{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2013:54BQ7BL6VMKXMEAINLKKWKGWPY","short_pith_number":"pith:54BQ7BL6","canonical_record":{"source":{"id":"1302.1842","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2013-02-07T19:55:06Z","cross_cats_sorted":["math.IT"],"title_canon_sha256":"00fdb3e51e9fe761e406c1804c4624e3f1370c3424ffafc69b6ae1156e71aa73","abstract_canon_sha256":"6a9b271532b418e6b2d68e4d0fec5e172c9f1ec1ef6f8fceff9cdd94fc7d79b0"},"schema_version":"1.0"},"canonical_sha256":"ef030f857eab157610086ad4ab28d67e3975d874c55f98b810486e4d864ff5b9","source":{"kind":"arxiv","id":"1302.1842","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1302.1842","created_at":"2026-05-18T03:31:32Z"},{"alias_kind":"arxiv_version","alias_value":"1302.1842v1","created_at":"2026-05-18T03:31:32Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1302.1842","created_at":"2026-05-18T03:31:32Z"},{"alias_kind":"pith_short_12","alias_value":"54BQ7BL6VMKX","created_at":"2026-05-18T12:27:34Z"},{"alias_kind":"pith_short_16","alias_value":"54BQ7BL6VMKXMEAI","created_at":"2026-05-18T12:27:34Z"},{"alias_kind":"pith_short_8","alias_value":"54BQ7BL6","created_at":"2026-05-18T12:27:34Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2013:54BQ7BL6VMKXMEAINLKKWKGWPY","target":"record","payload":{"canonical_record":{"source":{"id":"1302.1842","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2013-02-07T19:55:06Z","cross_cats_sorted":["math.IT"],"title_canon_sha256":"00fdb3e51e9fe761e406c1804c4624e3f1370c3424ffafc69b6ae1156e71aa73","abstract_canon_sha256":"6a9b271532b418e6b2d68e4d0fec5e172c9f1ec1ef6f8fceff9cdd94fc7d79b0"},"schema_version":"1.0"},"canonical_sha256":"ef030f857eab157610086ad4ab28d67e3975d874c55f98b810486e4d864ff5b9","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T03:31:32.453981Z","signature_b64":"hTec0XkjRg4EXdyGnPKvoQ41P8lPHNdm3kte0D78/y0aVb9QOOm6ZjNL9Umr7FD1Q5+iatmxkm+8UVwacoj2Bg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"ef030f857eab157610086ad4ab28d67e3975d874c55f98b810486e4d864ff5b9","last_reissued_at":"2026-05-18T03:31:32.453433Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T03:31:32.453433Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1302.1842","source_version":1,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T03:31:32Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"38MLwEsI95xX/+ObTDdXQ2KdCr/uCjfQAkNCx5pifKb1068KeNQInFr5eFgfAVMuKkn/rzrI503v717Vtm03CQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-08T11:58:53.284748Z"},"content_sha256":"4a6ef491a5526b6efaffd4c15e0b6b7b2412c47eec98b62a819ce4f2b1a06137","schema_version":"1.0","event_id":"sha256:4a6ef491a5526b6efaffd4c15e0b6b7b2412c47eec98b62a819ce4f2b1a06137"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2013:54BQ7BL6VMKXMEAINLKKWKGWPY","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Adaptive Compressive Spectrum Sensing for Wideband Cognitive Radios","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["math.IT"],"primary_cat":"cs.IT","authors_text":"A. Nallanathan, Hongjian Sun, Wei-Yu Chiu","submitted_at":"2013-02-07T19:55:06Z","abstract_excerpt":"This letter presents an adaptive spectrum sensing algorithm that detects wideband spectrum using sub-Nyquist sampling rates. By taking advantage of compressed sensing (CS), the proposed algorithm reconstructs the wideband spectrum from compressed samples. Furthermore, an l2 norm validation approach is proposed that enables cognitive radios (CRs) to automatically terminate the signal acquisition once the current spectral recovery is satisfactory, leading to enhanced CR throughput. Numerical results show that the proposed algorithm can not only shorten the spectrum sensing interval, but also imp"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1302.1842","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"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T03:31:32Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"qkZs7PsWN9rpvMgXLWqxJ442tQjC/2IpawRgcmnOgT1HGXWVFjXTk4kR3tfVOGTYubUVCajRWXLNJ1faBTRtBA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-08T11:58:53.285306Z"},"content_sha256":"175929a99da4b960a3fbcb8f598406671365b93f03333d75f8b763902e70c784","schema_version":"1.0","event_id":"sha256:175929a99da4b960a3fbcb8f598406671365b93f03333d75f8b763902e70c784"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/54BQ7BL6VMKXMEAINLKKWKGWPY/bundle.json","state_url":"https://pith.science/pith/54BQ7BL6VMKXMEAINLKKWKGWPY/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/54BQ7BL6VMKXMEAINLKKWKGWPY/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":"2026-06-08T11:58:53Z","links":{"resolver":"https://pith.science/pith/54BQ7BL6VMKXMEAINLKKWKGWPY","bundle":"https://pith.science/pith/54BQ7BL6VMKXMEAINLKKWKGWPY/bundle.json","state":"https://pith.science/pith/54BQ7BL6VMKXMEAINLKKWKGWPY/state.json","well_known_bundle":"https://pith.science/.well-known/pith/54BQ7BL6VMKXMEAINLKKWKGWPY/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2013:54BQ7BL6VMKXMEAINLKKWKGWPY","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":"6a9b271532b418e6b2d68e4d0fec5e172c9f1ec1ef6f8fceff9cdd94fc7d79b0","cross_cats_sorted":["math.IT"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2013-02-07T19:55:06Z","title_canon_sha256":"00fdb3e51e9fe761e406c1804c4624e3f1370c3424ffafc69b6ae1156e71aa73"},"schema_version":"1.0","source":{"id":"1302.1842","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1302.1842","created_at":"2026-05-18T03:31:32Z"},{"alias_kind":"arxiv_version","alias_value":"1302.1842v1","created_at":"2026-05-18T03:31:32Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1302.1842","created_at":"2026-05-18T03:31:32Z"},{"alias_kind":"pith_short_12","alias_value":"54BQ7BL6VMKX","created_at":"2026-05-18T12:27:34Z"},{"alias_kind":"pith_short_16","alias_value":"54BQ7BL6VMKXMEAI","created_at":"2026-05-18T12:27:34Z"},{"alias_kind":"pith_short_8","alias_value":"54BQ7BL6","created_at":"2026-05-18T12:27:34Z"}],"graph_snapshots":[{"event_id":"sha256:175929a99da4b960a3fbcb8f598406671365b93f03333d75f8b763902e70c784","target":"graph","created_at":"2026-05-18T03:31:32Z","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"},"paper":{"abstract_excerpt":"This letter presents an adaptive spectrum sensing algorithm that detects wideband spectrum using sub-Nyquist sampling rates. By taking advantage of compressed sensing (CS), the proposed algorithm reconstructs the wideband spectrum from compressed samples. Furthermore, an l2 norm validation approach is proposed that enables cognitive radios (CRs) to automatically terminate the signal acquisition once the current spectral recovery is satisfactory, leading to enhanced CR throughput. Numerical results show that the proposed algorithm can not only shorten the spectrum sensing interval, but also imp","authors_text":"A. Nallanathan, Hongjian Sun, Wei-Yu Chiu","cross_cats":["math.IT"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2013-02-07T19:55:06Z","title":"Adaptive Compressive Spectrum Sensing for Wideband Cognitive Radios"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1302.1842","kind":"arxiv","version":1},"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":"sha256:4a6ef491a5526b6efaffd4c15e0b6b7b2412c47eec98b62a819ce4f2b1a06137","target":"record","created_at":"2026-05-18T03:31:32Z","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":"6a9b271532b418e6b2d68e4d0fec5e172c9f1ec1ef6f8fceff9cdd94fc7d79b0","cross_cats_sorted":["math.IT"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2013-02-07T19:55:06Z","title_canon_sha256":"00fdb3e51e9fe761e406c1804c4624e3f1370c3424ffafc69b6ae1156e71aa73"},"schema_version":"1.0","source":{"id":"1302.1842","kind":"arxiv","version":1}},"canonical_sha256":"ef030f857eab157610086ad4ab28d67e3975d874c55f98b810486e4d864ff5b9","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"ef030f857eab157610086ad4ab28d67e3975d874c55f98b810486e4d864ff5b9","first_computed_at":"2026-05-18T03:31:32.453433Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T03:31:32.453433Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"hTec0XkjRg4EXdyGnPKvoQ41P8lPHNdm3kte0D78/y0aVb9QOOm6ZjNL9Umr7FD1Q5+iatmxkm+8UVwacoj2Bg==","signature_status":"signed_v1","signed_at":"2026-05-18T03:31:32.453981Z","signed_message":"canonical_sha256_bytes"},"source_id":"1302.1842","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:4a6ef491a5526b6efaffd4c15e0b6b7b2412c47eec98b62a819ce4f2b1a06137","sha256:175929a99da4b960a3fbcb8f598406671365b93f03333d75f8b763902e70c784"],"state_sha256":"383b74e99beb3bf53c511294c3f72a36eb809c6db30a48b4068b8232c7492fe9"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"jQDX6xm4B/svDkVAvovtrUdt17YDrmfDNPl6OemFVntThhAD716UM9Z5OAAbqPjpTAIgfvW0lMhPbZt5CdR+Bw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-08T11:58:53.288774Z","bundle_sha256":"664637fa7f6aa090dd83ec6ab0176d2173cbfdcb1690be2e8a71bfcacb568422"}}