{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2023:W7I54AIEUEVRPM6FCYNUBVU7YW","short_pith_number":"pith:W7I54AIE","canonical_record":{"source":{"id":"2304.04492","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"eess.SP","submitted_at":"2023-04-10T10:10:31Z","cross_cats_sorted":[],"title_canon_sha256":"b69843a4f15c7f30c15e1be8dbf3fd95ca6709799cd76eb3fc6f503404e10993","abstract_canon_sha256":"c71611e39ac01637e9b87fd7d71c9661a4d466eae10a7d1fb0c4326db27a232a"},"schema_version":"1.0"},"canonical_sha256":"b7d1de0104a12b17b3c5161b40d69fc5ad01189f0aab39f8a17712bda2ceb0ca","source":{"kind":"arxiv","id":"2304.04492","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2304.04492","created_at":"2026-07-05T05:59:26Z"},{"alias_kind":"arxiv_version","alias_value":"2304.04492v1","created_at":"2026-07-05T05:59:26Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2304.04492","created_at":"2026-07-05T05:59:26Z"},{"alias_kind":"pith_short_12","alias_value":"W7I54AIEUEVR","created_at":"2026-07-05T05:59:26Z"},{"alias_kind":"pith_short_16","alias_value":"W7I54AIEUEVRPM6F","created_at":"2026-07-05T05:59:26Z"},{"alias_kind":"pith_short_8","alias_value":"W7I54AIE","created_at":"2026-07-05T05:59:26Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2023:W7I54AIEUEVRPM6FCYNUBVU7YW","target":"record","payload":{"canonical_record":{"source":{"id":"2304.04492","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"eess.SP","submitted_at":"2023-04-10T10:10:31Z","cross_cats_sorted":[],"title_canon_sha256":"b69843a4f15c7f30c15e1be8dbf3fd95ca6709799cd76eb3fc6f503404e10993","abstract_canon_sha256":"c71611e39ac01637e9b87fd7d71c9661a4d466eae10a7d1fb0c4326db27a232a"},"schema_version":"1.0"},"canonical_sha256":"b7d1de0104a12b17b3c5161b40d69fc5ad01189f0aab39f8a17712bda2ceb0ca","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T05:59:26.760294Z","signature_b64":"HmCm/+UdYiJ+XP9BFTequGwFlkVpTJ3Eye4fSfcN4ADbVvf7wxzcX5ECWOIrzA1bAXXBlF6p4un/8a7lMpo/DA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"b7d1de0104a12b17b3c5161b40d69fc5ad01189f0aab39f8a17712bda2ceb0ca","last_reissued_at":"2026-07-05T05:59:26.759846Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T05:59:26.759846Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2304.04492","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":"2026-07-05T05:59:26Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"wvRxc+BY2QnJ4cf8IrnDsdJCGlZCFdmr5X8mYQizEE+PZB8lWV2dqpfZHCekAJqupHsDmaVfpLqVFoipwe0+BA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-07T14:42:46.190725Z"},"content_sha256":"8c31eea4ee2806c64aea599d37c3f68232626d008d96fc5dc38c2e857129fa7f","schema_version":"1.0","event_id":"sha256:8c31eea4ee2806c64aea599d37c3f68232626d008d96fc5dc38c2e857129fa7f"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2023:W7I54AIEUEVRPM6FCYNUBVU7YW","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Relay Assisted Multiuser OWC Systems under Human Blockage","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":[],"primary_cat":"eess.SP","authors_text":"Ahmad Qidan, Jaafar M. H. Elmirghani, Sanaa H. Mohamed, Taisir E. H. El-Gorashi, Y. Zeng","submitted_at":"2023-04-10T10:10:31Z","abstract_excerpt":"This paper proposes using cooperative communication based on optoelectronic (O-E-O) amplify-and-forward relay terminals to reduce the influence of the blockage and shadowing resulting from human movement in a beam steering Optical Wireless Communication (OWC) system. The simulation results indicate that on average, the outage probability of the cooperative communication mode with O-E-O relay terminals is two orders of magnitude lower than the outage probability of the system without relay terminals."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2304.04492","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2304.04492/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":"2026-07-05T05:59:26Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"lP+dyBZIxZFI5fFn9a/v/l6GVNF7hLhA8q0hMGJqCyiY26vBCPucCFzLpzHshP0pvUZWddgfhhQMPQ02MsRnCw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-07T14:42:46.191102Z"},"content_sha256":"b04e66b67163fcbb1672d489f38a6754ab5e31cf0bf6cdc812c9ab5c8423007a","schema_version":"1.0","event_id":"sha256:b04e66b67163fcbb1672d489f38a6754ab5e31cf0bf6cdc812c9ab5c8423007a"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/W7I54AIEUEVRPM6FCYNUBVU7YW/bundle.json","state_url":"https://pith.science/pith