{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2013:ZRIBYEWFJFYRA63APW52XGS6SB","short_pith_number":"pith:ZRIBYEWF","canonical_record":{"source":{"id":"1308.2725","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2013-08-13T00:32:22Z","cross_cats_sorted":["math.IT"],"title_canon_sha256":"d24b8635dba842d9c0e65c69157bab51c5991e527c8f6ab1789a65f7ea3e46d3","abstract_canon_sha256":"941b7efce0631b63d443e391c0e9647873f4a5d9b4dd2ba9c2a5b78c5f81910d"},"schema_version":"1.0"},"canonical_sha256":"cc501c12c54971107b607dbbab9a5e905fddd5cf07b846c28991fdc6d223da50","source":{"kind":"arxiv","id":"1308.2725","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1308.2725","created_at":"2026-05-18T03:16:05Z"},{"alias_kind":"arxiv_version","alias_value":"1308.2725v1","created_at":"2026-05-18T03:16:05Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1308.2725","created_at":"2026-05-18T03:16:05Z"},{"alias_kind":"pith_short_12","alias_value":"ZRIBYEWFJFYR","created_at":"2026-05-18T12:28:09Z"},{"alias_kind":"pith_short_16","alias_value":"ZRIBYEWFJFYRA63A","created_at":"2026-05-18T12:28:09Z"},{"alias_kind":"pith_short_8","alias_value":"ZRIBYEWF","created_at":"2026-05-18T12:28:09Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2013:ZRIBYEWFJFYRA63APW52XGS6SB","target":"record","payload":{"canonical_record":{"source":{"id":"1308.2725","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2013-08-13T00:32:22Z","cross_cats_sorted":["math.IT"],"title_canon_sha256":"d24b8635dba842d9c0e65c69157bab51c5991e527c8f6ab1789a65f7ea3e46d3","abstract_canon_sha256":"941b7efce0631b63d443e391c0e9647873f4a5d9b4dd2ba9c2a5b78c5f81910d"},"schema_version":"1.0"},"canonical_sha256":"cc501c12c54971107b607dbbab9a5e905fddd5cf07b846c28991fdc6d223da50","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T03:16:05.384926Z","signature_b64":"UnIlUfwgJ/dr9KQwDP8dwBiMIJI3ODA7T9bkQsEVOr9Aa0NuRkGyeUgF0JQ0RmAo30TdoPrvZcPwGr5J7LliCQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"cc501c12c54971107b607dbbab9a5e905fddd5cf07b846c28991fdc6d223da50","last_reissued_at":"2026-05-18T03:16:05.384429Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T03:16:05.384429Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1308.2725","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":"2026-05-18T03:16:05Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"HAfLseZD1SaqjehLQUU2zo9GcxUi0EMrvJTT03YigEPPX3xTrLpwryGOf7J+eZJl2e0/s73mwm9adtZcMPRDAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-20T10:43:27.708205Z"},"content_sha256":"1ec281c0941324531b36e122d05bf1a13dffdba4586e67d9d22039750617d5ce","schema_version":"1.0","event_id":"sha256:1ec281c0941324531b36e122d05bf1a13dffdba4586e67d9d22039750617d5ce"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2013:ZRIBYEWFJFYRA63APW52XGS6SB","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Adaptive and Iterative Multi-Branch MMSE Decision Feedback Detection Algorithms for MIMO Systems","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["math.IT"],"primary_cat":"cs.IT","authors_text":"R. C. de Lamare","submitted_at":"2013-08-13T00:32:22Z","abstract_excerpt":"In this work, decision feedback (DF) detection algorithms based on multiple processing branches for multi-input multi-output (MIMO) spatial multiplexing systems are proposed. The proposed detector employs multiple cancellation branches with receive filters that are obtained from a common matrix inverse and achieves a performance close to the maximum likelihood detector (MLD). Constrained minimum mean-squared error (MMSE) receive filters designed with constraints on the shape and magnitude of the feedback filters for the multi-branch MMSE DF (MB-MMSE-DF) receivers are presented. An adaptive imp"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1308.2725","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":"2026-05-18T03:16:05Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"biPxiBzH6jcSX/JIhdpyOtiZ80o+LwO0kjlSOF1DlTr0nAk3wGGhf1LT6fIH7JMQBzCGRhDdcQOasRcXADQgDA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-20T10:43:27.708580Z"},"content_sha256":"6f465eb90b3b9624bb82a593e86bb0fde29dd45da6a44df4567e82b27bc79030","schema_version":"1.0","event_id":"sha256:6f465eb90b3b9624bb82a593e86bb0fde29dd45da6a44df4567e82b27bc79030"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/ZRIBYEWFJFYRA63APW52XGS6SB/bundle.json","state_url":"https://pith.science/pith