{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2017:4L7QVLEI4JJADKVN4HMHTLRMUS","short_pith_number":"pith:4L7QVLEI","canonical_record":{"source":{"id":"1703.04399","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2017-03-13T14:01:21Z","cross_cats_sorted":["math.IT"],"title_canon_sha256":"da5a8cc909a3147c0faca377017b04f3f3ef92c2d71d87e4e052a95feb0253e4","abstract_canon_sha256":"b11bdc480621e12b71df21160c5043011d2fd92556319d5cf7bec3d5b89ff135"},"schema_version":"1.0"},"canonical_sha256":"e2ff0aac88e25201aaade1d879ae2ca4b170803f736d8e5ca7ac41124fb4cf5c","source":{"kind":"arxiv","id":"1703.04399","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1703.04399","created_at":"2026-05-18T00:48:48Z"},{"alias_kind":"arxiv_version","alias_value":"1703.04399v1","created_at":"2026-05-18T00:48:48Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1703.04399","created_at":"2026-05-18T00:48:48Z"},{"alias_kind":"pith_short_12","alias_value":"4L7QVLEI4JJA","created_at":"2026-05-18T12:31:00Z"},{"alias_kind":"pith_short_16","alias_value":"4L7QVLEI4JJADKVN","created_at":"2026-05-18T12:31:00Z"},{"alias_kind":"pith_short_8","alias_value":"4L7QVLEI","created_at":"2026-05-18T12:31:00Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2017:4L7QVLEI4JJADKVN4HMHTLRMUS","target":"record","payload":{"canonical_record":{"source":{"id":"1703.04399","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2017-03-13T14:01:21Z","cross_cats_sorted":["math.IT"],"title_canon_sha256":"da5a8cc909a3147c0faca377017b04f3f3ef92c2d71d87e4e052a95feb0253e4","abstract_canon_sha256":"b11bdc480621e12b71df21160c5043011d2fd92556319d5cf7bec3d5b89ff135"},"schema_version":"1.0"},"canonical_sha256":"e2ff0aac88e25201aaade1d879ae2ca4b170803f736d8e5ca7ac41124fb4cf5c","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:48:48.776142Z","signature_b64":"mVHJ8F+7MlB/3a+dJU5IgHgQZUQCtnFCIYLS/4t5fT5cLPnNOArHMc43SdBK0Xc0LKyLBP+YaJW30Wc6Hoi4Bw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"e2ff0aac88e25201aaade1d879ae2ca4b170803f736d8e5ca7ac41124fb4cf5c","last_reissued_at":"2026-05-18T00:48:48.775490Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:48:48.775490Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1703.04399","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":"2026-05-18T00:48:48Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"MyVzf0vCL0FYAVUX869XH5NK5JekX+ap3xrP55sQLoyQWo1UNA5cw4XfV+NXgqSHKT3p1/rCjcc37rNtiylLCg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-10T00:06:42.049493Z"},"content_sha256":"e41212a04da312e400abc77153d6cbdb47aba9682e0f90b67e17a9df6a05a6b8","schema_version":"1.0","event_id":"sha256:e41212a04da312e400abc77153d6cbdb47aba9682e0f90b67e17a9df6a05a6b8"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2017:4L7QVLEI4JJADKVN4HMHTLRMUS","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Frequency Synchronization for Uplink Massive MIMO Systems","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["math.IT"],"primary_cat":"cs.IT","authors_text":"Feifei Gao, Hai Lin, Shi Jin, Weile Zhang","submitted_at":"2017-03-13T14:01:21Z","abstract_excerpt":"In this paper, we propose a frequency synchronization scheme for multiuser orthogonal frequency division multiplexing (OFDM) uplink with a large-scale uniform linear array (ULA) at base station (BS) by exploiting the angle information of users. Considering that the incident signal at BS from each user can be restricted within a certain angular spread, the proposed scheme could perform carrier frequency offset (CFO) estimation for each user individually through a \\textit{joint spatial-frequency alignment} procedure and can be completed efficiently with the aided of fast Fourier transform (FFT)."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1703.04399","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":"2026-05-18T00:48:48Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"KsbFuDgnlLtlpayCcyKpY19vRW+JMQbgLI3mcsSULwH0iUc9Y+CoOXNwa8bXLSkOrQFbp6ZcH1mw2W6sfQXlCw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-10T00:06:42.050192Z"},"content_sha256":"3b244274d4d47f452c3d57edca27eaa984b0218d7fe2980aaf16293e074213ba","schema_version":"1.0","event_id":"sha256:3b244274d4d47f452c3d57edca27eaa984b0218d7fe2980aaf16293e074213ba"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/4L7QVLEI4JJADKVN4HMHTLRMUS/bundle.json","state_url":"https://pith.science/pith