/W7I54AIEUEVRPM6FCYNUBVU7YW/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/W7I54AIEUEVRPM6FCYNUBVU7YW/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":"2026-07-07T14:42:46Z","links":{"resolver":"https://pith.science/pith/W7I54AIEUEVRPM6FCYNUBVU7YW","bundle":"https://pith.science/pith/W7I54AIEUEVRPM6FCYNUBVU7YW/bundle.json","state":"https://pith.science/pith/W7I54AIEUEVRPM6FCYNUBVU7YW/state.json","well_known_bundle":"https://pith.science/.well-known/pith/W7I54AIEUEVRPM6FCYNUBVU7YW/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2023:W7I54AIEUEVRPM6FCYNUBVU7YW","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":"c71611e39ac01637e9b87fd7d71c9661a4d466eae10a7d1fb0c4326db27a232a","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"eess.SP","submitted_at":"2023-04-10T10:10:31Z","title_canon_sha256":"b69843a4f15c7f30c15e1be8dbf3fd95ca6709799cd76eb3fc6f503404e10993"},"schema_version":"1.0","source":{"id":"2304.04492","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2304.04492","created_at":"2026-07-05T05:59:26Z"},{"alias_kind":"arxiv_version","alias_value":"2304.04492v1","created_at":"2026-07-05T05:59:26Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2304.04492","created_at":"2026-07-05T05:59:26Z"},{"alias_kind":"pith_short_12","alias_value":"W7I54AIEUEVR","created_at":"2026-07-05T05:59:26Z"},{"alias_kind":"pith_short_16","alias_value":"W7I54AIEUEVRPM6F","created_at":"2026-07-05T05:59:26Z"},{"alias_kind":"pith_short_8","alias_value":"W7I54AIE","created_at":"2026-07-05T05:59:26Z"}],"graph_snapshots":[{"event_id":"sha256:b04e66b67163fcbb1672d489f38a6754ab5e31cf0bf6cdc812c9ab5c8423007a","target":"graph","created_at":"2026-07-05T05:59:26Z","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/2304.04492/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"This paper proposes using cooperative communication based on optoelectronic (O-E-O) amplify-and-forward relay terminals to reduce the influence of the blockage and shadowing resulting from human movement in a beam steering Optical Wireless Communication (OWC) system. The simulation results indicate that on average, the outage probability of the cooperative communication mode with O-E-O relay terminals is two orders of magnitude lower than the outage probability of the system without relay terminals.","authors_text":"Ahmad Qidan, Jaafar M. H. Elmirghani, Sanaa H. Mohamed, Taisir E. H. El-Gorashi, Y. Zeng","cross_cats":[],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"eess.SP","submitted_at":"2023-04-10T10:10:31Z","title":"Relay Assisted Multiuser OWC Systems under Human Blockage"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2304.04492","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":"sha256:8c31eea4ee2806c64aea599d37c3f68232626d008d96fc5dc38c2e857129fa7f","target":"record","created_at":"2026-07-05T05:59:26Z","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":"c71611e39ac01637e9b87fd7d71c9661a4d466eae10a7d1fb0c4326db27a232a","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"eess.SP","submitted_at":"2023-04-10T10:10:31Z","title_canon_sha256":"b69843a4f15c7f30c15e1be8dbf3fd95ca6709799cd76eb3fc6f503404e10993"},"schema_version":"1.0","source":{"id":"2304.04492","kind":"arxiv","version":1}},"canonical_sha256":"b7d1de0104a12b17b3c5161b40d69fc5ad01189f0aab39f8a17712bda2ceb0ca","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"b7d1de0104a12b17b3c5161b40d69fc5ad01189f0aab39f8a17712bda2ceb0ca","first_computed_at":"2026-07-05T05:59:26.759846Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T05:59:26.759846Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"HmCm/+UdYiJ+XP9BFTequGwFlkVpTJ3Eye4fSfcN4ADbVvf7wxzcX5ECWOIrzA1bAXXBlF6p4un/8a7lMpo/DA==","signature_status":"signed_v1","signed_at":"2026-07-05T05:59:26.760294Z","signed_message":"canonical_sha256_bytes"},"source_id":"2304.04492","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:8c31eea4ee2806c64aea599d37c3f68232626d008d96fc5dc38c2e857129fa7f","sha256:b04e66b67163fcbb1672d489f38a6754ab5e31cf0bf6cdc812c9ab5c8423007a"],"state_sha256":"7ed951c771a438b34e4a09b279e3b158303b8a8b2eed834cf3f5424965972ef5"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"mUlQDWvNVTq4Ggkl8bYnU79odZu1fFzioiiX1ILpFXV361GhoTFUoDkKXAwI90F810bRS1CtXfwbWjnF6/n1Dw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-07-07T14:42:46.193070Z","bundle_sha256":"a15c7fa676df04cc6062c116756676ff33a9efbb00330a1eaa8de072d691976d"}}