/ZRIBYEWFJFYRA63APW52XGS6SB/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/ZRIBYEWFJFYRA63APW52XGS6SB/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":"2026-05-20T10:43:27Z","links":{"resolver":"https://pith.science/pith/ZRIBYEWFJFYRA63APW52XGS6SB","bundle":"https://pith.science/pith/ZRIBYEWFJFYRA63APW52XGS6SB/bundle.json","state":"https://pith.science/pith/ZRIBYEWFJFYRA63APW52XGS6SB/state.json","well_known_bundle":"https://pith.science/.well-known/pith/ZRIBYEWFJFYRA63APW52XGS6SB/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2013:ZRIBYEWFJFYRA63APW52XGS6SB","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":"941b7efce0631b63d443e391c0e9647873f4a5d9b4dd2ba9c2a5b78c5f81910d","cross_cats_sorted":["math.IT"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2013-08-13T00:32:22Z","title_canon_sha256":"d24b8635dba842d9c0e65c69157bab51c5991e527c8f6ab1789a65f7ea3e46d3"},"schema_version":"1.0","source":{"id":"1308.2725","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1308.2725","created_at":"2026-05-18T03:16:05Z"},{"alias_kind":"arxiv_version","alias_value":"1308.2725v1","created_at":"2026-05-18T03:16:05Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1308.2725","created_at":"2026-05-18T03:16:05Z"},{"alias_kind":"pith_short_12","alias_value":"ZRIBYEWFJFYR","created_at":"2026-05-18T12:28:09Z"},{"alias_kind":"pith_short_16","alias_value":"ZRIBYEWFJFYRA63A","created_at":"2026-05-18T12:28:09Z"},{"alias_kind":"pith_short_8","alias_value":"ZRIBYEWF","created_at":"2026-05-18T12:28:09Z"}],"graph_snapshots":[{"event_id":"sha256:6f465eb90b3b9624bb82a593e86bb0fde29dd45da6a44df4567e82b27bc79030","target":"graph","created_at":"2026-05-18T03:16:05Z","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, decision feedback (DF) detection algorithms based on multiple processing branches for multi-input multi-output (MIMO) spatial multiplexing systems are proposed. The proposed detector employs multiple cancellation branches with receive filters that are obtained from a common matrix inverse and achieves a performance close to the maximum likelihood detector (MLD). Constrained minimum mean-squared error (MMSE) receive filters designed with constraints on the shape and magnitude of the feedback filters for the multi-branch MMSE DF (MB-MMSE-DF) receivers are presented. An adaptive imp","authors_text":"R. C. de Lamare","cross_cats":["math.IT"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2013-08-13T00:32:22Z","title":"Adaptive and Iterative Multi-Branch MMSE Decision Feedback Detection Algorithms for MIMO Systems"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1308.2725","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":"sha256:1ec281c0941324531b36e122d05bf1a13dffdba4586e67d9d22039750617d5ce","target":"record","created_at":"2026-05-18T03:16:05Z","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":"941b7efce0631b63d443e391c0e9647873f4a5d9b4dd2ba9c2a5b78c5f81910d","cross_cats_sorted":["math.IT"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2013-08-13T00:32:22Z","title_canon_sha256":"d24b8635dba842d9c0e65c69157bab51c5991e527c8f6ab1789a65f7ea3e46d3"},"schema_version":"1.0","source":{"id":"1308.2725","kind":"arxiv","version":1}},"canonical_sha256":"cc501c12c54971107b607dbbab9a5e905fddd5cf07b846c28991fdc6d223da50","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"cc501c12c54971107b607dbbab9a5e905fddd5cf07b846c28991fdc6d223da50","first_computed_at":"2026-05-18T03:16:05.384429Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T03:16:05.384429Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"UnIlUfwgJ/dr9KQwDP8dwBiMIJI3ODA7T9bkQsEVOr9Aa0NuRkGyeUgF0JQ0RmAo30TdoPrvZcPwGr5J7LliCQ==","signature_status":"signed_v1","signed_at":"2026-05-18T03:16:05.384926Z","signed_message":"canonical_sha256_bytes"},"source_id":"1308.2725","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:1ec281c0941324531b36e122d05bf1a13dffdba4586e67d9d22039750617d5ce","sha256:6f465eb90b3b9624bb82a593e86bb0fde29dd45da6a44df4567e82b27bc79030"],"state_sha256":"179cd905496ee1c4fc52014e4add821b9fb1dcf27d68b5dbd86e96b10cbdf9e1"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"KwRkkCRx9lueYWs1UFHMwS9S5PoErwVST1Aq13WFOtYk7gV7jHm7qsrDSBW8FE/1Q9RL6tVdsmEsryW6ZrdpAA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-20T10:43:27.710539Z","bundle_sha256":"9dcb4f86bc8d2c0d23bf91c9a3e2e61c2510c41ccfbd3d21cd20f924c5516449"}}