{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2013:WWR7PD3Q6BUKV4ROUJMGSWHT7K","short_pith_number":"pith:WWR7PD3Q","canonical_record":{"source":{"id":"1302.1079","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2013-01-30T17:33:36Z","cross_cats_sorted":["cs.SY","math.IT"],"title_canon_sha256":"c0c9cd18b58096e8700c6a96e3813378f35b5fb56cbfd6396aad50934bc2a2fa","abstract_canon_sha256":"5a62400ebb695b96ee4df87c1dcf2a689fb2eaf1cd9158acd2898a2783003e2f"},"schema_version":"1.0"},"canonical_sha256":"b5a3f78f70f068aaf22ea2586958f3fa813e269925539dee7a8cb6991c8932da","source":{"kind":"arxiv","id":"1302.1079","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1302.1079","created_at":"2026-05-18T02:40:45Z"},{"alias_kind":"arxiv_version","alias_value":"1302.1079v1","created_at":"2026-05-18T02:40:45Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1302.1079","created_at":"2026-05-18T02:40:45Z"},{"alias_kind":"pith_short_12","alias_value":"WWR7PD3Q6BUK","created_at":"2026-05-18T12:28:06Z"},{"alias_kind":"pith_short_16","alias_value":"WWR7PD3Q6BUKV4RO","created_at":"2026-05-18T12:28:06Z"},{"alias_kind":"pith_short_8","alias_value":"WWR7PD3Q","created_at":"2026-05-18T12:28:06Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2013:WWR7PD3Q6BUKV4ROUJMGSWHT7K","target":"record","payload":{"canonical_record":{"source":{"id":"1302.1079","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2013-01-30T17:33:36Z","cross_cats_sorted":["cs.SY","math.IT"],"title_canon_sha256":"c0c9cd18b58096e8700c6a96e3813378f35b5fb56cbfd6396aad50934bc2a2fa","abstract_canon_sha256":"5a62400ebb695b96ee4df87c1dcf2a689fb2eaf1cd9158acd2898a2783003e2f"},"schema_version":"1.0"},"canonical_sha256":"b5a3f78f70f068aaf22ea2586958f3fa813e269925539dee7a8cb6991c8932da","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:40:45.840756Z","signature_b64":"/gDBfIMYb5/5zuiwphkfoIx3aita6+Mgg9ikkUR3DHLTok6ZK/c0JfhW92txmsjplPUT9H9dyzYy2cPFkKP2Bw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"b5a3f78f70f068aaf22ea2586958f3fa813e269925539dee7a8cb6991c8932da","last_reissued_at":"2026-05-18T02:40:45.840331Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:40:45.840331Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1302.1079","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":"2026-05-18T02:40:45Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"GKP1iCEj13tdEub9sNaMojWvFiL87nvvoOUcc+18AVMPEJ7Mh4KyGByBNm7O0nTPCTbpNDF8Ay5Z/D36UTNCCg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-25T17:57:48.582939Z"},"content_sha256":"c556be2db95bc5b518da5e51aff657e2aaac6ff8f7c42d938d7b8069c9f26860","schema_version":"1.0","event_id":"sha256:c556be2db95bc5b518da5e51aff657e2aaac6ff8f7c42d938d7b8069c9f26860"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2013:WWR7PD3Q6BUKV4ROUJMGSWHT7K","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Cognitive Access Policies under a Primary ARQ process via Forward-Backward Interference Cancellation","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["cs.SY","math.IT"],"primary_cat":"cs.IT","authors_text":"Marco Levorato, Michele Zorzi, Nicol\\`o Michelusi, Osvaldo Simeone, Petar Popovski","submitted_at":"2013-01-30T17:33:36Z","abstract_excerpt":"This paper introduces a novel technique for access by a cognitive Secondary User (SU) using best-effort transmission to a spectrum with an incumbent Primary User (PU), which uses Type-I Hybrid ARQ. The technique leverages the primary ARQ protocol to perform Interference Cancellation (IC) at the SU receiver (SUrx). Two IC mechanisms that work in concert are introduced: Forward IC, where SUrx, after decoding the PU message, cancels its interference in the (possible) following PU retransmissions of the same message, to improve the SU throughput; Backward IC, where SUrx performs IC on previous SU "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1302.1079","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":"2026-05-18T02:40:45Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"WskNrz4Zs9Rrh9YGHXvD6otC5z466izpjUYEICOJG0qpPXlWVESl6QBXRGwVNMUkJYfIWAwaCd9oRwEPC98YCQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-25T17:57:48.583683Z"},"content_sha256":"6e8dacfd7efa52ecee3dcc66a2417662403a19ad67049f30a7c9e1dfe6c3e6d9","schema_version":"1.0","event_id":"sha256:6e8dacfd7efa52ecee3dcc66a2417662403a19ad67049f30a7c9e1dfe6c3e6d9"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/WWR7PD3Q6BUKV4ROUJMGSWHT7K/bundle.json","state_url":"https://pith.science/