{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:IE3W2BSXRXP5GRLENH2PBINSHC","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":"65ca0c9c7f5441cf0a1a92a299b4ac85a0566075e3aaf01d50063e4d42397aac","cross_cats_sorted":["math.IT"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2018-01-21T06:42:23Z","title_canon_sha256":"3a270a3197fcdc330078ba0a2a1202f70d7626914a0a8a3f97c9e152f893328c"},"schema_version":"1.0","source":{"id":"1801.06776","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1801.06776","created_at":"2026-05-18T00:14:34Z"},{"alias_kind":"arxiv_version","alias_value":"1801.06776v2","created_at":"2026-05-18T00:14:34Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1801.06776","created_at":"2026-05-18T00:14:34Z"},{"alias_kind":"pith_short_12","alias_value":"IE3W2BSXRXP5","created_at":"2026-05-18T12:32:28Z"},{"alias_kind":"pith_short_16","alias_value":"IE3W2BSXRXP5GRLE","created_at":"2026-05-18T12:32:28Z"},{"alias_kind":"pith_short_8","alias_value":"IE3W2BSX","created_at":"2026-05-18T12:32:28Z"}],"graph_snapshots":[{"event_id":"sha256:b693b3ca4703eb463c2bee16dde345aebb51efcbe1816c813d2beeb7b2172e7b","target":"graph","created_at":"2026-05-18T00:14:34Z","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":"Medium-scale or large-scale receive antenna array with digital beamforming can be employed at receiver to make a significant interference reduction, but leads to expensive cost and high complexity of the RF-chain circuit. To deal with this issue, a classic analog-and-digital beamforming (ADB) structure was proposed in the literature for greatly reducing the number of RF-chains. Based on the ADB structure, we in this paper propose a robust hybrid ADB scheme to resist directions of arrival (DOAs) estimation errors. The key idea of our scheme is to employ null space projection (NSP) in analog bea","authors_text":"Feng Shu, Jiangzhou Wang, Jinhui Lu, Jun Li, Linlin Sun, Riqing Chen, Shuping Yang, Yaolu Qin, Yijin Zhang","cross_cats":["math.IT"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2018-01-21T06:42:23Z","title":"A Robust Secure Hybrid Analog and Digital Receive Beamforming Scheme for Efficient Interference Reduction"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1801.06776","kind":"arxiv","version":2},"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":"sha256:6ce03db043a7f2fdd3615046a7879ab710094bdfc82bb0fc6afe86b46b7d6f1e","target":"record","created_at":"2026-05-18T00:14:34Z","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":"65ca0c9c7f5441cf0a1a92a299b4ac85a0566075e3aaf01d50063e4d42397aac","cross_cats_sorted":["math.IT"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2018-01-21T06:42:23Z","title_canon_sha256":"3a270a3197fcdc330078ba0a2a1202f70d7626914a0a8a3f97c9e152f893328c"},"schema_version":"1.0","source":{"id":"1801.06776","kind":"arxiv","version":2}},"canonical_sha256":"41376d06578ddfd3456469f4f0a1b238bf2169eda1d7f70d62ee63012b5d2426","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"41376d06578ddfd3456469f4f0a1b238bf2169eda1d7f70d62ee63012b5d2426","first_computed_at":"2026-05-18T00:14:34.096794Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:14:34.096794Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"Xa4w0tVRfA4PJZ/3XLPOv12Lh50YF44qXYNIE5KAOfrqV/TNtTpMkGroo1AT29/Q0LhtRal2/RcGvOPf41afDA==","signature_status":"signed_v1","signed_at":"2026-05-18T00:14:34.097501Z","signed_message":"canonical_sha256_bytes"},"source_id":"1801.06776","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:6ce03db043a7f2fdd3615046a7879ab710094bdfc82bb0fc6afe86b46b7d6f1e","sha256:b693b3ca4703eb463c2bee16dde345aebb51efcbe1816c813d2beeb7b2172e7b"],"state_sha256":"5059856e7d280bb786995d049c842f8fef20c1cf0e18a048b69e45d83d8e6da9"}