{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:CYSH2NOS3HBZ5DLROOJ55575JC","short_pith_number":"pith:CYSH2NOS","canonical_record":{"source":{"id":"1802.03706","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2018-02-11T08:07:40Z","cross_cats_sorted":["math.IT"],"title_canon_sha256":"6605ff345e144975d2806f5fb0988ff233c01d891673f95f9f7b24a220672441","abstract_canon_sha256":"46f44aef1fd98aaaf941f3275cd0f82cc8db9d7850b21453713470115c5de0bb"},"schema_version":"1.0"},"canonical_sha256":"16247d35d2d9c39e8d717393def7fd4889d1e59a48339f15becde78b267677b2","source":{"kind":"arxiv","id":"1802.03706","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1802.03706","created_at":"2026-05-18T00:23:50Z"},{"alias_kind":"arxiv_version","alias_value":"1802.03706v1","created_at":"2026-05-18T00:23:50Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1802.03706","created_at":"2026-05-18T00:23:50Z"},{"alias_kind":"pith_short_12","alias_value":"CYSH2NOS3HBZ","created_at":"2026-05-18T12:32:19Z"},{"alias_kind":"pith_short_16","alias_value":"CYSH2NOS3HBZ5DLR","created_at":"2026-05-18T12:32:19Z"},{"alias_kind":"pith_short_8","alias_value":"CYSH2NOS","created_at":"2026-05-18T12:32:19Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:CYSH2NOS3HBZ5DLROOJ55575JC","target":"record","payload":{"canonical_record":{"source":{"id":"1802.03706","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2018-02-11T08:07:40Z","cross_cats_sorted":["math.IT"],"title_canon_sha256":"6605ff345e144975d2806f5fb0988ff233c01d891673f95f9f7b24a220672441","abstract_canon_sha256":"46f44aef1fd98aaaf941f3275cd0f82cc8db9d7850b21453713470115c5de0bb"},"schema_version":"1.0"},"canonical_sha256":"16247d35d2d9c39e8d717393def7fd4889d1e59a48339f15becde78b267677b2","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:23:50.699823Z","signature_b64":"5y3TpzZvOyNSkee0bwYZ1u5q5VUJfznai8Ov4k+mQ4rvvahEDck1m1jWVHcX6rUrHMjLFg8kfiGKEW6WiXKaBg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"16247d35d2d9c39e8d717393def7fd4889d1e59a48339f15becde78b267677b2","last_reissued_at":"2026-05-18T00:23:50.699259Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:23:50.699259Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1802.03706","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":"2026-05-18T00:23:50Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"jppuCWpAVjnFHQYvpXx7wENdMc+SXVchivoit0MFEeoakC7fE207DzMTkgqRfeF76XyD8pJEEDZQGCS2HtiiAA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-27T18:21:43.869896Z"},"content_sha256":"f004a4db00ffd640cbf146df52c01a82a82541fafb4c1dfd15170cedebc85137","schema_version":"1.0","event_id":"sha256:f004a4db00ffd640cbf146df52c01a82a82541fafb4c1dfd15170cedebc85137"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:CYSH2NOS3HBZ5DLROOJ55575JC","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"FDM-Structured Preamble Optimization for Channel Estimation in MIMO-OQAM/FBMC Systems","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["math.IT"],"primary_cat":"cs.IT","authors_text":"Da Chen, Daiming Qu, Kai Luo, Tao Jiang, Wenfeng Liu","submitted_at":"2018-02-11T08:07:40Z","abstract_excerpt":"In this paper, we consider the problem of preamble design in multiple-input multiple-output (MIMO) systems employing offset quadrature amplitude modulation based filter bank multicarrier (OQAM/FBMC) and propose a preamble optimization method for the frequency division multiplexing (FDM)-structured preamble. Specifically, we formulate an optimization problem to determine the frequency division multiplexed preambles, where the objective is to minimize the mean square error (MSE) of the channel estimation, subject to the constraint on the transmit energy. For two transmit antennas, we find the re"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1802.03706","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":"2026-05-18T00:23:50Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"DwnUKBSDhMuSwGXbjIOI9R1yqnHvXxh/9BeuXugpfnj4E4PSgdoqUv5bMd5j4ubbH15xd7t50Zl1F1+di0tMDQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-27T18:21:43.870615Z"},"content_sha256":"29eb7964289621db029dc6ad792b85b0ac223556cc25ad38d1f0632c15b50fcc","schema_version":"1.0","event_id":"sha256:29eb7964289621db029dc6ad792b85b0ac223556cc25ad38d1f0632c15b50fcc"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/CYSH2NOS3HBZ5DLROOJ55575JC/bundle.json","state_url":"https://pith.science/