{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2012:VGGQLAQTAAVBYYGXVVZJA4WCXQ","short_pith_number":"pith:VGGQLAQT","canonical_record":{"source":{"id":"1207.5342","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2012-07-23T10:22:56Z","cross_cats_sorted":["cs.LG","cs.NI","math.IT"],"title_canon_sha256":"3c78db782b4e381b9e1d327344c9c459134b908d7aa201d800e25546417059bc","abstract_canon_sha256":"6386606946ff316b8db1a771b3c09479dd5186cfee1909b90cc31c201a7b3b20"},"schema_version":"1.0"},"canonical_sha256":"a98d058213002a1c60d7ad729072c2bc18602775e7d458b045579121238a703d","source":{"kind":"arxiv","id":"1207.5342","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1207.5342","created_at":"2026-05-18T00:56:52Z"},{"alias_kind":"arxiv_version","alias_value":"1207.5342v1","created_at":"2026-05-18T00:56:52Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1207.5342","created_at":"2026-05-18T00:56:52Z"},{"alias_kind":"pith_short_12","alias_value":"VGGQLAQTAAVB","created_at":"2026-05-18T12:27:25Z"},{"alias_kind":"pith_short_16","alias_value":"VGGQLAQTAAVBYYGX","created_at":"2026-05-18T12:27:25Z"},{"alias_kind":"pith_short_8","alias_value":"VGGQLAQT","created_at":"2026-05-18T12:27:25Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2012:VGGQLAQTAAVBYYGXVVZJA4WCXQ","target":"record","payload":{"canonical_record":{"source":{"id":"1207.5342","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2012-07-23T10:22:56Z","cross_cats_sorted":["cs.LG","cs.NI","math.IT"],"title_canon_sha256":"3c78db782b4e381b9e1d327344c9c459134b908d7aa201d800e25546417059bc","abstract_canon_sha256":"6386606946ff316b8db1a771b3c09479dd5186cfee1909b90cc31c201a7b3b20"},"schema_version":"1.0"},"canonical_sha256":"a98d058213002a1c60d7ad729072c2bc18602775e7d458b045579121238a703d","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:56:52.588412Z","signature_b64":"hUCf9Qgpwd2OvtrbP5xDN6zl73BHKRXAChldSWvjfUFlWbJKx9LB6hj6U3RDixJqvmN9Khs2YEJw1ZAQ5XfAAw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"a98d058213002a1c60d7ad729072c2bc18602775e7d458b045579121238a703d","last_reissued_at":"2026-05-18T00:56:52.587882Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:56:52.587882Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1207.5342","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":"2026-05-18T00:56:52Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"lQ1+INESID9CZrqJfDe4qrTlaY08NP78NdyXCJXAfMJ5qzE83Fu3hdhg5rKDZGA0PdfXCnwygwT02PKoz7k2BQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-08T19:45:23.848969Z"},"content_sha256":"8768755f4984fd149bf647b957ee3bca4c7298211e45ac0f0cfd3793456b98cc","schema_version":"1.0","event_id":"sha256:8768755f4984fd149bf647b957ee3bca4c7298211e45ac0f0cfd3793456b98cc"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2012:VGGQLAQTAAVBYYGXVVZJA4WCXQ","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"A Robust Signal Classification Scheme for Cognitive Radio","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["cs.LG","cs.NI","math.IT"],"primary_cat":"cs.IT","authors_text":"Hanwen Cao, J\\\"urgen Peissig","submitted_at":"2012-07-23T10:22:56Z","abstract_excerpt":"This paper presents a robust signal classification scheme for achieving comprehensive spectrum sensing of multiple coexisting wireless systems. It is built upon a group of feature-based signal detection algorithms enhanced by the proposed dimension cancelation (DIC) method for mitigating the noise uncertainty problem. The classification scheme is implemented on our testbed consisting real-world wireless devices. The simulation and experimental performances agree with each other well and shows the effectiveness and robustness of the proposed scheme."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1207.5342","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":"2026-05-18T00:56:52Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"HCT+Z9tySm7ORp7SgDsoIv3D/eRourj9kWHCNdETasekKxaSg1QtMV48IWrEyL6LkZxONo6mOsSBkfk34/TnCg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-08T19:45:23.849701Z"},"content_sha256":"fd653b22c53d3f5bc085f19d018b29fb9dffd16c40153ccb7da6cd77c6cb65e2","schema_version":"1.0","event_id":"sha256:fd653b22c53d3f5bc085f19d018b29fb9dffd16c40153ccb7da6cd77c6cb65e2"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/VGGQLAQTAAVBYYGXVVZJA4WCXQ/bundle.json","state_url":"https://pith.science/pith/VGGQLAQTAAVBYYGXVVZJA4WCXQ/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/VGGQLAQTAAVBYYGXVVZJA4WCXQ/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":"2026-06-08T19:45:23Z","links":{"resolver":"https://pith.science/pith/VGGQLAQTAAVBYYGXVVZJA4WCXQ","bundle":"https://pith.science/pith/VGGQLAQTAAVBYYGXVVZJA4WCXQ/bundle.json","state":"https://pith.science/pith/VGGQLAQTAAVBYYGXVVZJA4WCXQ/state.json","well_known_bundle":"https://pith.science/.well-known/pith/VGGQLAQTAAVBYYGXVVZJA4WCXQ/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2012:VGGQLAQTAAVBYYGXVVZJA4WCXQ","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":"6386606946ff316b8db1a771b3c09479dd5186cfee1909b90cc31c201a7b3b20","cross_cats_sorted":["cs.LG","cs.NI","math.IT"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2012-07-23T10:22:56Z","title_canon_sha256":"3c78db782b4e381b9e1d327344c9c459134b908d7aa201d800e25546417059bc"},"schema_version":"1.0","source":{"id":"1207.5342","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1207.5342","created_at":"2026-05-18T00:56:52Z"},{"alias_kind":"arxiv_version","alias_value":"1207.5342v1","created_at":"2026-05-18T00:56:52Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1207.5342","created_at":"2026-05-18T00:56:52Z"},{"alias_kind":"pith_short_12","alias_value":"VGGQLAQTAAVB","created_at":"2026-05-18T12:27:25Z"},{"alias_kind":"pith_short_16","alias_value":"VGGQLAQTAAVBYYGX","created_at":"2026-05-18T12:27:25Z"},{"alias_kind":"pith_short_8","alias_value":"VGGQLAQT","created_at":"2026-05-18T12:27:25Z"}],"graph_snapshots":[{"event_id":"sha256:fd653b22c53d3f5bc085f19d018b29fb9dffd16c40153ccb7da6cd77c6cb65e2","target":"graph","created_at":"2026-05-18T00:56:52Z","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 paper presents a robust signal classification scheme for achieving comprehensive spectrum sensing of multiple coexisting wireless systems. It is built upon a group of feature-based signal detection algorithms enhanced by the proposed dimension cancelation (DIC) method for mitigating the noise uncertainty problem. The classification scheme is implemented on our testbed consisting real-world wireless devices. The simulation and experimental performances agree with each other well and shows the effectiveness and robustness of the proposed scheme.","authors_text":"Hanwen Cao, J\\\"urgen Peissig","cross_cats":["cs.LG","cs.NI","math.IT"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2012-07-23T10:22:56Z","title":"A Robust Signal Classification Scheme for Cognitive Radio"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1207.5342","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":"sha256:8768755f4984fd149bf647b957ee3bca4c7298211e45ac0f0cfd3793456b98cc","target":"record","created_at":"2026-05-18T00:56:52Z","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":"6386606946ff316b8db1a771b3c09479dd5186cfee1909b90cc31c201a7b3b20","cross_cats_sorted":["cs.LG","cs.NI","math.IT"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2012-07-23T10:22:56Z","title_canon_sha256":"3c78db782b4e381b9e1d327344c9c459134b908d7aa201d800e25546417059bc"},"schema_version":"1.0","source":{"id":"1207.5342","kind":"arxiv","version":1}},"canonical_sha256":"a98d058213002a1c60d7ad729072c2bc18602775e7d458b045579121238a703d","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"a98d058213002a1c60d7ad729072c2bc18602775e7d458b045579121238a703d","first_computed_at":"2026-05-18T00:56:52.587882Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:56:52.587882Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"hUCf9Qgpwd2OvtrbP5xDN6zl73BHKRXAChldSWvjfUFlWbJKx9LB6hj6U3RDixJqvmN9Khs2YEJw1ZAQ5XfAAw==","signature_status":"signed_v1","signed_at":"2026-05-18T00:56:52.588412Z","signed_message":"canonical_sha256_bytes"},"source_id":"1207.5342","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:8768755f4984fd149bf647b957ee3bca4c7298211e45ac0f0cfd3793456b98cc","sha256:fd653b22c53d3f5bc085f19d018b29fb9dffd16c40153ccb7da6cd77c6cb65e2"],"state_sha256":"7e1803003132d94ed35ccfcf3d8dfeaa2871cbb4b3c5962f8d324de417c3c02a"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"ZGpb/9ShZpoKwACMhgVefVqIRwPxFe9z3/tGx6isTq3TMTDJ/J+plB6WSQhs8+djKJgtnioaijlLG0VAf6QEAg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-08T19:45:23.853331Z","bundle_sha256":"17e1f4cb42350b77087273e457bc8db19a1297de70d29aeef6400c716e000f00"}}