{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2013:HEDVFV2JVYABCRW2XEC5XZXXTJ","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":"f6bad0baa17cf9c4bda613a3e25e9322882c7e48c4f36d8c2a74639e3c2bafe0","cross_cats_sorted":["math.IT"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2013-04-22T01:09:00Z","title_canon_sha256":"f72a69c73e0a96a089ace312dd632db5d56bd752f10d12c79c80e3dab4d6c005"},"schema_version":"1.0","source":{"id":"1304.5817","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1304.5817","created_at":"2026-05-18T00:58:42Z"},{"alias_kind":"arxiv_version","alias_value":"1304.5817v1","created_at":"2026-05-18T00:58:42Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1304.5817","created_at":"2026-05-18T00:58:42Z"},{"alias_kind":"pith_short_12","alias_value":"HEDVFV2JVYAB","created_at":"2026-05-18T12:27:46Z"},{"alias_kind":"pith_short_16","alias_value":"HEDVFV2JVYABCRW2","created_at":"2026-05-18T12:27:46Z"},{"alias_kind":"pith_short_8","alias_value":"HEDVFV2J","created_at":"2026-05-18T12:27:46Z"}],"graph_snapshots":[{"event_id":"sha256:959828163c4d8864e834c9bc7923ef8eae60bf16c30466d2c28864da6da69ceb","target":"graph","created_at":"2026-05-18T00:58:42Z","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, we propose low-complexity adaptive biased estimation algorithms, called group-based shrinkage estimators (GSEs), for parameter estimation and interference suppression scenarios with mechanisms to automatically adjust the shrinkage factors. The proposed estimation algorithms divide the target parameter vector into a number of groups and adaptively calculate one shrinkage factor for each group. GSE schemes improve the performance of the conventional least squares (LS) estimator in terms of the mean-squared error (MSE), while requiring a very modest increase in complexity. An MSE an","authors_text":"Martin Haardt, Rodrigo C. de Lamare, Sheng Li","cross_cats":["math.IT"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2013-04-22T01:09:00Z","title":"Frequency-Domain Group-based Shrinkage Estimators for UWB Systems"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1304.5817","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:ca7ec4e88cc37e70c0005022e079f2d6bfcb3a1d0550da03af40cf18c2b7109f","target":"record","created_at":"2026-05-18T00:58:42Z","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":"f6bad0baa17cf9c4bda613a3e25e9322882c7e48c4f36d8c2a74639e3c2bafe0","cross_cats_sorted":["math.IT"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2013-04-22T01:09:00Z","title_canon_sha256":"f72a69c73e0a96a089ace312dd632db5d56bd752f10d12c79c80e3dab4d6c005"},"schema_version":"1.0","source":{"id":"1304.5817","kind":"arxiv","version":1}},"canonical_sha256":"390752d749ae001146dab905dbe6f79a67e071bedf13aa0fefe1ced63f13c3b6","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"390752d749ae001146dab905dbe6f79a67e071bedf13aa0fefe1ced63f13c3b6","first_computed_at":"2026-05-18T00:58:42.450082Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:58:42.450082Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"SUX8mWJfoC2jbwozDUuM6C7OepGF/8m/PJu/VqbwAXjjuze3E/4ubaqU2yzIegmJZZOrjhtTEDRJnRiUAg+TBQ==","signature_status":"signed_v1","signed_at":"2026-05-18T00:58:42.450592Z","signed_message":"canonical_sha256_bytes"},"source_id":"1304.5817","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:ca7ec4e88cc37e70c0005022e079f2d6bfcb3a1d0550da03af40cf18c2b7109f","sha256:959828163c4d8864e834c9bc7923ef8eae60bf16c30466d2c28864da6da69ceb"],"state_sha256":"cef31d92f9d27c7ee5bb5c6e0a11dd23556c810576e8c1b4df3f6597a6280bfd"}