{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2012:HITC6Z6YZ3FOMNYGIALBS22F7V","short_pith_number":"pith:HITC6Z6Y","canonical_record":{"source":{"id":"1204.3997","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2012-04-18T07:33:56Z","cross_cats_sorted":["math.IT"],"title_canon_sha256":"2dc2d1410df620f9347a7d7fce64fe97bf5de68aaa9cd6eea859e305e5e6d512","abstract_canon_sha256":"b701dc3a0f5737a622774b471d74b5dada8adfd1edae6d3c0f7c4378d2ca7a6c"},"schema_version":"1.0"},"canonical_sha256":"3a262f67d8cecae637064016196b45fd580e599a1100f3cb88d4ccd25843df5c","source":{"kind":"arxiv","id":"1204.3997","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1204.3997","created_at":"2026-05-18T00:58:43Z"},{"alias_kind":"arxiv_version","alias_value":"1204.3997v1","created_at":"2026-05-18T00:58:43Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1204.3997","created_at":"2026-05-18T00:58:43Z"},{"alias_kind":"pith_short_12","alias_value":"HITC6Z6YZ3FO","created_at":"2026-05-18T12:27:09Z"},{"alias_kind":"pith_short_16","alias_value":"HITC6Z6YZ3FOMNYG","created_at":"2026-05-18T12:27:09Z"},{"alias_kind":"pith_short_8","alias_value":"HITC6Z6Y","created_at":"2026-05-18T12:27:09Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2012:HITC6Z6YZ3FOMNYGIALBS22F7V","target":"record","payload":{"canonical_record":{"source":{"id":"1204.3997","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2012-04-18T07:33:56Z","cross_cats_sorted":["math.IT"],"title_canon_sha256":"2dc2d1410df620f9347a7d7fce64fe97bf5de68aaa9cd6eea859e305e5e6d512","abstract_canon_sha256":"b701dc3a0f5737a622774b471d74b5dada8adfd1edae6d3c0f7c4378d2ca7a6c"},"schema_version":"1.0"},"canonical_sha256":"3a262f67d8cecae637064016196b45fd580e599a1100f3cb88d4ccd25843df5c","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:58:43.091894Z","signature_b64":"fF6SmvG0Q3BRkucP4RTEr/w85m7LDBFSlQ/y7TkixW0gFxGAwTeUAmGdPI/c19QGHhjC6sb3SIWOt2jWId+GAQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"3a262f67d8cecae637064016196b45fd580e599a1100f3cb88d4ccd25843df5c","last_reissued_at":"2026-05-18T00:58:43.091449Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:58:43.091449Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1204.3997","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":"2026-05-18T00:58:43Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"HbQAMLlll5NqZLKKjCkRx6VK7QhEaKa8zNb5luoKwnQ2zMdDd0jGBeo+0hZXUeygkkULHdR54eAijHSuSWmdCA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-27T19:23:26.179197Z"},"content_sha256":"e5608d391b8257271eb6a41eba88f567e476f8701b5a19820ffdeb3181eb8dab","schema_version":"1.0","event_id":"sha256:e5608d391b8257271eb6a41eba88f567e476f8701b5a19820ffdeb3181eb8dab"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2012:HITC6Z6YZ3FOMNYGIALBS22F7V","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"A New Low-Complexity Decodable Rate-5/4 STBC for Four Transmit Antennas with Nonvanishing Determinants","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["math.IT"],"primary_cat":"cs.IT","authors_text":"Amr Ismail, Hikmet Sari, Jocelyn Fiorina","submitted_at":"2012-04-18T07:33:56Z","abstract_excerpt":"The use of Space-Time Block Codes (STBCs) increases significantly the optimal detection complexity at the receiver unless the low-complexity decodability property is taken into consideration in the STBC design. In this paper we propose a new low-complexity decodable rate-5/4 full-diversity 4 x 4 STBC. We provide an analytical proof that the proposed code has the Non-Vanishing-Determinant (NVD) property, a property that can be exploited through the use of adaptive modulation which changes the transmission rate according to the wireless channel quality. We compare the proposed code to the best e"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1204.3997","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":"2026-05-18T00:58:43Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"J+8OgnD74o/Al6h+doXz1TAvBdCHvFGIqabgm4QXUBUXvfKb02zlJA/hHSNxVMrNNfCeAL2vLWYAylcfukvGDQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-27T19:23:26.180088Z"},"content_sha256":"53c58904826626401e253701cf1daf29238f20fffa34cba23b96918c24629bbb","schema_version":"1.0","event_id":"sha256:53c58904826626401e253701cf1daf29238f20fffa34cba23b96918c24629bbb"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/HITC6Z6YZ3FOMNYGIALBS22F7V/bundle.json","state_url":"https://pith.science/pith/HITC6Z6YZ3FOMNYGIALBS22F7V/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/HITC6Z6YZ3FOMNYGIALBS22F7V/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":"2026-05-27T19:23:26Z","links":{"resolver":"https://pith.science/pith/HITC6Z6YZ3FOMNYGIALBS22F7V","bundle":"https://pith.science/pith/HITC6Z6YZ3FOMNYGIALBS22F7V/bundle.json","state":"https://pith.science/pith/HITC6Z6YZ3FOMNYGIALBS22F7V/state.json","well_known_bundle":"https://pith.science/.well-known/pith/HITC6Z6YZ3FOMNYGIALBS22F7V/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2012:HITC6Z6YZ3FOMNYGIALBS22F7V","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":"b701dc3a0f5737a622774b471d74b5dada8adfd1edae6d3c0f7c4378d2ca7a6c","cross_cats_sorted":["math.IT"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2012-04-18T07:33:56Z","title_canon_sha256":"2dc2d1410df620f9347a7d7fce64fe97bf5de68aaa9cd6eea859e305e5e6d512"},"schema_version":"1.0","source":{"id":"1204.3997","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1204.3997","created_at":"2026-05-18T00:58:43Z"},{"alias_kind":"arxiv_version","alias_value":"1204.3997v1","created_at":"2026-05-18T00:58:43Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1204.3997","created_at":"2026-05-18T00:58:43Z"},{"alias_kind":"pith_short_12","alias_value":"HITC6Z6YZ3FO","created_at":"2026-05-18T12:27:09Z"},{"alias_kind":"pith_short_16","alias_value":"HITC6Z6YZ3FOMNYG","created_at":"2026-05-18T12:27:09Z"},{"alias_kind":"pith_short_8","alias_value":"HITC6Z6Y","created_at":"2026-05-18T12:27:09Z"}],"graph_snapshots":[{"event_id":"sha256:53c58904826626401e253701cf1daf29238f20fffa34cba23b96918c24629bbb","target":"graph","created_at":"2026-05-18T00:58:43Z","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":"The use of Space-Time Block Codes (STBCs) increases significantly the optimal detection complexity at the receiver unless the low-complexity decodability property is taken into consideration in the STBC design. In this paper we propose a new low-complexity decodable rate-5/4 full-diversity 4 x 4 STBC. We provide an analytical proof that the proposed code has the Non-Vanishing-Determinant (NVD) property, a property that can be exploited through the use of adaptive modulation which changes the transmission rate according to the wireless channel quality. We compare the proposed code to the best e","authors_text":"Amr Ismail, Hikmet Sari, Jocelyn Fiorina","cross_cats":["math.IT"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2012-04-18T07:33:56Z","title":"A New Low-Complexity Decodable Rate-5/4 STBC for Four Transmit Antennas with Nonvanishing Determinants"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1204.3997","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:e5608d391b8257271eb6a41eba88f567e476f8701b5a19820ffdeb3181eb8dab","target":"record","created_at":"2026-05-18T00:58:43Z","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":"b701dc3a0f5737a622774b471d74b5dada8adfd1edae6d3c0f7c4378d2ca7a6c","cross_cats_sorted":["math.IT"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2012-04-18T07:33:56Z","title_canon_sha256":"2dc2d1410df620f9347a7d7fce64fe97bf5de68aaa9cd6eea859e305e5e6d512"},"schema_version":"1.0","source":{"id":"1204.3997","kind":"arxiv","version":1}},"canonical_sha256":"3a262f67d8cecae637064016196b45fd580e599a1100f3cb88d4ccd25843df5c","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"3a262f67d8cecae637064016196b45fd580e599a1100f3cb88d4ccd25843df5c","first_computed_at":"2026-05-18T00:58:43.091449Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:58:43.091449Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"fF6SmvG0Q3BRkucP4RTEr/w85m7LDBFSlQ/y7TkixW0gFxGAwTeUAmGdPI/c19QGHhjC6sb3SIWOt2jWId+GAQ==","signature_status":"signed_v1","signed_at":"2026-05-18T00:58:43.091894Z","signed_message":"canonical_sha256_bytes"},"source_id":"1204.3997","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:e5608d391b8257271eb6a41eba88f567e476f8701b5a19820ffdeb3181eb8dab","sha256:53c58904826626401e253701cf1daf29238f20fffa34cba23b96918c24629bbb"],"state_sha256":"3e3c8f14d1d665dc0937f6a9561c587f175ceca8ef11a4ef32c0babd2a29df8b"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"2pHTW2pA9KAo56zVDZBx+5wUbwB2sj9z1JCHtuJwb41fccLama+kVWR+1f8CeyKPOgrrjMUj8p38wMSr2zm6Bg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-27T19:23:26.184823Z","bundle_sha256":"cac235976a53400554b62eaf2112e52f8aa8e94c299431de5d68a9eeaf6bc278"}}