{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2015:RMY65QDWKK2DC2BMNQ7SZHJFKR","short_pith_number":"pith:RMY65QDW","canonical_record":{"source":{"id":"1505.06729","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2015-05-24T19:08:56Z","cross_cats_sorted":["math.IT"],"title_canon_sha256":"9e1eb24dcab9ab6118b508ff8589cc7670ea067431807875eebde2440e54bc54","abstract_canon_sha256":"b2ae669e539fa462e718a87d506a8c35069239dc9fbbd098a03b2e38d04c89fd"},"schema_version":"1.0"},"canonical_sha256":"8b31eec07652b431682c6c3f2c9d25546accc03bd877fba2b62883887d9673fa","source":{"kind":"arxiv","id":"1505.06729","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1505.06729","created_at":"2026-05-18T02:03:32Z"},{"alias_kind":"arxiv_version","alias_value":"1505.06729v1","created_at":"2026-05-18T02:03:32Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1505.06729","created_at":"2026-05-18T02:03:32Z"},{"alias_kind":"pith_short_12","alias_value":"RMY65QDWKK2D","created_at":"2026-05-18T12:29:39Z"},{"alias_kind":"pith_short_16","alias_value":"RMY65QDWKK2DC2BM","created_at":"2026-05-18T12:29:39Z"},{"alias_kind":"pith_short_8","alias_value":"RMY65QDW","created_at":"2026-05-18T12:29:39Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2015:RMY65QDWKK2DC2BMNQ7SZHJFKR","target":"record","payload":{"canonical_record":{"source":{"id":"1505.06729","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2015-05-24T19:08:56Z","cross_cats_sorted":["math.IT"],"title_canon_sha256":"9e1eb24dcab9ab6118b508ff8589cc7670ea067431807875eebde2440e54bc54","abstract_canon_sha256":"b2ae669e539fa462e718a87d506a8c35069239dc9fbbd098a03b2e38d04c89fd"},"schema_version":"1.0"},"canonical_sha256":"8b31eec07652b431682c6c3f2c9d25546accc03bd877fba2b62883887d9673fa","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:03:32.013425Z","signature_b64":"/fJjc5bdPAZYKA4tUF5yNb7YvjfKOwkSmSCDE8XAYC8XQYp3w9J1GibLp9qGF/uzPPBBHitTTszCrxirgEPMBA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"8b31eec07652b431682c6c3f2c9d25546accc03bd877fba2b62883887d9673fa","last_reissued_at":"2026-05-18T02:03:32.012741Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:03:32.012741Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1505.06729","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":"2026-05-18T02:03:32Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"dWH0Ai6MuuQNmPvzijRb8tFuCzzWM5Hl+U5VZZxWid4gMBtuwtcmYsvSEJhHyu0ysRKq34dQuPuI04ZMIjgXBw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-28T10:33:05.745529Z"},"content_sha256":"d4ef9f8b7a559c605b3970309ed3675a6edde55857a98962ecdeef0c50d92535","schema_version":"1.0","event_id":"sha256:d4ef9f8b7a559c605b3970309ed3675a6edde55857a98962ecdeef0c50d92535"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2015:RMY65QDWKK2DC2BMNQ7SZHJFKR","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"High Rate/Low Complexity Space-Time Block Codes for 2x2 Reconfigurable MIMO Systems","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["math.IT"],"primary_cat":"cs.IT","authors_text":"Hamid Jafarkhani, Hani Mehrpouyan, Vida Vakilian, Yingbo Hua","submitted_at":"2015-05-24T19:08:56Z","abstract_excerpt":"In this paper, we propose a full-rate full-diversity space-time block code (STBC) for 2x2 reconfigurable multiple-input multiple-output (MIMO) systems that require a low complexity maximum likelihood (ML) detector. We consider a transmitter equipped with a linear antenna array where each antenna element can be independently configured to create a directive radiation pattern toward a selected direction. This property of transmit antennas allow us to increase the data rate of the system, while reducing the computational complexity of the receiver. The proposed STBC achieves a coding rate of two "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1505.06729","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":"2026-05-18T02:03:32Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"z9VuQssi+XwOfblT7044eOHNCaZZ+IIJ83q5RfDWHu26gKBJ06wnRd5JiZcBlC0JJUg/WAcAv4+spwORa63cBA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-28T10:33:05.745928Z"},"content_sha256":"11a840b1f4d72596192c0f351c4c10d71edb18de2d0ff51749c6fff2f5a6919b","schema_version":"1.0","event_id":"sha256:11a840b1f4d72596192c0f351c4c10d71edb18de2d0ff51749c6fff2f5a6919b"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/RMY65QDWKK2DC2BMNQ7SZHJFKR/bundle.json","state_url":"https://pith.science