{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2017:QYCVX62UXQEBAA7BUOQW5OP7OJ","short_pith_number":"pith:QYCVX62U","canonical_record":{"source":{"id":"1703.01643","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2017-03-05T18:52:52Z","cross_cats_sorted":["math.IT"],"title_canon_sha256":"f4abcc6cd92eab3982f3338f0930cd04474a3ba3288bd252354f3bfcbff3d41e","abstract_canon_sha256":"63e1c59b8a0f35f1a584e2efe817bfa392b4a34c7aaa54837f48ddb6ed3b097e"},"schema_version":"1.0"},"canonical_sha256":"86055bfb54bc081003e1a3a16eb9ff7267a17a2024a7f870c9f923821f300388","source":{"kind":"arxiv","id":"1703.01643","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1703.01643","created_at":"2026-05-18T00:41:36Z"},{"alias_kind":"arxiv_version","alias_value":"1703.01643v2","created_at":"2026-05-18T00:41:36Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1703.01643","created_at":"2026-05-18T00:41:36Z"},{"alias_kind":"pith_short_12","alias_value":"QYCVX62UXQEB","created_at":"2026-05-18T12:31:39Z"},{"alias_kind":"pith_short_16","alias_value":"QYCVX62UXQEBAA7B","created_at":"2026-05-18T12:31:39Z"},{"alias_kind":"pith_short_8","alias_value":"QYCVX62U","created_at":"2026-05-18T12:31:39Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2017:QYCVX62UXQEBAA7BUOQW5OP7OJ","target":"record","payload":{"canonical_record":{"source":{"id":"1703.01643","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2017-03-05T18:52:52Z","cross_cats_sorted":["math.IT"],"title_canon_sha256":"f4abcc6cd92eab3982f3338f0930cd04474a3ba3288bd252354f3bfcbff3d41e","abstract_canon_sha256":"63e1c59b8a0f35f1a584e2efe817bfa392b4a34c7aaa54837f48ddb6ed3b097e"},"schema_version":"1.0"},"canonical_sha256":"86055bfb54bc081003e1a3a16eb9ff7267a17a2024a7f870c9f923821f300388","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:41:36.631347Z","signature_b64":"g5iNl9YXttEeUMORjM6LsHvV0V8RWF1Zt+7QUzXLZMfhGoCJQ0Aa39LzyCjt3+xw+SshrI0LD2FMgHHTr2B8Aw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"86055bfb54bc081003e1a3a16eb9ff7267a17a2024a7f870c9f923821f300388","last_reissued_at":"2026-05-18T00:41:36.630606Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:41:36.630606Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1703.01643","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T00:41:36Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"5G1yDAsNAAes83Mt3VYVMngpkWD2L9rR1IjYfz//catjvrdaNNNwKtF3djwmdGD6RkU9S1LmFof5Hze2AQQlDQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-25T08:53:20.389003Z"},"content_sha256":"6531459ee3b71ac48ac76babdbb18c4dd3bebb2106661a9a6cd70eef2f12aa65","schema_version":"1.0","event_id":"sha256:6531459ee3b71ac48ac76babdbb18c4dd3bebb2106661a9a6cd70eef2f12aa65"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2017:QYCVX62UXQEBAA7BUOQW5OP7OJ","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Faster-than-Nyquist Non-Orthogonal Frequency-Division Multiplexing for Visible Light Communications","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["math.IT"],"primary_cat":"cs.IT","authors_text":"Aiying Yang, Jinlong Wei, Ji Zhou, Qi Wang, Qixiang Cheng, Tiantian Zhang, Yaojun Qiao, Yueming Lu, Zhanyu Yang","submitted_at":"2017-03-05T18:52:52Z","abstract_excerpt":"In this paper, we propose a faster-than-Nyquist (FTN) non-orthogonal frequency-division multiplexing (NOFDM) scheme for visible light communications (VLC) where the multiplexing/demultiplexing employs the inverse fractional cosine transform (IFrCT)/FrCT. Different to the common fractional Fourier transform-based NOFDM (FrFT-NOFDM) signal, FrCT-based NOFDM (FrCT-NOFDM) signal is real-valued which can be directly applied to the VLC systems without the expensive upconversion. Thus, FrCT-NOFDM is more suitable for the cost-sensitive VLC systems. Meanwhile, under the same transmission rate, FrCT-NO"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1703.01643","kind":"arxiv","version":2},"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":"2026-05-18T00:41:36Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"IXBXMjrW3MIVFLYsMMEaqOTkDnGAv4k/nyqXpjYI/BVrof39kdea15gz0j2IcPu2Tj/nNCpj63ksmdPsqCSVAg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-25T08:53:20.389682Z"},"content_sha256":"d0f6194db6aa9a88cc48528d5013a729da4c4aa00d0d82f03f7b873cd57d53ad","schema_version":"1.0","event_id":"sha256:d0f6194db6aa9a88cc48528d5013a729da4c4aa00d0d82f03f7b873cd57d53ad"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/QYCVX62UXQEBAA7BUOQW5OP7OJ/bundle.json","state_url":"https://pith.science/pith