{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2019:KTCS37KA5GMHV7PFYGPFFKFEKT","short_pith_number":"pith:KTCS37KA","canonical_record":{"source":{"id":"1901.11220","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SP","submitted_at":"2019-01-31T05:56:27Z","cross_cats_sorted":[],"title_canon_sha256":"cf59baed46114a4f378eaa7617e3131484045b4e00103ed1bd9dbb8f3627dfb7","abstract_canon_sha256":"230f6b70b22bee1f5de9211c796d67485b2b4456a658fd093d3581cd7bcb182a"},"schema_version":"1.0"},"canonical_sha256":"54c52dfd40e9987afde5c19e52a8a454e64ca107a0a4455623675780d7eb62a6","source":{"kind":"arxiv","id":"1901.11220","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1901.11220","created_at":"2026-05-17T23:39:24Z"},{"alias_kind":"arxiv_version","alias_value":"1901.11220v1","created_at":"2026-05-17T23:39:24Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1901.11220","created_at":"2026-05-17T23:39:24Z"},{"alias_kind":"pith_short_12","alias_value":"KTCS37KA5GMH","created_at":"2026-05-18T12:33:21Z"},{"alias_kind":"pith_short_16","alias_value":"KTCS37KA5GMHV7PF","created_at":"2026-05-18T12:33:21Z"},{"alias_kind":"pith_short_8","alias_value":"KTCS37KA","created_at":"2026-05-18T12:33:21Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2019:KTCS37KA5GMHV7PFYGPFFKFEKT","target":"record","payload":{"canonical_record":{"source":{"id":"1901.11220","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SP","submitted_at":"2019-01-31T05:56:27Z","cross_cats_sorted":[],"title_canon_sha256":"cf59baed46114a4f378eaa7617e3131484045b4e00103ed1bd9dbb8f3627dfb7","abstract_canon_sha256":"230f6b70b22bee1f5de9211c796d67485b2b4456a658fd093d3581cd7bcb182a"},"schema_version":"1.0"},"canonical_sha256":"54c52dfd40e9987afde5c19e52a8a454e64ca107a0a4455623675780d7eb62a6","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-17T23:39:24.975028Z","signature_b64":"r6vzd6NLYvqm481xT4ZyuoK47+JZKRwOaK+MwvJBhmI5x2BZOUYgkB2fBbIBXhUq1zVq2Rdde0Yx2KWRLm9uBQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"54c52dfd40e9987afde5c19e52a8a454e64ca107a0a4455623675780d7eb62a6","last_reissued_at":"2026-05-17T23:39:24.974128Z","signature_status":"signed_v1","first_computed_at":"2026-05-17T23:39:24.974128Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1901.11220","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":"2026-05-17T23:39:24Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"mKk91ngSfaU34rt1+ZNlRQCZzfKr62sqcUc83KcjUtAqYxTKIi7kae7X2qlvh54TG3yA5yZPkFRy6lm2a4L5Dg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-01T22:18:15.133176Z"},"content_sha256":"315328905aa287bbdcd3a0ad897c13afd5bf4fd5ccbe29c1cd26b71a5ad25dc2","schema_version":"1.0","event_id":"sha256:315328905aa287bbdcd3a0ad897c13afd5bf4fd5ccbe29c1cd26b71a5ad25dc2"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2019:KTCS37KA5GMHV7PFYGPFFKFEKT","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Compressive Initial Access and Beamforming Training for Millimeter-Wave Cellular Systems","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"eess.SP","authors_text":"Danijela Cabric, Han Yan","submitted_at":"2019-01-31T05:56:27Z","abstract_excerpt":"Initial access (IA) is a fundamental physical layer procedure in cellular systems where user equipment (UE) detects nearby base station (BS) as well as acquire synchronization. Due to the necessity of using antenna array in millimeter-wave (mmW) IA, the channel spatial information can also be inferred. The state-of-the-art directional IA (DIA) uses sector sounding beams with limited angular resolution, and thus requires additional dedicated radio resources, access latency and overhead for refined beam training. To remedy the problem of access latency and overhead in DIA, this work proposes to "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1901.11220","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"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-17T23:39:24Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Xt/BGihFA2rsCrqtEz4ijUqCwKqdD9lSsjm3hjB8HwO1k+/mksabgZsU+gve44aNkKzIUxmdewtUoQS5hMtPAQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-01T22:18:15.133548Z"},"content_sha256":"d44feffc93c44d83a76b55be3a42a2b9ae2daf2093bb4f4a14ec380d59b70361","schema_version":"1.0","event_id":"sha256:d44feffc93c44d83a76b55be3a42a2b9ae2daf2093bb4f4a14ec380d59b70361"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/KTCS37KA5GMHV7PFYGPFFKFEKT/bundle.json","state_