{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2019:6VFJI2PNM7WRDMRVSJTGCZZBRT","short_pith_number":"pith:6VFJI2PN","canonical_record":{"source":{"id":"1901.05109","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SP","submitted_at":"2019-01-16T02:06:53Z","cross_cats_sorted":[],"title_canon_sha256":"654cdc09bc931bf6217d39a346b50eec6aa5a64c328e564189ed67b13b72c08b","abstract_canon_sha256":"f6731ceb6ab35d1dba10aa95af114398a7958ff6ecf60314e02ec810d36f4617"},"schema_version":"1.0"},"canonical_sha256":"f54a9469ed67ed11b23592666167218cd62c179f1d165153d1f7a088d1d5336c","source":{"kind":"arxiv","id":"1901.05109","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1901.05109","created_at":"2026-05-17T23:47:39Z"},{"alias_kind":"arxiv_version","alias_value":"1901.05109v1","created_at":"2026-05-17T23:47:39Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1901.05109","created_at":"2026-05-17T23:47:39Z"},{"alias_kind":"pith_short_12","alias_value":"6VFJI2PNM7WR","created_at":"2026-05-18T12:33:10Z"},{"alias_kind":"pith_short_16","alias_value":"6VFJI2PNM7WRDMRV","created_at":"2026-05-18T12:33:10Z"},{"alias_kind":"pith_short_8","alias_value":"6VFJI2PN","created_at":"2026-05-18T12:33:10Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2019:6VFJI2PNM7WRDMRVSJTGCZZBRT","target":"record","payload":{"canonical_record":{"source":{"id":"1901.05109","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SP","submitted_at":"2019-01-16T02:06:53Z","cross_cats_sorted":[],"title_canon_sha256":"654cdc09bc931bf6217d39a346b50eec6aa5a64c328e564189ed67b13b72c08b","abstract_canon_sha256":"f6731ceb6ab35d1dba10aa95af114398a7958ff6ecf60314e02ec810d36f4617"},"schema_version":"1.0"},"canonical_sha256":"f54a9469ed67ed11b23592666167218cd62c179f1d165153d1f7a088d1d5336c","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-17T23:47:39.491593Z","signature_b64":"LDOR6/2Z/9P9PwyDsJvGAD6LShCMw51sl6pbLf/gO7YL9/WStGFNLJAi+YSoLjnTcWZ5/XxgJ9KkolDVeLN3Bg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"f54a9469ed67ed11b23592666167218cd62c179f1d165153d1f7a088d1d5336c","last_reissued_at":"2026-05-17T23:47:39.491133Z","signature_status":"signed_v1","first_computed_at":"2026-05-17T23:47:39.491133Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1901.05109","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":"2026-05-17T23:47:39Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"rVodCj6sdMu91TxFmJBMxDUtqCMvBAkhaD4gl74Ii7Mt87yE0Rt/xHzO3mfXKf/+3wpzXdmELfOKEcEMkGF0BQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-04T08:39:12.404388Z"},"content_sha256":"4fb72c5676c9dd9fe00c25b7143ffd042d2bb59235a0f2d8a73de908b28d1014","schema_version":"1.0","event_id":"sha256:4fb72c5676c9dd9fe00c25b7143ffd042d2bb59235a0f2d8a73de908b28d1014"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2019:6VFJI2PNM7WRDMRVSJTGCZZBRT","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"One-Bit MUSIC","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"eess.SP","authors_text":"Bin Liao, Xiaodong Huang","submitted_at":"2019-01-16T02:06:53Z","abstract_excerpt":"In this letter, we consider the problem of direction-of-arrival (DOA) estimation with one-bit quantized array measurements. With analysis, it is shown that, under mild conditions the one-bit covariance matrix can be approximated by the sum of a scaled unquantized covariance matrix and a scaled identity matrix. Although the scaling parameters unknown because of the extreme quantization, they do not affect the subspace-based DOA estimators. Specifically, the signal and noise subspaces can be straightforwardly determined through the eigendecomposition of the one-bit covariance matrix, without pre"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1901.05109","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":"2026-05-17T23:47:39Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"5mfIGadTCs1OT8g+0Aa2WxFGZOMaxmJ0MgTTdtPDNFHONrKnLKrAjRgxLX2dAH7pQkXJA7KOqH4DfbkixHO6AA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-04T08:39:12.404744Z"},"content_sha256":"d1404d716918c7d2ce0f1106412423fe6e5817ffd3d7793093bff1cb9d64cc34","schema_version":"1.0","event_id":"sha256:d1404d716918c7d2ce0f1106412423fe6e5817ffd3d7793093bff1cb9d64cc34"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/6VFJI2PNM7WRDMRVSJTGCZZBRT/bundle.json","state_url":"https://pith.science