/QYCVX62UXQEBAA7BUOQW5OP7OJ/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/QYCVX62UXQEBAA7BUOQW5OP7OJ/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":"2026-05-25T08:53:20Z","links":{"resolver":"https://pith.science/pith/QYCVX62UXQEBAA7BUOQW5OP7OJ","bundle":"https://pith.science/pith/QYCVX62UXQEBAA7BUOQW5OP7OJ/bundle.json","state":"https://pith.science/pith/QYCVX62UXQEBAA7BUOQW5OP7OJ/state.json","well_known_bundle":"https://pith.science/.well-known/pith/QYCVX62UXQEBAA7BUOQW5OP7OJ/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2017:QYCVX62UXQEBAA7BUOQW5OP7OJ","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":"63e1c59b8a0f35f1a584e2efe817bfa392b4a34c7aaa54837f48ddb6ed3b097e","cross_cats_sorted":["math.IT"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2017-03-05T18:52:52Z","title_canon_sha256":"f4abcc6cd92eab3982f3338f0930cd04474a3ba3288bd252354f3bfcbff3d41e"},"schema_version":"1.0","source":{"id":"1703.01643","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1703.01643","created_at":"2026-05-18T00:41:36Z"},{"alias_kind":"arxiv_version","alias_value":"1703.01643v2","created_at":"2026-05-18T00:41:36Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1703.01643","created_at":"2026-05-18T00:41:36Z"},{"alias_kind":"pith_short_12","alias_value":"QYCVX62UXQEB","created_at":"2026-05-18T12:31:39Z"},{"alias_kind":"pith_short_16","alias_value":"QYCVX62UXQEBAA7B","created_at":"2026-05-18T12:31:39Z"},{"alias_kind":"pith_short_8","alias_value":"QYCVX62U","created_at":"2026-05-18T12:31:39Z"}],"graph_snapshots":[{"event_id":"sha256:d0f6194db6aa9a88cc48528d5013a729da4c4aa00d0d82f03f7b873cd57d53ad","target":"graph","created_at":"2026-05-18T00:41:36Z","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 faster-than-Nyquist (FTN) non-orthogonal frequency-division multiplexing (NOFDM) scheme for visible light communications (VLC) where the multiplexing/demultiplexing employs the inverse fractional cosine transform (IFrCT)/FrCT. Different to the common fractional Fourier transform-based NOFDM (FrFT-NOFDM) signal, FrCT-based NOFDM (FrCT-NOFDM) signal is real-valued which can be directly applied to the VLC systems without the expensive upconversion. Thus, FrCT-NOFDM is more suitable for the cost-sensitive VLC systems. Meanwhile, under the same transmission rate, FrCT-NO","authors_text":"Aiying Yang, Jinlong Wei, Ji Zhou, Qi Wang, Qixiang Cheng, Tiantian Zhang, Yaojun Qiao, Yueming Lu, Zhanyu Yang","cross_cats":["math.IT"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2017-03-05T18:52:52Z","title":"Faster-than-Nyquist Non-Orthogonal Frequency-Division Multiplexing for Visible Light Communications"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1703.01643","kind":"arxiv","version":2},"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":"sha256:6531459ee3b71ac48ac76babdbb18c4dd3bebb2106661a9a6cd70eef2f12aa65","target":"record","created_at":"2026-05-18T00:41:36Z","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":"63e1c59b8a0f35f1a584e2efe817bfa392b4a34c7aaa54837f48ddb6ed3b097e","cross_cats_sorted":["math.IT"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2017-03-05T18:52:52Z","title_canon_sha256":"f4abcc6cd92eab3982f3338f0930cd04474a3ba3288bd252354f3bfcbff3d41e"},"schema_version":"1.0","source":{"id":"1703.01643","kind":"arxiv","version":2}},"canonical_sha256":"86055bfb54bc081003e1a3a16eb9ff7267a17a2024a7f870c9f923821f300388","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"86055bfb54bc081003e1a3a16eb9ff7267a17a2024a7f870c9f923821f300388","first_computed_at":"2026-05-18T00:41:36.630606Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:41:36.630606Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"g5iNl9YXttEeUMORjM6LsHvV0V8RWF1Zt+7QUzXLZMfhGoCJQ0Aa39LzyCjt3+xw+SshrI0LD2FMgHHTr2B8Aw==","signature_status":"signed_v1","signed_at":"2026-05-18T00:41:36.631347Z","signed_message":"canonical_sha256_bytes"},"source_id":"1703.01643","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:6531459ee3b71ac48ac76babdbb18c4dd3bebb2106661a9a6cd70eef2f12aa65","sha256:d0f6194db6aa9a88cc48528d5013a729da4c4aa00d0d82f03f7b873cd57d53ad"],"state_sha256":"326af7fcbd4f8dfce19b6a465aba8a7bf5239c845eb6d46538e9abfc2de411d7"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"TxN6SaDLOM41Myah8tIsEdbXNrwYBQIIue9QaTOwJVK3uCUvCaHE1fEh3jVTHpEgdm4Liw0y2vS6H4uzim0RBg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-25T08:53:20.394482Z","bundle_sha256":"bd70ef7fd3cdcbfca76ae52dfdb8908486b17369d5bb401f88b2a1d8dc290220"}}