{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2016:FRBEWJ6SFHYD2FDYNHWDMDH5FA","short_pith_number":"pith:FRBEWJ6S","canonical_record":{"source":{"id":"1610.02735","kind":"arxiv","version":4},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2016-10-09T22:33:51Z","cross_cats_sorted":["math.IT"],"title_canon_sha256":"33fe53b2475688e1d880efe22aeb062fd1ee42bb5954666a1aafbfd58edb23de","abstract_canon_sha256":"76a7541bfbd843091dc8e35396a358044deab6e6895b1affb3db4e8ef245abec"},"schema_version":"1.0"},"canonical_sha256":"2c424b27d229f03d147869ec360cfd2807167a4885c8b3ed7a8f21bde46246d7","source":{"kind":"arxiv","id":"1610.02735","version":4},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1610.02735","created_at":"2026-05-18T00:28:41Z"},{"alias_kind":"arxiv_version","alias_value":"1610.02735v4","created_at":"2026-05-18T00:28:41Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1610.02735","created_at":"2026-05-18T00:28:41Z"},{"alias_kind":"pith_short_12","alias_value":"FRBEWJ6SFHYD","created_at":"2026-05-18T12:30:15Z"},{"alias_kind":"pith_short_16","alias_value":"FRBEWJ6SFHYD2FDY","created_at":"2026-05-18T12:30:15Z"},{"alias_kind":"pith_short_8","alias_value":"FRBEWJ6S","created_at":"2026-05-18T12:30:15Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2016:FRBEWJ6SFHYD2FDYNHWDMDH5FA","target":"record","payload":{"canonical_record":{"source":{"id":"1610.02735","kind":"arxiv","version":4},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2016-10-09T22:33:51Z","cross_cats_sorted":["math.IT"],"title_canon_sha256":"33fe53b2475688e1d880efe22aeb062fd1ee42bb5954666a1aafbfd58edb23de","abstract_canon_sha256":"76a7541bfbd843091dc8e35396a358044deab6e6895b1affb3db4e8ef245abec"},"schema_version":"1.0"},"canonical_sha256":"2c424b27d229f03d147869ec360cfd2807167a4885c8b3ed7a8f21bde46246d7","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:28:41.202401Z","signature_b64":"IWcY27vobCNZKzyRjJJlpHfX7MxO3suyxbbAxBBorts0jPzUKStCcBFJfKEPwbOuHW7BXqXhsUPtXBPeI/bbAQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"2c424b27d229f03d147869ec360cfd2807167a4885c8b3ed7a8f21bde46246d7","last_reissued_at":"2026-05-18T00:28:41.201351Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:28:41.201351Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1610.02735","source_version":4,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T00:28:41Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"itmrF3+IWudCIJHtDrLBta1HWwtloWZ77SFZbuUUoXgb7WE1GJWyDIbFEB1iNXWECSbAVN/ED8CtcPD++NH5Bw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-04T13:47:32.306481Z"},"content_sha256":"e9cc4f4f13a090decac08fe83e3981f4845cb8f272b8dd7341e10169b625bdd0","schema_version":"1.0","event_id":"sha256:e9cc4f4f13a090decac08fe83e3981f4845cb8f272b8dd7341e10169b625bdd0"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2016:FRBEWJ6SFHYD2FDYNHWDMDH5FA","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Channel Estimation in Broadband Millimeter Wave MIMO Systems with Few-Bit ADCs","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["math.IT"],"primary_cat":"cs.IT","authors_text":"Jianhua Mo, Philip Schniter, Robert W. Heath Jr","submitted_at":"2016-10-09T22:33:51Z","abstract_excerpt":"We develop a broadband channel estimation algorithm for millimeter wave (mmWave) multiple input multiple output (MIMO) systems with few-bit analog-to-digital converters (ADCs). Our methodology exploits the joint sparsity of the mmWave MIMO channel in the angle and delay domains. We formulate the estimation problem as a noisy quantized compressed-sensing problem and solve it using efficient approximate message passing (AMP) algorithms. In particular, we model the angle-delay coefficients using a Bernoulli-Gaussian-mixture distribution with unknown parameters and use the expectation-maximization"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1610.02735","kind":"arxiv","version":4},"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":"2026-05-18T00:28:41Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"3ldbTHeG7ULWaAQ3LVavnAkrJ2RacWG8V4pjctTvCJFCT8LQkEgMXFOkEcSPBTS8W1wD7xlZmv6l6VQB7AgVCQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-04T13:47:32.306826Z"},"content_sha256":"40042f2e95fd656474b761955667f3b5d69e89b5343c22a6cfd1529f57cbf45d","schema_version":"1.0","event_id":"sha256:40042f2e95fd656474b761955667f3b5d69e89b5343c22a6cfd1529f57cbf45d"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/FRBEWJ6SFHYD2FDYNHWDMDH5FA/bundle.json","state_url":"https://pith.science/pith