{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2022:NVRBNRIGYBCRD4H6A5VZX5JWLP","short_pith_number":"pith:NVRBNRIG","canonical_record":{"source":{"id":"2209.06669","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SY","submitted_at":"2022-09-14T14:25:56Z","cross_cats_sorted":["cs.LG","cs.SY"],"title_canon_sha256":"10a251ac6e4ed8d9a7fccacfa7152b3f3240c83f30d07b85cf7e421ff06c9b10","abstract_canon_sha256":"adc6ee37fb2f60eef2a14f2a077bcef197a5872010da9444c7861ad60c9eeec3"},"schema_version":"1.0"},"canonical_sha256":"6d6216c506c04511f0fe076b9bf5365be598d2112a9beaaa96686c38732fee2a","source":{"kind":"arxiv","id":"2209.06669","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2209.06669","created_at":"2026-07-05T04:57:33Z"},{"alias_kind":"arxiv_version","alias_value":"2209.06669v1","created_at":"2026-07-05T04:57:33Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2209.06669","created_at":"2026-07-05T04:57:33Z"},{"alias_kind":"pith_short_12","alias_value":"NVRBNRIGYBCR","created_at":"2026-07-05T04:57:33Z"},{"alias_kind":"pith_short_16","alias_value":"NVRBNRIGYBCRD4H6","created_at":"2026-07-05T04:57:33Z"},{"alias_kind":"pith_short_8","alias_value":"NVRBNRIG","created_at":"2026-07-05T04:57:33Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2022:NVRBNRIGYBCRD4H6A5VZX5JWLP","target":"record","payload":{"canonical_record":{"source":{"id":"2209.06669","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SY","submitted_at":"2022-09-14T14:25:56Z","cross_cats_sorted":["cs.LG","cs.SY"],"title_canon_sha256":"10a251ac6e4ed8d9a7fccacfa7152b3f3240c83f30d07b85cf7e421ff06c9b10","abstract_canon_sha256":"adc6ee37fb2f60eef2a14f2a077bcef197a5872010da9444c7861ad60c9eeec3"},"schema_version":"1.0"},"canonical_sha256":"6d6216c506c04511f0fe076b9bf5365be598d2112a9beaaa96686c38732fee2a","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T04:57:33.621415Z","signature_b64":"CGbizOKYiX1dsYfx9m5wCF8e/9de9e+xbIv2/kSsMqy3TfEZ9JGyDkWfEopNZp5Wisz97aKwf3dEmeNPa14JBg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"6d6216c506c04511f0fe076b9bf5365be598d2112a9beaaa96686c38732fee2a","last_reissued_at":"2026-07-05T04:57:33.620970Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T04:57:33.620970Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2209.06669","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":"2026-07-05T04:57:33Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"qqoaFxwDh6XoB4kpmT3Uy3j6BoZYlDZmpuFCez4QXGIrlBaJO6G2C299ftIuaBNHqrEWrTYy/IlZdOuYeCNXCg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-06T18:44:23.704823Z"},"content_sha256":"6b748655e96f769cd3311d7c6258ceb1b651f600b103e6f8660238d6ad8958be","schema_version":"1.0","event_id":"sha256:6b748655e96f769cd3311d7c6258ceb1b651f600b103e6f8660238d6ad8958be"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2022:NVRBNRIGYBCRD4H6A5VZX5JWLP","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Efficient Beam Search for Initial Access Using Collaborative Filtering","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["cs.LG","cs.SY"],"primary_cat":"eess.SY","authors_text":"Axel Plinge, Christopher Mutschler, George Yammine, Georgios Kontes, Norbert Franke","submitted_at":"2022-09-14T14:25:56Z","abstract_excerpt":"Beamforming-capable antenna arrays overcome the high free-space path loss at higher carrier frequencies. However, the beams must be properly aligned to ensure that the highest power is radiated towards (and received by) the user equipment (UE). While there are methods that improve upon an exhaustive search for optimal beams by some form of hierarchical search, they can be prone to return only locally optimal solutions with small beam gains. Other approaches address this problem by exploiting contextual information, e.g., the position of the UE or information from neighboring base stations (BS)"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2209.06669","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2209.06669/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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":"2026-07-05T04:57:33Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"AIrI18XQ6n84WGKUz69/KAeIfx6UJDEMCThtcI/v8SacI/uQqAjaflLC2Inj5oRtt9TKFHBY+SrhI4L1r5zzBw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-06T18:44:23.705191Z"},"content_sha256":"e3a92d1c5fc78fe71e7e97e286445bbead9b142a0ab85ac28f192b5a8b98c638","schema_version":"1.0","event_id":"sha256:e3a92d1c5fc78fe71e7e97e286445bbead9b142a0ab85ac28f192b5a8b98c638"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/NVRBNRIGYBCRD4H6A5VZX5JWLP/bundle.json","state_url":"https://pith.science/pith/NVRBNRIGYBCRD4