{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2020:QBCCRAIFB66QS4EJL4IKXZXSZC","short_pith_number":"pith:QBCCRAIF","canonical_record":{"source":{"id":"2012.08046","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SP","submitted_at":"2020-12-15T02:17:02Z","cross_cats_sorted":[],"title_canon_sha256":"5e3314e7ec09a488b98c401d7c418c972503db23d0942f01ec93d052eef937a5","abstract_canon_sha256":"44ac4a68c35ab7585f90fd04ae2b918dc00d87ed3eb1966621b73c7f966c26bf"},"schema_version":"1.0"},"canonical_sha256":"80442881050fbd0970895f10abe6f2c899532662d6d704ef4b28c30d63aa9ff0","source":{"kind":"arxiv","id":"2012.08046","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2012.08046","created_at":"2026-07-05T01:59:39Z"},{"alias_kind":"arxiv_version","alias_value":"2012.08046v1","created_at":"2026-07-05T01:59:39Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2012.08046","created_at":"2026-07-05T01:59:39Z"},{"alias_kind":"pith_short_12","alias_value":"QBCCRAIFB66Q","created_at":"2026-07-05T01:59:39Z"},{"alias_kind":"pith_short_16","alias_value":"QBCCRAIFB66QS4EJ","created_at":"2026-07-05T01:59:39Z"},{"alias_kind":"pith_short_8","alias_value":"QBCCRAIF","created_at":"2026-07-05T01:59:39Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2020:QBCCRAIFB66QS4EJL4IKXZXSZC","target":"record","payload":{"canonical_record":{"source":{"id":"2012.08046","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SP","submitted_at":"2020-12-15T02:17:02Z","cross_cats_sorted":[],"title_canon_sha256":"5e3314e7ec09a488b98c401d7c418c972503db23d0942f01ec93d052eef937a5","abstract_canon_sha256":"44ac4a68c35ab7585f90fd04ae2b918dc00d87ed3eb1966621b73c7f966c26bf"},"schema_version":"1.0"},"canonical_sha256":"80442881050fbd0970895f10abe6f2c899532662d6d704ef4b28c30d63aa9ff0","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T01:59:39.278108Z","signature_b64":"EIns9HOjpBzD9w3yl+GNGAj2moIQhhwPq/uWlBGJ1laKZjE/FBvWSaBxX0Pb8dittP2byvajOl1Bd6xrax2GAA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"80442881050fbd0970895f10abe6f2c899532662d6d704ef4b28c30d63aa9ff0","last_reissued_at":"2026-07-05T01:59:39.277646Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T01:59:39.277646Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2012.08046","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":"2026-07-05T01:59:39Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"YPcYHRjN7Jaj9Nb36u9S+jWfX25FX/e/qPNA07XpgyL0MjAjNZW5pahkNtEyklUxptTFCzUmECnDfccnTEyHDg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-04T16:17:48.783596Z"},"content_sha256":"cc704176bc85a8006e9e57794dffd3fab473565d5d3c76820ea2eb1802246822","schema_version":"1.0","event_id":"sha256:cc704176bc85a8006e9e57794dffd3fab473565d5d3c76820ea2eb1802246822"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2020:QBCCRAIFB66QS4EJL4IKXZXSZC","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Wiener-Hammerstein model and its learning for nonlinear digital pre-distortion of optical transmitters","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"eess.SP","authors_text":"Asuka Matsushita, Etsushi Yamazaki, Kengo Horikoshi, Masanori Nakamura, Seiji Okamoto, Takeo Sasai, Yoshiaki Kisaka","submitted_at":"2020-12-15T02:17:02Z","abstract_excerpt":"We present a simple nonlinear digital pre-distortion (DPD) of optical transmitter components, which consists of concatenated blocks of a finite impulse response (FIR) filter, a memoryless nonlinear function and another FIR filter. The model is a Wiener-Hammerstein (WH) model and has essentially the same structure as neural networks or multilayer perceptions. This awareness enables one to achieve complexity-efficient DPD owing to the model-aware structure and exploit the well-developed optimization scheme in the machine learning field. The effectiveness of the method is assessed by electrical a"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2012.08046","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2012.08046/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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":"2026-07-05T01:59:39Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"oAgJIqNdzmSkIG63BeILo3Owbk1xSuty+fa5OTrlXw3dcktoH26neJ5d/gKqNkPVy3a4kGxhXsqWyvFaVFMrAA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-04T16:17:48.784389Z"},"content_sha256":"36eba9ab141034a26b326ddb156532640a5a5d8cd3de2456717c60dc0f9281bc","schema_version":"1.0","event_id":"sha256:36eba9ab141034a26b326ddb156532640a5a5d8cd3de2456717c60dc0f9281bc"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/QBCCRAIFB66QS4EJL4IKXZXSZC/bundle.json","state_url":"https://pith.science