{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2014:KOLK3VSKCQLVOE532BKHGVMWEC","short_pith_number":"pith:KOLK3VSK","canonical_record":{"source":{"id":"1408.4853","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2014-08-21T01:28:38Z","cross_cats_sorted":["math.IT"],"title_canon_sha256":"55b1151d3b155a50357e1379d8b794d552cfbda2f62fb0af344ea43738a8db76","abstract_canon_sha256":"1e2b4525be36fb85b97a04f7c3d9e4554eb7c75ae53c970523b63954533c636f"},"schema_version":"1.0"},"canonical_sha256":"5396add64a14175713bbd05473559620b8cf07c8ba76d92b30cfbce2e076831c","source":{"kind":"arxiv","id":"1408.4853","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1408.4853","created_at":"2026-05-18T02:44:41Z"},{"alias_kind":"arxiv_version","alias_value":"1408.4853v1","created_at":"2026-05-18T02:44:41Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1408.4853","created_at":"2026-05-18T02:44:41Z"},{"alias_kind":"pith_short_12","alias_value":"KOLK3VSKCQLV","created_at":"2026-05-18T12:28:35Z"},{"alias_kind":"pith_short_16","alias_value":"KOLK3VSKCQLVOE53","created_at":"2026-05-18T12:28:35Z"},{"alias_kind":"pith_short_8","alias_value":"KOLK3VSK","created_at":"2026-05-18T12:28:35Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2014:KOLK3VSKCQLVOE532BKHGVMWEC","target":"record","payload":{"canonical_record":{"source":{"id":"1408.4853","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2014-08-21T01:28:38Z","cross_cats_sorted":["math.IT"],"title_canon_sha256":"55b1151d3b155a50357e1379d8b794d552cfbda2f62fb0af344ea43738a8db76","abstract_canon_sha256":"1e2b4525be36fb85b97a04f7c3d9e4554eb7c75ae53c970523b63954533c636f"},"schema_version":"1.0"},"canonical_sha256":"5396add64a14175713bbd05473559620b8cf07c8ba76d92b30cfbce2e076831c","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:44:41.596383Z","signature_b64":"YikSt12Pra9Ruwbn3pJEV8hTfPovGZ+riBACH+dH1rcdCy6mUfL4OpWls+mIvfo/4iKVliZTaLbNhR/lHJIcCA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"5396add64a14175713bbd05473559620b8cf07c8ba76d92b30cfbce2e076831c","last_reissued_at":"2026-05-18T02:44:41.595927Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:44:41.595927Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1408.4853","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":"2026-05-18T02:44:41Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"1RhE7JUazxdkrYPEXhTzSinhDNkEBcq+WWWn38PlHCU6GLBxIvew80cSnva76I8RapiBOXXVpQU0ipfUpoM7DQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-21T11:18:31.474997Z"},"content_sha256":"7ad1fae9e3d81acb6f8b336aef4df04ef3b2a54be91e01a3b4d1a245e5214fe4","schema_version":"1.0","event_id":"sha256:7ad1fae9e3d81acb6f8b336aef4df04ef3b2a54be91e01a3b4d1a245e5214fe4"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2014:KOLK3VSKCQLVOE532BKHGVMWEC","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Detection and Estimation Algorithms in Massive 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, R. Sampaio Neto","submitted_at":"2014-08-21T01:28:38Z","abstract_excerpt":"This book chapter reviews signal detection and parameter estimation techniques for multiuser multiple-antenna wireless systems with a very large number of antennas, known as massive multi-input multi-output (MIMO) systems. We consider both centralized antenna systems (CAS) and distributed antenna systems (DAS) architectures in which a large number of antenna elements are employed and focus on the uplink of a mobile cellular system. In particular, we focus on receive processing techniques that include signal detection and parameter estimation problems and discuss the specific needs of massive M"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1408.4853","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":"2026-05-18T02:44:41Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"NV3MBV43PhEwKWolwe3YChUd2lCD8SdrRyVGVCYvizGOnikZPTldjzmnlOWePA+QSX3zy51sv/4ewigivTjDCQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-21T11:18:31.475372Z"},"content_sha256":"5a36c56010794b4adecf5b7bf058b87431d62e33becc07276612ffaae6359670","schema_version":"1.0","event_id":"sha256:5a36c56010794b4adecf5b7bf058b87431d62e33becc07276612ffaae6359670"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/KOLK3VSKCQLVOE532BKHGVMWEC/bundle.json","state_url":"https://pith.science/pith/KOLK3VSKCQLVOE532BKHGVMWEC/