H6A5VZX5JWLP/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/NVRBNRIGYBCRD4H6A5VZX5JWLP/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":"2026-07-06T18:44:23Z","links":{"resolver":"https://pith.science/pith/NVRBNRIGYBCRD4H6A5VZX5JWLP","bundle":"https://pith.science/pith/NVRBNRIGYBCRD4H6A5VZX5JWLP/bundle.json","state":"https://pith.science/pith/NVRBNRIGYBCRD4H6A5VZX5JWLP/state.json","well_known_bundle":"https://pith.science/.well-known/pith/NVRBNRIGYBCRD4H6A5VZX5JWLP/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2022:NVRBNRIGYBCRD4H6A5VZX5JWLP","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":"adc6ee37fb2f60eef2a14f2a077bcef197a5872010da9444c7861ad60c9eeec3","cross_cats_sorted":["cs.LG","cs.SY"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SY","submitted_at":"2022-09-14T14:25:56Z","title_canon_sha256":"10a251ac6e4ed8d9a7fccacfa7152b3f3240c83f30d07b85cf7e421ff06c9b10"},"schema_version":"1.0","source":{"id":"2209.06669","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2209.06669","created_at":"2026-07-05T04:57:33Z"},{"alias_kind":"arxiv_version","alias_value":"2209.06669v1","created_at":"2026-07-05T04:57:33Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2209.06669","created_at":"2026-07-05T04:57:33Z"},{"alias_kind":"pith_short_12","alias_value":"NVRBNRIGYBCR","created_at":"2026-07-05T04:57:33Z"},{"alias_kind":"pith_short_16","alias_value":"NVRBNRIGYBCRD4H6","created_at":"2026-07-05T04:57:33Z"},{"alias_kind":"pith_short_8","alias_value":"NVRBNRIG","created_at":"2026-07-05T04:57:33Z"}],"graph_snapshots":[{"event_id":"sha256:e3a92d1c5fc78fe71e7e97e286445bbead9b142a0ab85ac28f192b5a8b98c638","target":"graph","created_at":"2026-07-05T04:57:33Z","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"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/2209.06669/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Beamforming-capable antenna arrays overcome the high free-space path loss at higher carrier frequencies. However, the beams must be properly aligned to ensure that the highest power is radiated towards (and received by) the user equipment (UE). While there are methods that improve upon an exhaustive search for optimal beams by some form of hierarchical search, they can be prone to return only locally optimal solutions with small beam gains. Other approaches address this problem by exploiting contextual information, e.g., the position of the UE or information from neighboring base stations (BS)","authors_text":"Axel Plinge, Christopher Mutschler, George Yammine, Georgios Kontes, Norbert Franke","cross_cats":["cs.LG","cs.SY"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SY","submitted_at":"2022-09-14T14:25:56Z","title":"Efficient Beam Search for Initial Access Using Collaborative Filtering"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2209.06669","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":"sha256:6b748655e96f769cd3311d7c6258ceb1b651f600b103e6f8660238d6ad8958be","target":"record","created_at":"2026-07-05T04:57:33Z","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":"adc6ee37fb2f60eef2a14f2a077bcef197a5872010da9444c7861ad60c9eeec3","cross_cats_sorted":["cs.LG","cs.SY"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SY","submitted_at":"2022-09-14T14:25:56Z","title_canon_sha256":"10a251ac6e4ed8d9a7fccacfa7152b3f3240c83f30d07b85cf7e421ff06c9b10"},"schema_version":"1.0","source":{"id":"2209.06669","kind":"arxiv","version":1}},"canonical_sha256":"6d6216c506c04511f0fe076b9bf5365be598d2112a9beaaa96686c38732fee2a","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"6d6216c506c04511f0fe076b9bf5365be598d2112a9beaaa96686c38732fee2a","first_computed_at":"2026-07-05T04:57:33.620970Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T04:57:33.620970Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"CGbizOKYiX1dsYfx9m5wCF8e/9de9e+xbIv2/kSsMqy3TfEZ9JGyDkWfEopNZp5Wisz97aKwf3dEmeNPa14JBg==","signature_status":"signed_v1","signed_at":"2026-07-05T04:57:33.621415Z","signed_message":"canonical_sha256_bytes"},"source_id":"2209.06669","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:6b748655e96f769cd3311d7c6258ceb1b651f600b103e6f8660238d6ad8958be","sha256:e3a92d1c5fc78fe71e7e97e286445bbead9b142a0ab85ac28f192b5a8b98c638"],"state_sha256":"d33516606cae137e96efb2fc8b2494f62aef9abb82696e699f4ae8a0f8eb8d7e"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"nQIrHEpdmneDbT91L8tPzTC1eu3q1ya4WOvXSFR2Uegt+RxMgNCBETnsCa7uvTYO5Sw5RofIAHGlhP0OaLvHBw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-07-06T18:44:23.708924Z","bundle_sha256":"106c3749d9fd00081f8f9a7b6f84f1de3ab20afb8f9a0cd02ca93ebcb082234e"}}