{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2015:R5GKA4AMQVPWZVLUMEHV4HCJ3W","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":"6f2c81152cb0f5024044b9f82be3244610002090bddd46a001cc480ad768c2ea","cross_cats_sorted":["math.IT"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2015-07-15T13:40:22Z","title_canon_sha256":"f1e96055427548722010e27ba9737567bf03b20251e8d67b1e57488844515a6d"},"schema_version":"1.0","source":{"id":"1507.04213","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1507.04213","created_at":"2026-05-18T01:36:48Z"},{"alias_kind":"arxiv_version","alias_value":"1507.04213v1","created_at":"2026-05-18T01:36:48Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1507.04213","created_at":"2026-05-18T01:36:48Z"},{"alias_kind":"pith_short_12","alias_value":"R5GKA4AMQVPW","created_at":"2026-05-18T12:29:39Z"},{"alias_kind":"pith_short_16","alias_value":"R5GKA4AMQVPWZVLU","created_at":"2026-05-18T12:29:39Z"},{"alias_kind":"pith_short_8","alias_value":"R5GKA4AM","created_at":"2026-05-18T12:29:39Z"}],"graph_snapshots":[{"event_id":"sha256:aa52ec5b64f2225fd4922ee3f7a7e066dfc657c620c515bb726dbb471caf2b25","target":"graph","created_at":"2026-05-18T01:36:48Z","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":"The users at cell edge of a massive multiple-input multiple-output (MIMO) system suffer from severe pilot contamination, which leads to poor quality of service (QoS). In order to enhance the QoS for these edge users, soft pilot reuse (SPR) combined with multi-cell block diagonalization (MBD) precoding are proposed. Specifically, the users are divided into two groups according to their large-scale fading coefficients, referred to as the center users, who only suffer from modest pilot contamination and the edge users, who suffer from severe pilot contamination. Based on this distinction, the SPR","authors_text":"Chen Qian, Jinhui Chen, Lajos Hanzo, Linglong Dai, Sheng Chen, Xudong Zhu, Zhaocheng Wang","cross_cats":["math.IT"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2015-07-15T13:40:22Z","title":"Soft Pilot Reuse and Multi-Cell Block Diagonalization Precoding for Massive MIMO Systems"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1507.04213","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:ff5960ac3425cef9a4da91f8cd292a27c3860ad46021947654a99807dce0b672","target":"record","created_at":"2026-05-18T01:36:48Z","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":"6f2c81152cb0f5024044b9f82be3244610002090bddd46a001cc480ad768c2ea","cross_cats_sorted":["math.IT"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2015-07-15T13:40:22Z","title_canon_sha256":"f1e96055427548722010e27ba9737567bf03b20251e8d67b1e57488844515a6d"},"schema_version":"1.0","source":{"id":"1507.04213","kind":"arxiv","version":1}},"canonical_sha256":"8f4ca0700c855f6cd574610f5e1c49ddb92caef9f90b590b38feefcf6783d0a1","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"8f4ca0700c855f6cd574610f5e1c49ddb92caef9f90b590b38feefcf6783d0a1","first_computed_at":"2026-05-18T01:36:48.856953Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:36:48.856953Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"iHd3OFW6efGZZUzwCzx22XgvCg6LjeWS21Ejr7PMWDfSWwp4rGJUZ6jLXPfqiYy1gNLHaVfa0yBas3qwftYLCQ==","signature_status":"signed_v1","signed_at":"2026-05-18T01:36:48.857552Z","signed_message":"canonical_sha256_bytes"},"source_id":"1507.04213","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:ff5960ac3425cef9a4da91f8cd292a27c3860ad46021947654a99807dce0b672","sha256:aa52ec5b64f2225fd4922ee3f7a7e066dfc657c620c515bb726dbb471caf2b25"],"state_sha256":"cde7054100e456310a8fdbc9725cd98bdc1a7f4330f6c34b84a23ef0845f235c"}