{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:3HUAKZVXZMV7UFDBKZQ6FW4D57","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":"385031ce11103de26c3c1c5d95fe9474c190045aeecb2f6ee95373232b538676","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SP","submitted_at":"2018-02-19T13:58:38Z","title_canon_sha256":"f5361da718062bc876f40fdd12563da5d3b1e79a87df287766c59eeb7f426e0a"},"schema_version":"1.0","source":{"id":"1802.07286","kind":"arxiv","version":3}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1802.07286","created_at":"2026-05-18T00:00:21Z"},{"alias_kind":"arxiv_version","alias_value":"1802.07286v3","created_at":"2026-05-18T00:00:21Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1802.07286","created_at":"2026-05-18T00:00:21Z"},{"alias_kind":"pith_short_12","alias_value":"3HUAKZVXZMV7","created_at":"2026-05-18T12:32:02Z"},{"alias_kind":"pith_short_16","alias_value":"3HUAKZVXZMV7UFDB","created_at":"2026-05-18T12:32:02Z"},{"alias_kind":"pith_short_8","alias_value":"3HUAKZVX","created_at":"2026-05-18T12:32:02Z"}],"graph_snapshots":[{"event_id":"sha256:efaea10d96e08711fa2266260fccd45a8bf1133c4dea0bfa430cf1f5df7987c9","target":"graph","created_at":"2026-05-18T00:00:21Z","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":"In this work a novel dual-hop relay-assisted hybrid Free Space Optical / Radio Frequency (FSO / RF) communication system is presented. In this system, RF signal is transmitted from two antennas, and then forwarded by a single antenna relay through FSO channel. This is the first time that performance of using Alamouti Coding (AC) or Antenna Selection (AS) at the transmitter of a hybrid FSO / RF system is investigated. FSO link has Gamma-Gamma atmospheric turbulence, and in order to get closer to the actual results, the effect of pointing error is also considered. For the first time closed-form ","authors_text":"Javad Sayehvand, Mohammad Ali Amirabadi","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SP","submitted_at":"2018-02-19T13:58:38Z","title":"Performance analysis of hybrid FSO/RF communication systems with Alamouti Coding or Antenna Selection"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1802.07286","kind":"arxiv","version":3},"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":"sha256:065672c3298f602c3726a51c6ada55d9da82992fd4560539ad188cd6694592cf","target":"record","created_at":"2026-05-18T00:00:21Z","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":"385031ce11103de26c3c1c5d95fe9474c190045aeecb2f6ee95373232b538676","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SP","submitted_at":"2018-02-19T13:58:38Z","title_canon_sha256":"f5361da718062bc876f40fdd12563da5d3b1e79a87df287766c59eeb7f426e0a"},"schema_version":"1.0","source":{"id":"1802.07286","kind":"arxiv","version":3}},"canonical_sha256":"d9e80566b7cb2bfa14615661e2db83efce4f18c90ccfa3e6c31e1158dec3bad0","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"d9e80566b7cb2bfa14615661e2db83efce4f18c90ccfa3e6c31e1158dec3bad0","first_computed_at":"2026-05-18T00:00:21.915141Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:00:21.915141Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"0ZtW1f9sUOLLMK3jEuAd2JqTONmVhhBMaCWshUzWbFut0t0GIFEtLesOoYgVNmgjs1mcm084/jhqc0qQYsnXBA==","signature_status":"signed_v1","signed_at":"2026-05-18T00:00:21.915781Z","signed_message":"canonical_sha256_bytes"},"source_id":"1802.07286","source_kind":"arxiv","source_version":3}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:065672c3298f602c3726a51c6ada55d9da82992fd4560539ad188cd6694592cf","sha256:efaea10d96e08711fa2266260fccd45a8bf1133c4dea0bfa430cf1f5df7987c9"],"state_sha256":"9d774aa2440829f628baac59579cda3cc96ba2c3e3b7e27bfc93c79682a5db48"}