/FRBEWJ6SFHYD2FDYNHWDMDH5FA/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/FRBEWJ6SFHYD2FDYNHWDMDH5FA/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":"2026-06-04T13:47:32Z","links":{"resolver":"https://pith.science/pith/FRBEWJ6SFHYD2FDYNHWDMDH5FA","bundle":"https://pith.science/pith/FRBEWJ6SFHYD2FDYNHWDMDH5FA/bundle.json","state":"https://pith.science/pith/FRBEWJ6SFHYD2FDYNHWDMDH5FA/state.json","well_known_bundle":"https://pith.science/.well-known/pith/FRBEWJ6SFHYD2FDYNHWDMDH5FA/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2016:FRBEWJ6SFHYD2FDYNHWDMDH5FA","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":"76a7541bfbd843091dc8e35396a358044deab6e6895b1affb3db4e8ef245abec","cross_cats_sorted":["math.IT"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2016-10-09T22:33:51Z","title_canon_sha256":"33fe53b2475688e1d880efe22aeb062fd1ee42bb5954666a1aafbfd58edb23de"},"schema_version":"1.0","source":{"id":"1610.02735","kind":"arxiv","version":4}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1610.02735","created_at":"2026-05-18T00:28:41Z"},{"alias_kind":"arxiv_version","alias_value":"1610.02735v4","created_at":"2026-05-18T00:28:41Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1610.02735","created_at":"2026-05-18T00:28:41Z"},{"alias_kind":"pith_short_12","alias_value":"FRBEWJ6SFHYD","created_at":"2026-05-18T12:30:15Z"},{"alias_kind":"pith_short_16","alias_value":"FRBEWJ6SFHYD2FDY","created_at":"2026-05-18T12:30:15Z"},{"alias_kind":"pith_short_8","alias_value":"FRBEWJ6S","created_at":"2026-05-18T12:30:15Z"}],"graph_snapshots":[{"event_id":"sha256:40042f2e95fd656474b761955667f3b5d69e89b5343c22a6cfd1529f57cbf45d","target":"graph","created_at":"2026-05-18T00:28:41Z","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":"We develop a broadband channel estimation algorithm for millimeter wave (mmWave) multiple input multiple output (MIMO) systems with few-bit analog-to-digital converters (ADCs). Our methodology exploits the joint sparsity of the mmWave MIMO channel in the angle and delay domains. We formulate the estimation problem as a noisy quantized compressed-sensing problem and solve it using efficient approximate message passing (AMP) algorithms. In particular, we model the angle-delay coefficients using a Bernoulli-Gaussian-mixture distribution with unknown parameters and use the expectation-maximization","authors_text":"Jianhua Mo, Philip Schniter, Robert W. Heath Jr","cross_cats":["math.IT"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2016-10-09T22:33:51Z","title":"Channel Estimation in Broadband Millimeter Wave MIMO Systems with Few-Bit ADCs"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1610.02735","kind":"arxiv","version":4},"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:e9cc4f4f13a090decac08fe83e3981f4845cb8f272b8dd7341e10169b625bdd0","target":"record","created_at":"2026-05-18T00:28:41Z","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":"76a7541bfbd843091dc8e35396a358044deab6e6895b1affb3db4e8ef245abec","cross_cats_sorted":["math.IT"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2016-10-09T22:33:51Z","title_canon_sha256":"33fe53b2475688e1d880efe22aeb062fd1ee42bb5954666a1aafbfd58edb23de"},"schema_version":"1.0","source":{"id":"1610.02735","kind":"arxiv","version":4}},"canonical_sha256":"2c424b27d229f03d147869ec360cfd2807167a4885c8b3ed7a8f21bde46246d7","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"2c424b27d229f03d147869ec360cfd2807167a4885c8b3ed7a8f21bde46246d7","first_computed_at":"2026-05-18T00:28:41.201351Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:28:41.201351Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"IWcY27vobCNZKzyRjJJlpHfX7MxO3suyxbbAxBBorts0jPzUKStCcBFJfKEPwbOuHW7BXqXhsUPtXBPeI/bbAQ==","signature_status":"signed_v1","signed_at":"2026-05-18T00:28:41.202401Z","signed_message":"canonical_sha256_bytes"},"source_id":"1610.02735","source_kind":"arxiv","source_version":4}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:e9cc4f4f13a090decac08fe83e3981f4845cb8f272b8dd7341e10169b625bdd0","sha256:40042f2e95fd656474b761955667f3b5d69e89b5343c22a6cfd1529f57cbf45d"],"state_sha256":"721d2a479630b8fa07e19943aa019c061f9d783a9f196cb3be4ada86cd4a8df0"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"RQ71wAzE+9uws/bbNgA13O0VXfVjdZQcYbG8e2AqezMAS6QVmiCAR3UkbkC9Ouq82/rfm7Cmb9uo2E4phIVzCg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-04T13:47:32.308839Z","bundle_sha256":"c5b14b6e0dc00b0196162b32e6567f48774afd6993133e5aced2fe7da65779b3"}}