/pith/6VFJI2PNM7WRDMRVSJTGCZZBRT/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/6VFJI2PNM7WRDMRVSJTGCZZBRT/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":"2026-07-04T08:39:12Z","links":{"resolver":"https://pith.science/pith/6VFJI2PNM7WRDMRVSJTGCZZBRT","bundle":"https://pith.science/pith/6VFJI2PNM7WRDMRVSJTGCZZBRT/bundle.json","state":"https://pith.science/pith/6VFJI2PNM7WRDMRVSJTGCZZBRT/state.json","well_known_bundle":"https://pith.science/.well-known/pith/6VFJI2PNM7WRDMRVSJTGCZZBRT/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2019:6VFJI2PNM7WRDMRVSJTGCZZBRT","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":"f6731ceb6ab35d1dba10aa95af114398a7958ff6ecf60314e02ec810d36f4617","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SP","submitted_at":"2019-01-16T02:06:53Z","title_canon_sha256":"654cdc09bc931bf6217d39a346b50eec6aa5a64c328e564189ed67b13b72c08b"},"schema_version":"1.0","source":{"id":"1901.05109","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1901.05109","created_at":"2026-05-17T23:47:39Z"},{"alias_kind":"arxiv_version","alias_value":"1901.05109v1","created_at":"2026-05-17T23:47:39Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1901.05109","created_at":"2026-05-17T23:47:39Z"},{"alias_kind":"pith_short_12","alias_value":"6VFJI2PNM7WR","created_at":"2026-05-18T12:33:10Z"},{"alias_kind":"pith_short_16","alias_value":"6VFJI2PNM7WRDMRV","created_at":"2026-05-18T12:33:10Z"},{"alias_kind":"pith_short_8","alias_value":"6VFJI2PN","created_at":"2026-05-18T12:33:10Z"}],"graph_snapshots":[{"event_id":"sha256:d1404d716918c7d2ce0f1106412423fe6e5817ffd3d7793093bff1cb9d64cc34","target":"graph","created_at":"2026-05-17T23:47:39Z","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":"In this letter, we consider the problem of direction-of-arrival (DOA) estimation with one-bit quantized array measurements. With analysis, it is shown that, under mild conditions the one-bit covariance matrix can be approximated by the sum of a scaled unquantized covariance matrix and a scaled identity matrix. Although the scaling parameters unknown because of the extreme quantization, they do not affect the subspace-based DOA estimators. Specifically, the signal and noise subspaces can be straightforwardly determined through the eigendecomposition of the one-bit covariance matrix, without pre","authors_text":"Bin Liao, Xiaodong Huang","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SP","submitted_at":"2019-01-16T02:06:53Z","title":"One-Bit MUSIC"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1901.05109","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":"sha256:4fb72c5676c9dd9fe00c25b7143ffd042d2bb59235a0f2d8a73de908b28d1014","target":"record","created_at":"2026-05-17T23:47:39Z","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":"f6731ceb6ab35d1dba10aa95af114398a7958ff6ecf60314e02ec810d36f4617","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SP","submitted_at":"2019-01-16T02:06:53Z","title_canon_sha256":"654cdc09bc931bf6217d39a346b50eec6aa5a64c328e564189ed67b13b72c08b"},"schema_version":"1.0","source":{"id":"1901.05109","kind":"arxiv","version":1}},"canonical_sha256":"f54a9469ed67ed11b23592666167218cd62c179f1d165153d1f7a088d1d5336c","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"f54a9469ed67ed11b23592666167218cd62c179f1d165153d1f7a088d1d5336c","first_computed_at":"2026-05-17T23:47:39.491133Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-17T23:47:39.491133Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"LDOR6/2Z/9P9PwyDsJvGAD6LShCMw51sl6pbLf/gO7YL9/WStGFNLJAi+YSoLjnTcWZ5/XxgJ9KkolDVeLN3Bg==","signature_status":"signed_v1","signed_at":"2026-05-17T23:47:39.491593Z","signed_message":"canonical_sha256_bytes"},"source_id":"1901.05109","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:4fb72c5676c9dd9fe00c25b7143ffd042d2bb59235a0f2d8a73de908b28d1014","sha256:d1404d716918c7d2ce0f1106412423fe6e5817ffd3d7793093bff1cb9d64cc34"],"state_sha256":"ee2220933537fe8c6a0414fa72ac49eaa5792100d121be57756c8f3341aed1e6"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"eWTvF1xwusEf7p7LXc31vuulGiFcGYqW+eoYmqtesgbidK0YnvcPKS/Bbx2kZek1HBNcHicCRY2PtpElmowmDA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-07-04T08:39:12.406551Z","bundle_sha256":"63d85c912bd3b09cc0c3019fd7b01cbaa2828aab9bfd4be1b9eb64cf587d2192"}}