pith/CYSH2NOS3HBZ5DLROOJ55575JC/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/CYSH2NOS3HBZ5DLROOJ55575JC/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":"2026-05-27T18:21:43Z","links":{"resolver":"https://pith.science/pith/CYSH2NOS3HBZ5DLROOJ55575JC","bundle":"https://pith.science/pith/CYSH2NOS3HBZ5DLROOJ55575JC/bundle.json","state":"https://pith.science/pith/CYSH2NOS3HBZ5DLROOJ55575JC/state.json","well_known_bundle":"https://pith.science/.well-known/pith/CYSH2NOS3HBZ5DLROOJ55575JC/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:CYSH2NOS3HBZ5DLROOJ55575JC","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":"46f44aef1fd98aaaf941f3275cd0f82cc8db9d7850b21453713470115c5de0bb","cross_cats_sorted":["math.IT"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2018-02-11T08:07:40Z","title_canon_sha256":"6605ff345e144975d2806f5fb0988ff233c01d891673f95f9f7b24a220672441"},"schema_version":"1.0","source":{"id":"1802.03706","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1802.03706","created_at":"2026-05-18T00:23:50Z"},{"alias_kind":"arxiv_version","alias_value":"1802.03706v1","created_at":"2026-05-18T00:23:50Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1802.03706","created_at":"2026-05-18T00:23:50Z"},{"alias_kind":"pith_short_12","alias_value":"CYSH2NOS3HBZ","created_at":"2026-05-18T12:32:19Z"},{"alias_kind":"pith_short_16","alias_value":"CYSH2NOS3HBZ5DLR","created_at":"2026-05-18T12:32:19Z"},{"alias_kind":"pith_short_8","alias_value":"CYSH2NOS","created_at":"2026-05-18T12:32:19Z"}],"graph_snapshots":[{"event_id":"sha256:29eb7964289621db029dc6ad792b85b0ac223556cc25ad38d1f0632c15b50fcc","target":"graph","created_at":"2026-05-18T00:23:50Z","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 consider the problem of preamble design in multiple-input multiple-output (MIMO) systems employing offset quadrature amplitude modulation based filter bank multicarrier (OQAM/FBMC) and propose a preamble optimization method for the frequency division multiplexing (FDM)-structured preamble. Specifically, we formulate an optimization problem to determine the frequency division multiplexed preambles, where the objective is to minimize the mean square error (MSE) of the channel estimation, subject to the constraint on the transmit energy. For two transmit antennas, we find the re","authors_text":"Da Chen, Daiming Qu, Kai Luo, Tao Jiang, Wenfeng Liu","cross_cats":["math.IT"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2018-02-11T08:07:40Z","title":"FDM-Structured Preamble Optimization for Channel Estimation in MIMO-OQAM/FBMC Systems"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1802.03706","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:f004a4db00ffd640cbf146df52c01a82a82541fafb4c1dfd15170cedebc85137","target":"record","created_at":"2026-05-18T00:23:50Z","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":"46f44aef1fd98aaaf941f3275cd0f82cc8db9d7850b21453713470115c5de0bb","cross_cats_sorted":["math.IT"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2018-02-11T08:07:40Z","title_canon_sha256":"6605ff345e144975d2806f5fb0988ff233c01d891673f95f9f7b24a220672441"},"schema_version":"1.0","source":{"id":"1802.03706","kind":"arxiv","version":1}},"canonical_sha256":"16247d35d2d9c39e8d717393def7fd4889d1e59a48339f15becde78b267677b2","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"16247d35d2d9c39e8d717393def7fd4889d1e59a48339f15becde78b267677b2","first_computed_at":"2026-05-18T00:23:50.699259Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:23:50.699259Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"5y3TpzZvOyNSkee0bwYZ1u5q5VUJfznai8Ov4k+mQ4rvvahEDck1m1jWVHcX6rUrHMjLFg8kfiGKEW6WiXKaBg==","signature_status":"signed_v1","signed_at":"2026-05-18T00:23:50.699823Z","signed_message":"canonical_sha256_bytes"},"source_id":"1802.03706","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:f004a4db00ffd640cbf146df52c01a82a82541fafb4c1dfd15170cedebc85137","sha256:29eb7964289621db029dc6ad792b85b0ac223556cc25ad38d1f0632c15b50fcc"],"state_sha256":"66ecd901877bf602a488c447541ab881ec9396b8ca0fbee76d50de564d637289"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"3fdIacywBG2BY/2PPZkqygRonvIRPZvIphvP4byCNwu6bv1oXd/2sz3QHRvUIZrH2AA7Al/kFZstcraAf78kDw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-27T18:21:43.873776Z","bundle_sha256":"5c3330a1cd191d320b6deb88036a5c9b531a86922b77a2067fe61b0ba38273d9"}}