{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2017:WSPCUJLY43AK54L5X5SRMJRUQJ","short_pith_number":"pith:WSPCUJLY","schema_version":"1.0","canonical_sha256":"b49e2a2578e6c0aef17dbf65162634826656ae16cd54626dd1052df3f5593a3a","source":{"kind":"arxiv","id":"1709.07722","version":1},"attestation_state":"computed","paper":{"title":"Spectral and Energy Efficiency of Superimposed Pilots in Uplink Massive MIMO","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"eess.SP","authors_text":"Daniel Verenzuela, Emil Bj\\\"ornson, Luca Sanguinetti","submitted_at":"2017-09-22T12:53:18Z","abstract_excerpt":"Next generation wireless networks aim at providing substantial improvements in spectral efficiency (SE) and energy efficiency (EE). Massive MIMO has been proved to be a viable technology to achieve these goals by spatially multiplexing several users using many base station (BS) antennas. A potential limitation of Massive MIMO in multicell systems is pilot contamination, which arises in the channel estimation process from the interference caused by reusing pilots in neighboring cells. A standard method to reduce pilot contamination, known as regular pilot (RP), is to adjust the length of pilot "},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"1709.07722","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SP","submitted_at":"2017-09-22T12:53:18Z","cross_cats_sorted":[],"title_canon_sha256":"76aa5b1bcab4ce41199a2d99943607d0a44d3e04ce43832f483d664856dea19e","abstract_canon_sha256":"21597797525164bdeaad9cdfa76d30b451c3772324ef4d20b97372924b00409e"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:34:32.474448Z","signature_b64":"NA+Pv/ZGWwuf0IaTgEledj3Gn8EDquFCXeoyThhU0Rrx+gMHwHHuIAElGcJLf8mKohQsZnLHYN++wOU8xE4iBQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"b49e2a2578e6c0aef17dbf65162634826656ae16cd54626dd1052df3f5593a3a","last_reissued_at":"2026-05-18T00:34:32.473993Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:34:32.473993Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Spectral and Energy Efficiency of Superimposed Pilots in Uplink Massive MIMO","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"eess.SP","authors_text":"Daniel Verenzuela, Emil Bj\\\"ornson, Luca Sanguinetti","submitted_at":"2017-09-22T12:53:18Z","abstract_excerpt":"Next generation wireless networks aim at providing substantial improvements in spectral efficiency (SE) and energy efficiency (EE). Massive MIMO has been proved to be a viable technology to achieve these goals by spatially multiplexing several users using many base station (BS) antennas. A potential limitation of Massive MIMO in multicell systems is pilot contamination, which arises in the channel estimation process from the interference caused by reusing pilots in neighboring cells. A standard method to reduce pilot contamination, known as regular pilot (RP), is to adjust the length of pilot "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1709.07722","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"},"aliases":[{"alias_kind":"arxiv","alias_value":"1709.07722","created_at":"2026-05-18T00:34:32.474050+00:00"},{"alias_kind":"arxiv_version","alias_value":"1709.07722v1","created_at":"2026-05-18T00:34:32.474050+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1709.07722","created_at":"2026-05-18T00:34:32.474050+00:00"},{"alias_kind":"pith_short_12","alias_value":"WSPCUJLY43AK","created_at":"2026-05-18T12:31:53.515858+00:00"},{"alias_kind":"pith_short_16","alias_value":"WSPCUJLY43AK54L5","created_at":"2026-05-18T12:31:53.515858+00:00"},{"alias_kind":"pith_short_8","alias_value":"WSPCUJLY","created_at":"2026-05-18T12:31:53.515858+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":0,"internal_anchor_count":0,"sample":[]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/WSPCUJLY43AK54L5X5SRMJRUQJ","json":"https://pith.science/pith/WSPCUJLY43AK54L5X5SRMJRUQJ.json","graph_json":"https://pith.science/api/pith-number/WSPCUJLY43AK54L5X5SRMJRUQJ/graph.json","events_json":"https://pith.science/api/pith-number/WSPCUJLY43AK54L5X5SRMJRUQJ/events.json","paper":"https://pith.science/paper/WSPCUJLY"},"agent_actions":{"view_html":"https://pith.science/pith/WSPCUJLY43AK54L5X5SRMJRUQJ","download_json":"https://pith.science/pith/WSPCUJLY43AK54L5X5SRMJRUQJ.json","view_paper":"https://pith.science/paper/WSPCUJLY","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=1709.07722&json=true","fetch_graph":"https://pith.science/api/pith-number/WSPCUJLY43AK54L5X5SRMJRUQJ/graph.json","fetch_events":"https://pith.science/api/pith-number/WSPCUJLY43AK54L5X5SRMJRUQJ/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/WSPCUJLY43AK54L5X5SRMJRUQJ/action/timestamp_anchor","attest_storage":"https://pith.science/pith/WSPCUJLY43AK54L5X5SRMJRUQJ/action/storage_attestation","attest_author":"https://pith.science/pith/WSPCUJLY43AK54L5X5SRMJRUQJ/action/author_attestation","sign_citation":"https://pith.science/pith/WSPCUJLY43AK54L5X5SRMJRUQJ/action/citation_signature","submit_replication":"https://pith.science/pith/WSPCUJLY43AK54L5X5SRMJRUQJ/action/replication_record"}},"created_at":"2026-05-18T00:34:32.474050+00:00","updated_at":"2026-05-18T00:34:32.474050+00:00"}