/4L7QVLEI4JJADKVN4HMHTLRMUS/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/4L7QVLEI4JJADKVN4HMHTLRMUS/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":"2026-06-10T00:06:42Z","links":{"resolver":"https://pith.science/pith/4L7QVLEI4JJADKVN4HMHTLRMUS","bundle":"https://pith.science/pith/4L7QVLEI4JJADKVN4HMHTLRMUS/bundle.json","state":"https://pith.science/pith/4L7QVLEI4JJADKVN4HMHTLRMUS/state.json","well_known_bundle":"https://pith.science/.well-known/pith/4L7QVLEI4JJADKVN4HMHTLRMUS/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2017:4L7QVLEI4JJADKVN4HMHTLRMUS","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":"b11bdc480621e12b71df21160c5043011d2fd92556319d5cf7bec3d5b89ff135","cross_cats_sorted":["math.IT"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2017-03-13T14:01:21Z","title_canon_sha256":"da5a8cc909a3147c0faca377017b04f3f3ef92c2d71d87e4e052a95feb0253e4"},"schema_version":"1.0","source":{"id":"1703.04399","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1703.04399","created_at":"2026-05-18T00:48:48Z"},{"alias_kind":"arxiv_version","alias_value":"1703.04399v1","created_at":"2026-05-18T00:48:48Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1703.04399","created_at":"2026-05-18T00:48:48Z"},{"alias_kind":"pith_short_12","alias_value":"4L7QVLEI4JJA","created_at":"2026-05-18T12:31:00Z"},{"alias_kind":"pith_short_16","alias_value":"4L7QVLEI4JJADKVN","created_at":"2026-05-18T12:31:00Z"},{"alias_kind":"pith_short_8","alias_value":"4L7QVLEI","created_at":"2026-05-18T12:31:00Z"}],"graph_snapshots":[{"event_id":"sha256:3b244274d4d47f452c3d57edca27eaa984b0218d7fe2980aaf16293e074213ba","target":"graph","created_at":"2026-05-18T00:48:48Z","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 paper, we propose a frequency synchronization scheme for multiuser orthogonal frequency division multiplexing (OFDM) uplink with a large-scale uniform linear array (ULA) at base station (BS) by exploiting the angle information of users. Considering that the incident signal at BS from each user can be restricted within a certain angular spread, the proposed scheme could perform carrier frequency offset (CFO) estimation for each user individually through a \\textit{joint spatial-frequency alignment} procedure and can be completed efficiently with the aided of fast Fourier transform (FFT).","authors_text":"Feifei Gao, Hai Lin, Shi Jin, Weile Zhang","cross_cats":["math.IT"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2017-03-13T14:01:21Z","title":"Frequency Synchronization for Uplink Massive MIMO Systems"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1703.04399","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:e41212a04da312e400abc77153d6cbdb47aba9682e0f90b67e17a9df6a05a6b8","target":"record","created_at":"2026-05-18T00:48:48Z","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":"b11bdc480621e12b71df21160c5043011d2fd92556319d5cf7bec3d5b89ff135","cross_cats_sorted":["math.IT"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2017-03-13T14:01:21Z","title_canon_sha256":"da5a8cc909a3147c0faca377017b04f3f3ef92c2d71d87e4e052a95feb0253e4"},"schema_version":"1.0","source":{"id":"1703.04399","kind":"arxiv","version":1}},"canonical_sha256":"e2ff0aac88e25201aaade1d879ae2ca4b170803f736d8e5ca7ac41124fb4cf5c","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"e2ff0aac88e25201aaade1d879ae2ca4b170803f736d8e5ca7ac41124fb4cf5c","first_computed_at":"2026-05-18T00:48:48.775490Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:48:48.775490Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"mVHJ8F+7MlB/3a+dJU5IgHgQZUQCtnFCIYLS/4t5fT5cLPnNOArHMc43SdBK0Xc0LKyLBP+YaJW30Wc6Hoi4Bw==","signature_status":"signed_v1","signed_at":"2026-05-18T00:48:48.776142Z","signed_message":"canonical_sha256_bytes"},"source_id":"1703.04399","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:e41212a04da312e400abc77153d6cbdb47aba9682e0f90b67e17a9df6a05a6b8","sha256:3b244274d4d47f452c3d57edca27eaa984b0218d7fe2980aaf16293e074213ba"],"state_sha256":"63c7e9f4a9dccf2a85fd1fe8c74ee6e5a876d8834c804d958571d93a4c847fc6"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"dc02HyJwxeqhRt28C6Ag/4MMXKQnYWf6YzCA86hoI0tMJpAwRYAu4AJpSglin/HGVutC3djlWdlP8CDZ/Eb6CQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-10T00:06:42.054025Z","bundle_sha256":"81967e158bc10eee67c5fcb57d9609a6ea52032914c0900f3978e15fa678e6fb"}}