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/KOLK3VSKCQLVOE532BKHGVMWEC/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":"2026-05-21T11:18:31Z","links":{"resolver":"https://pith.science/pith/KOLK3VSKCQLVOE532BKHGVMWEC","bundle":"https://pith.science/pith/KOLK3VSKCQLVOE532BKHGVMWEC/bundle.json","state":"https://pith.science/pith/KOLK3VSKCQLVOE532BKHGVMWEC/state.json","well_known_bundle":"https://pith.science/.well-known/pith/KOLK3VSKCQLVOE532BKHGVMWEC/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2014:KOLK3VSKCQLVOE532BKHGVMWEC","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":"1e2b4525be36fb85b97a04f7c3d9e4554eb7c75ae53c970523b63954533c636f","cross_cats_sorted":["math.IT"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2014-08-21T01:28:38Z","title_canon_sha256":"55b1151d3b155a50357e1379d8b794d552cfbda2f62fb0af344ea43738a8db76"},"schema_version":"1.0","source":{"id":"1408.4853","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1408.4853","created_at":"2026-05-18T02:44:41Z"},{"alias_kind":"arxiv_version","alias_value":"1408.4853v1","created_at":"2026-05-18T02:44:41Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1408.4853","created_at":"2026-05-18T02:44:41Z"},{"alias_kind":"pith_short_12","alias_value":"KOLK3VSKCQLV","created_at":"2026-05-18T12:28:35Z"},{"alias_kind":"pith_short_16","alias_value":"KOLK3VSKCQLVOE53","created_at":"2026-05-18T12:28:35Z"},{"alias_kind":"pith_short_8","alias_value":"KOLK3VSK","created_at":"2026-05-18T12:28:35Z"}],"graph_snapshots":[{"event_id":"sha256:5a36c56010794b4adecf5b7bf058b87431d62e33becc07276612ffaae6359670","target":"graph","created_at":"2026-05-18T02:44:41Z","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":"This book chapter reviews signal detection and parameter estimation techniques for multiuser multiple-antenna wireless systems with a very large number of antennas, known as massive multi-input multi-output (MIMO) systems. We consider both centralized antenna systems (CAS) and distributed antenna systems (DAS) architectures in which a large number of antenna elements are employed and focus on the uplink of a mobile cellular system. In particular, we focus on receive processing techniques that include signal detection and parameter estimation problems and discuss the specific needs of massive M","authors_text":"R. C. de Lamare, R. Sampaio Neto","cross_cats":["math.IT"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2014-08-21T01:28:38Z","title":"Detection and Estimation Algorithms in Massive MIMO Systems"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1408.4853","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":"sha256:7ad1fae9e3d81acb6f8b336aef4df04ef3b2a54be91e01a3b4d1a245e5214fe4","target":"record","created_at":"2026-05-18T02:44:41Z","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":"1e2b4525be36fb85b97a04f7c3d9e4554eb7c75ae53c970523b63954533c636f","cross_cats_sorted":["math.IT"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2014-08-21T01:28:38Z","title_canon_sha256":"55b1151d3b155a50357e1379d8b794d552cfbda2f62fb0af344ea43738a8db76"},"schema_version":"1.0","source":{"id":"1408.4853","kind":"arxiv","version":1}},"canonical_sha256":"5396add64a14175713bbd05473559620b8cf07c8ba76d92b30cfbce2e076831c","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"5396add64a14175713bbd05473559620b8cf07c8ba76d92b30cfbce2e076831c","first_computed_at":"2026-05-18T02:44:41.595927Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:44:41.595927Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"YikSt12Pra9Ruwbn3pJEV8hTfPovGZ+riBACH+dH1rcdCy6mUfL4OpWls+mIvfo/4iKVliZTaLbNhR/lHJIcCA==","signature_status":"signed_v1","signed_at":"2026-05-18T02:44:41.596383Z","signed_message":"canonical_sha256_bytes"},"source_id":"1408.4853","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:7ad1fae9e3d81acb6f8b336aef4df04ef3b2a54be91e01a3b4d1a245e5214fe4","sha256:5a36c56010794b4adecf5b7bf058b87431d62e33becc07276612ffaae6359670"],"state_sha256":"2be504e046096bdc273f8eb79e15254dfd1e426a134a61e8e67f8fc6713b5d4a"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"VL01meKY+ZAFr4njtchCQZBdgXWGYOksvUopf+7BUMP0o05epgKORWF9mVaKvdtun346yvId0RuMGRgrJ4fPDA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-21T11:18:31.477425Z","bundle_sha256":"a4bcbb3653f7c2d584ea5fba063a77ee87b881700472afa85be529c12d725050"}}