pith/WWR7PD3Q6BUKV4ROUJMGSWHT7K/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/WWR7PD3Q6BUKV4ROUJMGSWHT7K/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":"2026-05-25T17:57:48Z","links":{"resolver":"https://pith.science/pith/WWR7PD3Q6BUKV4ROUJMGSWHT7K","bundle":"https://pith.science/pith/WWR7PD3Q6BUKV4ROUJMGSWHT7K/bundle.json","state":"https://pith.science/pith/WWR7PD3Q6BUKV4ROUJMGSWHT7K/state.json","well_known_bundle":"https://pith.science/.well-known/pith/WWR7PD3Q6BUKV4ROUJMGSWHT7K/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2013:WWR7PD3Q6BUKV4ROUJMGSWHT7K","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":"5a62400ebb695b96ee4df87c1dcf2a689fb2eaf1cd9158acd2898a2783003e2f","cross_cats_sorted":["cs.SY","math.IT"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2013-01-30T17:33:36Z","title_canon_sha256":"c0c9cd18b58096e8700c6a96e3813378f35b5fb56cbfd6396aad50934bc2a2fa"},"schema_version":"1.0","source":{"id":"1302.1079","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1302.1079","created_at":"2026-05-18T02:40:45Z"},{"alias_kind":"arxiv_version","alias_value":"1302.1079v1","created_at":"2026-05-18T02:40:45Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1302.1079","created_at":"2026-05-18T02:40:45Z"},{"alias_kind":"pith_short_12","alias_value":"WWR7PD3Q6BUK","created_at":"2026-05-18T12:28:06Z"},{"alias_kind":"pith_short_16","alias_value":"WWR7PD3Q6BUKV4RO","created_at":"2026-05-18T12:28:06Z"},{"alias_kind":"pith_short_8","alias_value":"WWR7PD3Q","created_at":"2026-05-18T12:28:06Z"}],"graph_snapshots":[{"event_id":"sha256:6e8dacfd7efa52ecee3dcc66a2417662403a19ad67049f30a7c9e1dfe6c3e6d9","target":"graph","created_at":"2026-05-18T02:40:45Z","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 introduces a novel technique for access by a cognitive Secondary User (SU) using best-effort transmission to a spectrum with an incumbent Primary User (PU), which uses Type-I Hybrid ARQ. The technique leverages the primary ARQ protocol to perform Interference Cancellation (IC) at the SU receiver (SUrx). Two IC mechanisms that work in concert are introduced: Forward IC, where SUrx, after decoding the PU message, cancels its interference in the (possible) following PU retransmissions of the same message, to improve the SU throughput; Backward IC, where SUrx performs IC on previous SU ","authors_text":"Marco Levorato, Michele Zorzi, Nicol\\`o Michelusi, Osvaldo Simeone, Petar Popovski","cross_cats":["cs.SY","math.IT"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2013-01-30T17:33:36Z","title":"Cognitive Access Policies under a Primary ARQ process via Forward-Backward Interference Cancellation"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1302.1079","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:c556be2db95bc5b518da5e51aff657e2aaac6ff8f7c42d938d7b8069c9f26860","target":"record","created_at":"2026-05-18T02:40:45Z","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":"5a62400ebb695b96ee4df87c1dcf2a689fb2eaf1cd9158acd2898a2783003e2f","cross_cats_sorted":["cs.SY","math.IT"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2013-01-30T17:33:36Z","title_canon_sha256":"c0c9cd18b58096e8700c6a96e3813378f35b5fb56cbfd6396aad50934bc2a2fa"},"schema_version":"1.0","source":{"id":"1302.1079","kind":"arxiv","version":1}},"canonical_sha256":"b5a3f78f70f068aaf22ea2586958f3fa813e269925539dee7a8cb6991c8932da","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"b5a3f78f70f068aaf22ea2586958f3fa813e269925539dee7a8cb6991c8932da","first_computed_at":"2026-05-18T02:40:45.840331Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:40:45.840331Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"/gDBfIMYb5/5zuiwphkfoIx3aita6+Mgg9ikkUR3DHLTok6ZK/c0JfhW92txmsjplPUT9H9dyzYy2cPFkKP2Bw==","signature_status":"signed_v1","signed_at":"2026-05-18T02:40:45.840756Z","signed_message":"canonical_sha256_bytes"},"source_id":"1302.1079","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:c556be2db95bc5b518da5e51aff657e2aaac6ff8f7c42d938d7b8069c9f26860","sha256:6e8dacfd7efa52ecee3dcc66a2417662403a19ad67049f30a7c9e1dfe6c3e6d9"],"state_sha256":"c02799612d42928fbb3ade8f6a6c35894a101d743c192476f46cb5d4cec95965"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"2oLV4yogCiGujt2s94ITNDbISf9zTNgXmm5+ZxV2Zh7NtVdlEYXI7aCWfAtPzEXfs3dX2nU4RSuaZmnai5xwBA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-25T17:57:48.587207Z","bundle_sha256":"1adc3b82a2ec2bc642b0620167f453143929c1e023444bb2ff6307a709ef63ac"}}