{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:5SC3H7OC6S2U22XG5C67KDLGKD","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":"51746340af15c2a805232cb6a08dc28f6e6974edd01d8e40af27a493b5373912","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SP","submitted_at":"2018-03-21T03:26:56Z","title_canon_sha256":"34d4d694add626d9fe024440a755061775356df58e897ece598fbfe5873d08df"},"schema_version":"1.0","source":{"id":"1803.07731","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1803.07731","created_at":"2026-05-18T00:20:29Z"},{"alias_kind":"arxiv_version","alias_value":"1803.07731v1","created_at":"2026-05-18T00:20:29Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1803.07731","created_at":"2026-05-18T00:20:29Z"},{"alias_kind":"pith_short_12","alias_value":"5SC3H7OC6S2U","created_at":"2026-05-18T12:32:08Z"},{"alias_kind":"pith_short_16","alias_value":"5SC3H7OC6S2U22XG","created_at":"2026-05-18T12:32:08Z"},{"alias_kind":"pith_short_8","alias_value":"5SC3H7OC","created_at":"2026-05-18T12:32:08Z"}],"graph_snapshots":[{"event_id":"sha256:30f4fb2e878bb094385859d71a09a39ace9e911eac00cdf402b8f747feb976e9","target":"graph","created_at":"2026-05-18T00:20:29Z","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":"Considering the expensive radio frequency (RF) chain, huge training overhead and feedback burden issues in massive MIMO, in this letter, we propose a mixed-timescale per-group hybrid precoding (MPHP) scheme under an adaptive partially-connected RF precoding structure (PRPS), where the RF precoder is implemented using an adaptive connection network (ACN) and M analog phase shifters (APSs), where M is the number of antennas at the base station (BS). Exploiting the mixed-time stage channel state information (CSI) structure, the joint-design of ACN and APSs is formulated as a statistical signal-to","authors_text":"An Liu, Min Wei, Vincent Lau, Yinglei Teng, Yong Zhang","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SP","submitted_at":"2018-03-21T03:26:56Z","title":"Mixed-timescale Per-group Hybrid Precoding for Multiuser Massive MIMO Systems"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1803.07731","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":"sha256:73c76fde5ebd4667f3b7c134d549c0a2fc9fba200852a884003f2e4f5f0e0d63","target":"record","created_at":"2026-05-18T00:20:29Z","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":"51746340af15c2a805232cb6a08dc28f6e6974edd01d8e40af27a493b5373912","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SP","submitted_at":"2018-03-21T03:26:56Z","title_canon_sha256":"34d4d694add626d9fe024440a755061775356df58e897ece598fbfe5873d08df"},"schema_version":"1.0","source":{"id":"1803.07731","kind":"arxiv","version":1}},"canonical_sha256":"ec85b3fdc2f4b54d6ae6e8bdf50d6650d9d25a42c36d6243d90405633babee8c","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"ec85b3fdc2f4b54d6ae6e8bdf50d6650d9d25a42c36d6243d90405633babee8c","first_computed_at":"2026-05-18T00:20:29.135661Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:20:29.135661Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"ATMDxyFDXPKGcIqbHglhQsk2MtEW3Y5EV15dwNJoZ3J6G3RLAOry/HpwTX2Qe3dZy48AHk1SCslpLxNlVzM3AQ==","signature_status":"signed_v1","signed_at":"2026-05-18T00:20:29.136161Z","signed_message":"canonical_sha256_bytes"},"source_id":"1803.07731","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:73c76fde5ebd4667f3b7c134d549c0a2fc9fba200852a884003f2e4f5f0e0d63","sha256:30f4fb2e878bb094385859d71a09a39ace9e911eac00cdf402b8f747feb976e9"],"state_sha256":"f968756c9b9a44604da1caefd104342b56a583ba3c3a2a426a05c73fa409df4f"}