url":"https://pith.science/pith/KTCS37KA5GMHV7PFYGPFFKFEKT/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/KTCS37KA5GMHV7PFYGPFFKFEKT/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":"2026-06-01T22:18:15Z","links":{"resolver":"https://pith.science/pith/KTCS37KA5GMHV7PFYGPFFKFEKT","bundle":"https://pith.science/pith/KTCS37KA5GMHV7PFYGPFFKFEKT/bundle.json","state":"https://pith.science/pith/KTCS37KA5GMHV7PFYGPFFKFEKT/state.json","well_known_bundle":"https://pith.science/.well-known/pith/KTCS37KA5GMHV7PFYGPFFKFEKT/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2019:KTCS37KA5GMHV7PFYGPFFKFEKT","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":"230f6b70b22bee1f5de9211c796d67485b2b4456a658fd093d3581cd7bcb182a","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SP","submitted_at":"2019-01-31T05:56:27Z","title_canon_sha256":"cf59baed46114a4f378eaa7617e3131484045b4e00103ed1bd9dbb8f3627dfb7"},"schema_version":"1.0","source":{"id":"1901.11220","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1901.11220","created_at":"2026-05-17T23:39:24Z"},{"alias_kind":"arxiv_version","alias_value":"1901.11220v1","created_at":"2026-05-17T23:39:24Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1901.11220","created_at":"2026-05-17T23:39:24Z"},{"alias_kind":"pith_short_12","alias_value":"KTCS37KA5GMH","created_at":"2026-05-18T12:33:21Z"},{"alias_kind":"pith_short_16","alias_value":"KTCS37KA5GMHV7PF","created_at":"2026-05-18T12:33:21Z"},{"alias_kind":"pith_short_8","alias_value":"KTCS37KA","created_at":"2026-05-18T12:33:21Z"}],"graph_snapshots":[{"event_id":"sha256:d44feffc93c44d83a76b55be3a42a2b9ae2daf2093bb4f4a14ec380d59b70361","target":"graph","created_at":"2026-05-17T23:39:24Z","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":"Initial access (IA) is a fundamental physical layer procedure in cellular systems where user equipment (UE) detects nearby base station (BS) as well as acquire synchronization. Due to the necessity of using antenna array in millimeter-wave (mmW) IA, the channel spatial information can also be inferred. The state-of-the-art directional IA (DIA) uses sector sounding beams with limited angular resolution, and thus requires additional dedicated radio resources, access latency and overhead for refined beam training. To remedy the problem of access latency and overhead in DIA, this work proposes to ","authors_text":"Danijela Cabric, Han Yan","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SP","submitted_at":"2019-01-31T05:56:27Z","title":"Compressive Initial Access and Beamforming Training for Millimeter-Wave Cellular Systems"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1901.11220","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":"sha256:315328905aa287bbdcd3a0ad897c13afd5bf4fd5ccbe29c1cd26b71a5ad25dc2","target":"record","created_at":"2026-05-17T23:39:24Z","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":"230f6b70b22bee1f5de9211c796d67485b2b4456a658fd093d3581cd7bcb182a","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SP","submitted_at":"2019-01-31T05:56:27Z","title_canon_sha256":"cf59baed46114a4f378eaa7617e3131484045b4e00103ed1bd9dbb8f3627dfb7"},"schema_version":"1.0","source":{"id":"1901.11220","kind":"arxiv","version":1}},"canonical_sha256":"54c52dfd40e9987afde5c19e52a8a454e64ca107a0a4455623675780d7eb62a6","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"54c52dfd40e9987afde5c19e52a8a454e64ca107a0a4455623675780d7eb62a6","first_computed_at":"2026-05-17T23:39:24.974128Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-17T23:39:24.974128Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"r6vzd6NLYvqm481xT4ZyuoK47+JZKRwOaK+MwvJBhmI5x2BZOUYgkB2fBbIBXhUq1zVq2Rdde0Yx2KWRLm9uBQ==","signature_status":"signed_v1","signed_at":"2026-05-17T23:39:24.975028Z","signed_message":"canonical_sha256_bytes"},"source_id":"1901.11220","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:315328905aa287bbdcd3a0ad897c13afd5bf4fd5ccbe29c1cd26b71a5ad25dc2","sha256:d44feffc93c44d83a76b55be3a42a2b9ae2daf2093bb4f4a14ec380d59b70361"],"state_sha256":"b2fc3b8044ef91be31df0d4102391e0d7972fc7ca4b10f51b1ba1ab21a425abc"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"fda68fcIizkYlYULLGkkSSJaQWMU3JZL/ca/4VO3RiQqL1MVmKhtNs0zMWxSOwQAs1Bg7JDaIvPW+58/bk2CBA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-01T22:18:15.135569Z","bundle_sha256":"4d8f7462ab38cb48fe3d96692be729d9fdaa67138b9e9c4177d2e6e7eb310a3b"}}