{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2017:QAYOQPONC2HBCRVKWXJIXU3VZY","short_pith_number":"pith:QAYOQPON","canonical_record":{"source":{"id":"1712.02085","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2017-12-06T08:50:37Z","cross_cats_sorted":["math.IT"],"title_canon_sha256":"12d6d9413095e86111a3930635da6250a89f005f0802d7cfcd39b324b7fb753d","abstract_canon_sha256":"ba81c6b1aca86fe3dea3c65b06329f548998a5a6e87dab565b8657182246acac"},"schema_version":"1.0"},"canonical_sha256":"8030e83dcd168e1146aab5d28bd375ce0556554bd405bf9f453cf2912ff44965","source":{"kind":"arxiv","id":"1712.02085","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1712.02085","created_at":"2026-05-18T00:28:39Z"},{"alias_kind":"arxiv_version","alias_value":"1712.02085v1","created_at":"2026-05-18T00:28:39Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1712.02085","created_at":"2026-05-18T00:28:39Z"},{"alias_kind":"pith_short_12","alias_value":"QAYOQPONC2HB","created_at":"2026-05-18T12:31:37Z"},{"alias_kind":"pith_short_16","alias_value":"QAYOQPONC2HBCRVK","created_at":"2026-05-18T12:31:37Z"},{"alias_kind":"pith_short_8","alias_value":"QAYOQPON","created_at":"2026-05-18T12:31:37Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2017:QAYOQPONC2HBCRVKWXJIXU3VZY","target":"record","payload":{"canonical_record":{"source":{"id":"1712.02085","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2017-12-06T08:50:37Z","cross_cats_sorted":["math.IT"],"title_canon_sha256":"12d6d9413095e86111a3930635da6250a89f005f0802d7cfcd39b324b7fb753d","abstract_canon_sha256":"ba81c6b1aca86fe3dea3c65b06329f548998a5a6e87dab565b8657182246acac"},"schema_version":"1.0"},"canonical_sha256":"8030e83dcd168e1146aab5d28bd375ce0556554bd405bf9f453cf2912ff44965","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:28:39.231210Z","signature_b64":"qwxaULS9C87dGL1aejnGKdxyuuz08QnChh6wQV4Zd+/XViRo9cP96tRrcIZImMNvZPXqkfStmYixlFaB0dBmAA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"8030e83dcd168e1146aab5d28bd375ce0556554bd405bf9f453cf2912ff44965","last_reissued_at":"2026-05-18T00:28:39.230567Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:28:39.230567Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1712.02085","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":"2026-05-18T00:28:39Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"jIk8quDIuZs7G5uNaE0pnX33hAgwO2ZamfapJrRX9d+d8860H/f/NtgUdvZkJoy/dAdNyRMe+H9qlZh41O/kDA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-11T02:26:57.278775Z"},"content_sha256":"ed0c00be27b1e07620355fa7521efa1a4cfafcb7e4cf1b03f5375dee30e71663","schema_version":"1.0","event_id":"sha256:ed0c00be27b1e07620355fa7521efa1a4cfafcb7e4cf1b03f5375dee30e71663"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2017:QAYOQPONC2HBCRVKWXJIXU3VZY","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Low-Complexity and High-Resolution DOA Estimation for Hybrid Analog and Digital Massive MIMO Receive Array","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["math.IT"],"primary_cat":"cs.IT","authors_text":"Feng Shu, Jun Li, Linqing Gui, Tingting Liu, Yaolu Qin, Yijin Zhang, Zhu Han","submitted_at":"2017-12-06T08:50:37Z","abstract_excerpt":"A large-scale fully-digital receive antenna array can provide very high-resolution direction of arrival (DOA) estimation, but resulting in a significantly high RF-chain circuit cost. Thus, a hybrid analog and digital (HAD) structure is preferred. Two phase alignment (PA) methods, HAD PA (HADPA) and hybrid digital and analog PA (HDAPA), are proposed to estimate DOA based on the parametric method. Compared to analog phase alignment (APA), they can significantly reduce the complexity in the PA phases. Subsequently, a fast root multiple signal classification HDAPA (Root-MUSIC-HDAPA) method is prop"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1712.02085","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":"2026-05-18T00:28:39Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"NyuQw6rWx36WhO6BNbZvZb6WniggNNUcqt0Ct+hTk4WabKf245Kr8yBaAZLtmki5/RSap9bwPLqkkZcPerHRAA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-11T02:26:57.279501Z"},"content_sha256":"5971c4c5108a2a791576432a1fc17ff6f817c0b8e0453b678856ae6ea920e81d","schema_version":"1.0","event_id":"sha256:5971c4c5108a2a791576432a1fc17ff6f817c0b8e0453b678856ae6ea920e81d"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/QAYOQPONC2HBCRVKWXJIXU3VZY/bundle.json","state_url":"https://pith.science/pith/QAYOQPONC2HBCRVKWXJIXU3VZY/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/QAYOQPONC2HBCRVKWXJIXU3VZY/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":"2026-06-11T02:26:57Z","links":{"resolver":"https://pith.science/pith/QAYOQPONC2HBCRVKWXJIXU3VZY","bundle":"https://pith.science/pith/QAYOQPONC2HBCRVKWXJIXU3VZY/bundle.json","state":"https://pith.science/pith/QAYOQPONC2HBCRVKWXJIXU3VZY/state.json","well_known_bundle":"https://pith.science/.well-known/pith/QAYOQPONC2HBCRVKWXJIXU3VZY/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2017:QAYOQPONC2HBCRVKWXJIXU3VZY","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":"ba81c6b1aca86fe3dea3c65b06329f548998a5a6e87dab565b8657182246acac","cross_cats_sorted":["math.IT"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2017-12-06T08:50:37Z","title_canon_sha256":"12d6d9413095e86111a3930635da6250a89f005f0802d7cfcd39b324b7fb753d"},"schema_version":"1.0","source":{"id":"1712.02085","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1712.02085","created_at":"2026-05-18T00:28:39Z"},{"alias_kind":"arxiv_version","alias_value":"1712.02085v1","created_at":"2026-05-18T00:28:39Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1712.02085","created_at":"2026-05-18T00:28:39Z"},{"alias_kind":"pith_short_12","alias_value":"QAYOQPONC2HB","created_at":"2026-05-18T12:31:37Z"},{"alias_kind":"pith_short_16","alias_value":"QAYOQPONC2HBCRVK","created_at":"2026-05-18T12:31:37Z"},{"alias_kind":"pith_short_8","alias_value":"QAYOQPON","created_at":"2026-05-18T12:31:37Z"}],"graph_snapshots":[{"event_id":"sha256:5971c4c5108a2a791576432a1fc17ff6f817c0b8e0453b678856ae6ea920e81d","target":"graph","created_at":"2026-05-18T00:28:39Z","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":"A large-scale fully-digital receive antenna array can provide very high-resolution direction of arrival (DOA) estimation, but resulting in a significantly high RF-chain circuit cost. Thus, a hybrid analog and digital (HAD) structure is preferred. Two phase alignment (PA) methods, HAD PA (HADPA) and hybrid digital and analog PA (HDAPA), are proposed to estimate DOA based on the parametric method. Compared to analog phase alignment (APA), they can significantly reduce the complexity in the PA phases. Subsequently, a fast root multiple signal classification HDAPA (Root-MUSIC-HDAPA) method is prop","authors_text":"Feng Shu, Jun Li, Linqing Gui, Tingting Liu, Yaolu Qin, Yijin Zhang, Zhu Han","cross_cats":["math.IT"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2017-12-06T08:50:37Z","title":"Low-Complexity and High-Resolution DOA Estimation for Hybrid Analog and Digital Massive MIMO Receive Array"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1712.02085","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:ed0c00be27b1e07620355fa7521efa1a4cfafcb7e4cf1b03f5375dee30e71663","target":"record","created_at":"2026-05-18T00:28:39Z","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":"ba81c6b1aca86fe3dea3c65b06329f548998a5a6e87dab565b8657182246acac","cross_cats_sorted":["math.IT"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2017-12-06T08:50:37Z","title_canon_sha256":"12d6d9413095e86111a3930635da6250a89f005f0802d7cfcd39b324b7fb753d"},"schema_version":"1.0","source":{"id":"1712.02085","kind":"arxiv","version":1}},"canonical_sha256":"8030e83dcd168e1146aab5d28bd375ce0556554bd405bf9f453cf2912ff44965","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"8030e83dcd168e1146aab5d28bd375ce0556554bd405bf9f453cf2912ff44965","first_computed_at":"2026-05-18T00:28:39.230567Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:28:39.230567Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"qwxaULS9C87dGL1aejnGKdxyuuz08QnChh6wQV4Zd+/XViRo9cP96tRrcIZImMNvZPXqkfStmYixlFaB0dBmAA==","signature_status":"signed_v1","signed_at":"2026-05-18T00:28:39.231210Z","signed_message":"canonical_sha256_bytes"},"source_id":"1712.02085","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:ed0c00be27b1e07620355fa7521efa1a4cfafcb7e4cf1b03f5375dee30e71663","sha256:5971c4c5108a2a791576432a1fc17ff6f817c0b8e0453b678856ae6ea920e81d"],"state_sha256":"aba6cb73ba099d123110c9c97e8b92494041631ccd43a8481f8e69e3672d535d"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"7Qw3nSgCIRDrSvm/gvCf1V38+spQZqTq/Ta5TbPcOwAxQEgmIIgf+FJB9O0bUFLmUU//HZM05lpB78hKr/lLAw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-11T02:26:57.283323Z","bundle_sha256":"71b99ae44129ed365f4d038cdd7f9e9ad043c853b852f8c26fc23fadb52f0ebb"}}