{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2014:C2I3ORPCUEWJN6DBACXQQVURJN","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":"775382e3ca2b0c10fb4022e6a13dd0acbd3465a4081639639552db32b367515b","cross_cats_sorted":["math.IT"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2014-07-24T22:40:12Z","title_canon_sha256":"d3e090dad3ff4180fabe4b0ca3b394ed04b4d98c40bb462a108093e6a6b3041f"},"schema_version":"1.0","source":{"id":"1407.6751","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1407.6751","created_at":"2026-05-18T00:58:11Z"},{"alias_kind":"arxiv_version","alias_value":"1407.6751v1","created_at":"2026-05-18T00:58:11Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1407.6751","created_at":"2026-05-18T00:58:11Z"},{"alias_kind":"pith_short_12","alias_value":"C2I3ORPCUEWJ","created_at":"2026-05-18T12:28:22Z"},{"alias_kind":"pith_short_16","alias_value":"C2I3ORPCUEWJN6DB","created_at":"2026-05-18T12:28:22Z"},{"alias_kind":"pith_short_8","alias_value":"C2I3ORPC","created_at":"2026-05-18T12:28:22Z"}],"graph_snapshots":[{"event_id":"sha256:838001fdc8e9d40496724a5982c21081683ff640db9c7f7de2ce02467cd73360","target":"graph","created_at":"2026-05-18T00:58:11Z","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":"Differential distributed space-time coding (D-DSTC) has been considered to improve both diversity and data-rate in cooperative communications in the absence of channel information. However, conventionally, it is assumed that relays are perfectly synchronized in the symbol level. In practice, this assumption is easily violated due to the distributed nature of the relay networks. This paper proposes a new differential encoding and decoding process for D-DSTC systems with two relays. The proposed method is robust against synchronization errors and does not require any channel information at the d","authors_text":"Hamid Jafarkhani, M. R. Avendi, Sina Poorkasmaei","cross_cats":["math.IT"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2014-07-24T22:40:12Z","title":"Differential Distributed Space-Time Coding with Imperfect Synchronization"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1407.6751","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:e0511a03db30242fe9106c47c701dd0799d9acffb5cfae111efdbd3180d06d3c","target":"record","created_at":"2026-05-18T00:58:11Z","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":"775382e3ca2b0c10fb4022e6a13dd0acbd3465a4081639639552db32b367515b","cross_cats_sorted":["math.IT"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2014-07-24T22:40:12Z","title_canon_sha256":"d3e090dad3ff4180fabe4b0ca3b394ed04b4d98c40bb462a108093e6a6b3041f"},"schema_version":"1.0","source":{"id":"1407.6751","kind":"arxiv","version":1}},"canonical_sha256":"1691b745e2a12c96f86100af0856914b4f3c123935d5738b520f9fdc96cbac81","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"1691b745e2a12c96f86100af0856914b4f3c123935d5738b520f9fdc96cbac81","first_computed_at":"2026-05-18T00:58:11.514127Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:58:11.514127Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"FCwyrlst4K4HD9rcs76ReeCjGZyG08STHHomV3hW9KSCxnkD0WaN7yUR9P2whBUeQGyUGOH6Sj6OeEsk7qliCA==","signature_status":"signed_v1","signed_at":"2026-05-18T00:58:11.514692Z","signed_message":"canonical_sha256_bytes"},"source_id":"1407.6751","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:e0511a03db30242fe9106c47c701dd0799d9acffb5cfae111efdbd3180d06d3c","sha256:838001fdc8e9d40496724a5982c21081683ff640db9c7f7de2ce02467cd73360"],"state_sha256":"2a806b734956f3db298808446e45dbd4b6954cb224c10e273f524effab86b518"}