/pith/RMY65QDWKK2DC2BMNQ7SZHJFKR/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/RMY65QDWKK2DC2BMNQ7SZHJFKR/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":"2026-05-28T10:33:05Z","links":{"resolver":"https://pith.science/pith/RMY65QDWKK2DC2BMNQ7SZHJFKR","bundle":"https://pith.science/pith/RMY65QDWKK2DC2BMNQ7SZHJFKR/bundle.json","state":"https://pith.science/pith/RMY65QDWKK2DC2BMNQ7SZHJFKR/state.json","well_known_bundle":"https://pith.science/.well-known/pith/RMY65QDWKK2DC2BMNQ7SZHJFKR/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2015:RMY65QDWKK2DC2BMNQ7SZHJFKR","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":"b2ae669e539fa462e718a87d506a8c35069239dc9fbbd098a03b2e38d04c89fd","cross_cats_sorted":["math.IT"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2015-05-24T19:08:56Z","title_canon_sha256":"9e1eb24dcab9ab6118b508ff8589cc7670ea067431807875eebde2440e54bc54"},"schema_version":"1.0","source":{"id":"1505.06729","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1505.06729","created_at":"2026-05-18T02:03:32Z"},{"alias_kind":"arxiv_version","alias_value":"1505.06729v1","created_at":"2026-05-18T02:03:32Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1505.06729","created_at":"2026-05-18T02:03:32Z"},{"alias_kind":"pith_short_12","alias_value":"RMY65QDWKK2D","created_at":"2026-05-18T12:29:39Z"},{"alias_kind":"pith_short_16","alias_value":"RMY65QDWKK2DC2BM","created_at":"2026-05-18T12:29:39Z"},{"alias_kind":"pith_short_8","alias_value":"RMY65QDW","created_at":"2026-05-18T12:29:39Z"}],"graph_snapshots":[{"event_id":"sha256:11a840b1f4d72596192c0f351c4c10d71edb18de2d0ff51749c6fff2f5a6919b","target":"graph","created_at":"2026-05-18T02:03:32Z","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 propose a full-rate full-diversity space-time block code (STBC) for 2x2 reconfigurable multiple-input multiple-output (MIMO) systems that require a low complexity maximum likelihood (ML) detector. We consider a transmitter equipped with a linear antenna array where each antenna element can be independently configured to create a directive radiation pattern toward a selected direction. This property of transmit antennas allow us to increase the data rate of the system, while reducing the computational complexity of the receiver. The proposed STBC achieves a coding rate of two ","authors_text":"Hamid Jafarkhani, Hani Mehrpouyan, Vida Vakilian, Yingbo Hua","cross_cats":["math.IT"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2015-05-24T19:08:56Z","title":"High Rate/Low Complexity Space-Time Block Codes for 2x2 Reconfigurable MIMO Systems"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1505.06729","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:d4ef9f8b7a559c605b3970309ed3675a6edde55857a98962ecdeef0c50d92535","target":"record","created_at":"2026-05-18T02:03:32Z","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":"b2ae669e539fa462e718a87d506a8c35069239dc9fbbd098a03b2e38d04c89fd","cross_cats_sorted":["math.IT"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2015-05-24T19:08:56Z","title_canon_sha256":"9e1eb24dcab9ab6118b508ff8589cc7670ea067431807875eebde2440e54bc54"},"schema_version":"1.0","source":{"id":"1505.06729","kind":"arxiv","version":1}},"canonical_sha256":"8b31eec07652b431682c6c3f2c9d25546accc03bd877fba2b62883887d9673fa","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"8b31eec07652b431682c6c3f2c9d25546accc03bd877fba2b62883887d9673fa","first_computed_at":"2026-05-18T02:03:32.012741Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:03:32.012741Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"/fJjc5bdPAZYKA4tUF5yNb7YvjfKOwkSmSCDE8XAYC8XQYp3w9J1GibLp9qGF/uzPPBBHitTTszCrxirgEPMBA==","signature_status":"signed_v1","signed_at":"2026-05-18T02:03:32.013425Z","signed_message":"canonical_sha256_bytes"},"source_id":"1505.06729","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:d4ef9f8b7a559c605b3970309ed3675a6edde55857a98962ecdeef0c50d92535","sha256:11a840b1f4d72596192c0f351c4c10d71edb18de2d0ff51749c6fff2f5a6919b"],"state_sha256":"5b56ac77556cb4a5084ef98dab8c4d031a495547da795acfc7c4d9c5c158f537"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"mWo4dgTzYmM0+Ae24KAEDGpBii521egNR6f1oYNnolQMOZ+HpjE3612EKnGL2Dr3bhpysiK7/kzRKty2Zz8oCA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-28T10:33:05.748706Z","bundle_sha256":"818c9e41c35ddd019e49aec500092ef1534261d538936ab750a5ab551f429392"}}