/pith/QBCCRAIFB66QS4EJL4IKXZXSZC/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/QBCCRAIFB66QS4EJL4IKXZXSZC/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":"2026-08-04T16:17:48Z","links":{"resolver":"https://pith.science/pith/QBCCRAIFB66QS4EJL4IKXZXSZC","bundle":"https://pith.science/pith/QBCCRAIFB66QS4EJL4IKXZXSZC/bundle.json","state":"https://pith.science/pith/QBCCRAIFB66QS4EJL4IKXZXSZC/state.json","well_known_bundle":"https://pith.science/.well-known/pith/QBCCRAIFB66QS4EJL4IKXZXSZC/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2020:QBCCRAIFB66QS4EJL4IKXZXSZC","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":"44ac4a68c35ab7585f90fd04ae2b918dc00d87ed3eb1966621b73c7f966c26bf","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SP","submitted_at":"2020-12-15T02:17:02Z","title_canon_sha256":"5e3314e7ec09a488b98c401d7c418c972503db23d0942f01ec93d052eef937a5"},"schema_version":"1.0","source":{"id":"2012.08046","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2012.08046","created_at":"2026-07-05T01:59:39Z"},{"alias_kind":"arxiv_version","alias_value":"2012.08046v1","created_at":"2026-07-05T01:59:39Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2012.08046","created_at":"2026-07-05T01:59:39Z"},{"alias_kind":"pith_short_12","alias_value":"QBCCRAIFB66Q","created_at":"2026-07-05T01:59:39Z"},{"alias_kind":"pith_short_16","alias_value":"QBCCRAIFB66QS4EJ","created_at":"2026-07-05T01:59:39Z"},{"alias_kind":"pith_short_8","alias_value":"QBCCRAIF","created_at":"2026-07-05T01:59:39Z"}],"graph_snapshots":[{"event_id":"sha256:36eba9ab141034a26b326ddb156532640a5a5d8cd3de2456717c60dc0f9281bc","target":"graph","created_at":"2026-07-05T01:59:39Z","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"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/2012.08046/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We present a simple nonlinear digital pre-distortion (DPD) of optical transmitter components, which consists of concatenated blocks of a finite impulse response (FIR) filter, a memoryless nonlinear function and another FIR filter. The model is a Wiener-Hammerstein (WH) model and has essentially the same structure as neural networks or multilayer perceptions. This awareness enables one to achieve complexity-efficient DPD owing to the model-aware structure and exploit the well-developed optimization scheme in the machine learning field. The effectiveness of the method is assessed by electrical a","authors_text":"Asuka Matsushita, Etsushi Yamazaki, Kengo Horikoshi, Masanori Nakamura, Seiji Okamoto, Takeo Sasai, Yoshiaki Kisaka","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SP","submitted_at":"2020-12-15T02:17:02Z","title":"Wiener-Hammerstein model and its learning for nonlinear digital pre-distortion of optical transmitters"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2012.08046","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:cc704176bc85a8006e9e57794dffd3fab473565d5d3c76820ea2eb1802246822","target":"record","created_at":"2026-07-05T01:59:39Z","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":"44ac4a68c35ab7585f90fd04ae2b918dc00d87ed3eb1966621b73c7f966c26bf","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SP","submitted_at":"2020-12-15T02:17:02Z","title_canon_sha256":"5e3314e7ec09a488b98c401d7c418c972503db23d0942f01ec93d052eef937a5"},"schema_version":"1.0","source":{"id":"2012.08046","kind":"arxiv","version":1}},"canonical_sha256":"80442881050fbd0970895f10abe6f2c899532662d6d704ef4b28c30d63aa9ff0","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"80442881050fbd0970895f10abe6f2c899532662d6d704ef4b28c30d63aa9ff0","first_computed_at":"2026-07-05T01:59:39.277646Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T01:59:39.277646Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"EIns9HOjpBzD9w3yl+GNGAj2moIQhhwPq/uWlBGJ1laKZjE/FBvWSaBxX0Pb8dittP2byvajOl1Bd6xrax2GAA==","signature_status":"signed_v1","signed_at":"2026-07-05T01:59:39.278108Z","signed_message":"canonical_sha256_bytes"},"source_id":"2012.08046","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:cc704176bc85a8006e9e57794dffd3fab473565d5d3c76820ea2eb1802246822","sha256:36eba9ab141034a26b326ddb156532640a5a5d8cd3de2456717c60dc0f9281bc"],"state_sha256":"6ca09d1449ea3efe3911f071cf220fb13558ff2a89d8ade874b360e75c2b41ec"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"43bkIFZIKym2FDd5nV6F0jP4Ld0y8SUfQ1NCEdISYUxIdx9iPJGYOzbwpFCIjFtwIg9QhnlEJ57Y0w4uD531Cg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-04T16:17:48.788619Z","bundle_sha256":"c2ff9f478d07b92391698db93e3065cbc0f2c78945a43b48de79352f596c1dd7"}}