{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2013:ETCBR3DVOKIVMNTMVWH3FFJQVG","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":"4d37ea64b886ed2c930997e2307f85e614344a3b27f8bad5c342c35468e16234","cross_cats_sorted":["math.IT"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2013-01-22T02:31:43Z","title_canon_sha256":"d9070a1475e07eab7483a2e1850be904408722f65cb46134973063904bd14ea0"},"schema_version":"1.0","source":{"id":"1301.5061","kind":"arxiv","version":4}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1301.5061","created_at":"2026-05-18T03:30:02Z"},{"alias_kind":"arxiv_version","alias_value":"1301.5061v4","created_at":"2026-05-18T03:30:02Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1301.5061","created_at":"2026-05-18T03:30:02Z"},{"alias_kind":"pith_short_12","alias_value":"ETCBR3DVOKIV","created_at":"2026-05-18T12:27:43Z"},{"alias_kind":"pith_short_16","alias_value":"ETCBR3DVOKIVMNTM","created_at":"2026-05-18T12:27:43Z"},{"alias_kind":"pith_short_8","alias_value":"ETCBR3DV","created_at":"2026-05-18T12:27:43Z"}],"graph_snapshots":[{"event_id":"sha256:db89663f4554ef4ff84912557b3bba13e15586b182ac7b63cf561407d89dc51d","target":"graph","created_at":"2026-05-18T03:30:02Z","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 paper, we consider two-way orthogonal frequency division multiplexing (OFDM) relay channels, where the direct link between the two terminal nodes is too weak to be used for data transmission. The widely known per-subcarrier decode-and-forward (DF) relay strategy, treats each subcarrier as a separate channel, and performs independent channel coding over each subcarrier. We show that this per-subcarrier DF relay strategy is only a suboptimal DF relay strategy, and present a multi-subcarrier DF relay strategy which utilizes cross-subcarrier channel coding to achieve a larger rate region. ","authors_text":"Chong-Yung Chi, Fei He, Limin Xiao, Shidong Zhou, Xiang Chen, Yin Sun","cross_cats":["math.IT"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2013-01-22T02:31:43Z","title":"Capacity Region Bounds and Resource Allocation for Two-Way OFDM Relay Channels"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1301.5061","kind":"arxiv","version":4},"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":"sha256:2fe8fc0c949a1522385b0c76f54c38b8e0b63a40af8a972da09bb9a8792a05c6","target":"record","created_at":"2026-05-18T03:30:02Z","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":"4d37ea64b886ed2c930997e2307f85e614344a3b27f8bad5c342c35468e16234","cross_cats_sorted":["math.IT"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2013-01-22T02:31:43Z","title_canon_sha256":"d9070a1475e07eab7483a2e1850be904408722f65cb46134973063904bd14ea0"},"schema_version":"1.0","source":{"id":"1301.5061","kind":"arxiv","version":4}},"canonical_sha256":"24c418ec75729156366cad8fb29530a999e931ff5cedaecd2fb08a07baf1da3e","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"24c418ec75729156366cad8fb29530a999e931ff5cedaecd2fb08a07baf1da3e","first_computed_at":"2026-05-18T03:30:02.033755Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T03:30:02.033755Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"4MB8fwKvBmcaVhoeAZzxDgFUH/KZZdTF1MpEGTHExOGQqBu02fFtsd7EEUX3PgVGVsPKBUB3YcMckHhgV1Y8Dw==","signature_status":"signed_v1","signed_at":"2026-05-18T03:30:02.034511Z","signed_message":"canonical_sha256_bytes"},"source_id":"1301.5061","source_kind":"arxiv","source_version":4}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:2fe8fc0c949a1522385b0c76f54c38b8e0b63a40af8a972da09bb9a8792a05c6","sha256:db89663f4554ef4ff84912557b3bba13e15586b182ac7b63cf561407d89dc51d"],"state_sha256":"d4032bfe49a19cc178785d7e5b300a0dad61e65d65b6cadcaedd763331b9aa5e"}