYINC6N","merge_version":"pith-open-graph-merge-v1","event_count":2,"valid_event_count":2,"invalid_event_count":0,"equivocation_count":0,"current":{"canonical_record":{"metadata":{"abstract_canon_sha256":"7dba140149bce949cf3c6b6b8ae6aa787e9e4f17e52d133e6be8add5e01f44c1","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SP","submitted_at":"2022-04-11T13:42:19Z","title_canon_sha256":"76b24d88c13d62292578291fd285f6f0582fff238b09d6d90791011c0c93acb4"},"schema_version":"1.0","source":{"id":"2204.05086","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2204.05086","created_at":"2026-07-05T07:08:03Z"},{"alias_kind":"arxiv_version","alias_value":"2204.05086v2","created_at":"2026-07-05T07:08:03Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2204.05086","created_at":"2026-07-05T07:08:03Z"},{"alias_kind":"pith_short_12","alias_value":"GWSK2AJ6ARB7","created_at":"2026-07-05T07:08:03Z"},{"alias_kind":"pith_short_16","alias_value":"GWSK2AJ6ARB7RSID","created_at":"2026-07-05T07:08:03Z"},{"alias_kind":"pith_short_8","alias_value":"GWSK2AJ6","created_at":"2026-07-05T07:08:03Z"}],"graph_snapshots":[{"event_id":"sha256:bc35a8260bc84be060c67b2ef6ebda3aa9d0b78e40223e11e8856f6b511aa324","target":"graph","created_at":"2026-07-05T07:08:03Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"graph_snapshot":{"author_claims":{"count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","strong_count":0},"builder_version":"pith-number-builder-2026-05-17-v1","claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/2204.05086/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"As an enabling technique of cognitive radio (CR), compressive spectrum sensing (CSS) based on compressive sensing (CS) can detect the spectrum opportunities from wide frequency bands efficiently and accurately by using sub-Nyquist sampling rate. However, the sensing performance of most existing CSS excessively relies on the prior information such as spectrum sparsity or noise variance. Thus, a key challenge in practical CSS is how to work effectively even in the absence of such information. In this paper, we propose a blind orthogonal least squares based CSS algorithm (B-OLS-CSS), which functi","authors_text":"Liyang Lu, Wenbo Xu, Yue Wang, Zhi Tian","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SP","submitted_at":"2022-04-11T13:42:19Z","title":"Blind Orthogonal Least Squares based Compressive Spectrum Sensing"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2204.05086","kind":"arxiv","version":2},"verdict":{"created_at":null,"id":null,"model_set":{},"one_line_summary":"","pipeline_version":null,"pith_extraction_headline":"","strongest_claim":"","weakest_assumption":""}},"verdict_id":null}}],"author_attestations":[],"timestamp_anchors":[],"storage_attestations":[],"citation_signatures":[],"replication_records":[],"corrections":[],"mirror_hints":[],"record_created":{"event_id":"sha256:28b04f8bf0ddd446995e1c11117407616b3db66531dadc040a9e4cf64754286d","target":"record","created_at":"2026-07-05T07:08:03Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"attestation_state":"computed","canonical_record":{"metadata":{"abstract_canon_sha256":"7dba140149bce949cf3c6b6b8ae6aa787e9e4f17e52d133e6be8add5e01f44c1","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SP","submitted_at":"2022-04-11T13:42:19Z","title_canon_sha256":"76b24d88c13d62292578291fd285f6f0582fff238b09d6d90791011c0c93acb4"},"schema_version":"1.0","source":{"id":"2204.05086","kind":"arxiv","version":2}},"canonical_sha256":"35a4ad013e0443f8c903450f9c21a2f343ddb62d50e103f3fe15f910e4d8459d","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"35a4ad013e0443f8c903450f9c21a2f343ddb62d50e103f3fe15f910e4d8459d","first_computed_at":"2026-07-05T07:08:03.542029Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T07:08:03.542029Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"vZyN1hemFEgbGIHrkN4BNjg5q8qnlV8aZ8ZgOJfkjQVl/EUUUV41LEhVfDc7bZWNe7n4XMUFD4h4OUJf36cOCw==","signature_status":"signed_v1","signed_at":"2026-07-05T07:08:03.542482Z","signed_message":"canonical_sha256_bytes"},"source_id":"2204.05086","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:28b04f8bf0ddd446995e1c11117407616b3db66531dadc040a9e4cf64754286d","sha256:bc35a8260bc84be060c67b2ef6ebda3aa9d0b78e40223e11e8856f6b511aa324"],"state_sha256":"b6872bae9d62fc49da1f20098aa554bcd408da6b6c8ba92640e1269946e3da8b"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"+kcvItCMHhYTDr09O4r/EqbqEPQvMSJuRYZMbtYQiuT+IkknJIONPXWHybAD/PSnCc/rzDuJlqLXmDGl3ZviDg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-07-08T03:20:41.553676Z","bundle_sha256":"584ea85c6c9463f72e8e5cf5f5f2e426dcb9b291987ea91df2c042df2aed6dd9"}}