{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:RLZMQJDU2WJIIXMVM6UBZOGSV4","short_pith_number":"pith:RLZMQJDU","canonical_record":{"source":{"id":"1802.01133","kind":"arxiv","version":4},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2018-02-04T14:35:28Z","cross_cats_sorted":["math.IT"],"title_canon_sha256":"b2a0fa410f0af7ddbb9bb91243ae4db1fdc09015954f012d2c1593923da2c80d","abstract_canon_sha256":"0f3fc5f27efa3bdcbd5040706c1d52c8c6f3ac86950c16dcfc2ad9e65b3a02ae"},"schema_version":"1.0"},"canonical_sha256":"8af2c82474d592845d9567a81cb8d2af0d091657a60734b7e0a669b204b64fc3","source":{"kind":"arxiv","id":"1802.01133","version":4},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1802.01133","created_at":"2026-05-17T23:56:53Z"},{"alias_kind":"arxiv_version","alias_value":"1802.01133v4","created_at":"2026-05-17T23:56:53Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1802.01133","created_at":"2026-05-17T23:56:53Z"},{"alias_kind":"pith_short_12","alias_value":"RLZMQJDU2WJI","created_at":"2026-05-18T12:32:50Z"},{"alias_kind":"pith_short_16","alias_value":"RLZMQJDU2WJIIXMV","created_at":"2026-05-18T12:32:50Z"},{"alias_kind":"pith_short_8","alias_value":"RLZMQJDU","created_at":"2026-05-18T12:32:50Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:RLZMQJDU2WJIIXMVM6UBZOGSV4","target":"record","payload":{"canonical_record":{"source":{"id":"1802.01133","kind":"arxiv","version":4},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2018-02-04T14:35:28Z","cross_cats_sorted":["math.IT"],"title_canon_sha256":"b2a0fa410f0af7ddbb9bb91243ae4db1fdc09015954f012d2c1593923da2c80d","abstract_canon_sha256":"0f3fc5f27efa3bdcbd5040706c1d52c8c6f3ac86950c16dcfc2ad9e65b3a02ae"},"schema_version":"1.0"},"canonical_sha256":"8af2c82474d592845d9567a81cb8d2af0d091657a60734b7e0a669b204b64fc3","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-17T23:56:53.613033Z","signature_b64":"sBt+wvpZ3yaTwIGcp8TDKVFJMCfGX7CnZQOWMRbWnAmc9moG+HxWTrJkBZuCeDNaZfx5673lyaF/tZkklWvYCQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"8af2c82474d592845d9567a81cb8d2af0d091657a60734b7e0a669b204b64fc3","last_reissued_at":"2026-05-17T23:56:53.612383Z","signature_status":"signed_v1","first_computed_at":"2026-05-17T23:56:53.612383Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1802.01133","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":"2026-05-17T23:56:53Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"GGXTar62Fs0HxNk1L8aHNeEL0aHgdWQqjmZ8GDT0DlRnFAoWXahmuMOhwyN86AmmHj+td6FiK6VGmv9zUO88AQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-30T05:20:35.496350Z"},"content_sha256":"96b808952e445c4f627cdb9e59349214a5f6d0fd5d26f1f350f69e1a1b57837b","schema_version":"1.0","event_id":"sha256:96b808952e445c4f627cdb9e59349214a5f6d0fd5d26f1f350f69e1a1b57837b"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:RLZMQJDU2WJIIXMVM6UBZOGSV4","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Repeat-Accumulate Signal Codes","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["math.IT"],"primary_cat":"cs.IT","authors_text":"Koji Ishibashi, Manato Takai","submitted_at":"2018-02-04T14:35:28Z","abstract_excerpt":"State-constrained signal codes directly encode modulation signals using signal processing filters, the coefficients of which are constrained over the rings of formal power series. Although the performance of signal codes is defined by these signal filters, optimal filters must be found by brute-force search in terms of symbol error rate because the asymptotic behavior with different filters has not been investigated. Moreover, computational complexity of the conventional BCJR used in the decoder increases exponentially as the number of output constellations increase. We hence propose a new cla"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1802.01133","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":"2026-05-17T23:56:53Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"idFQhto+lcZnnaa/aG14VtJPSpM+NmkdeSKwgLRQlMxo2ZscouoG0+x02VAKsieRQAqZjSKUZHlciR1Rf1HACw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-30T05:20:35.497010Z"},"content_sha256":"82327d9ee92e9834e02fa6903ae57d41c2c948ba2582ac5190b531c5aaa17831","schema_version":"1.0","event_id":"sha256:82327d9ee92e9834e02fa6903ae57d41c2c948ba2582ac5190b531c5aaa17831"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/RLZMQJDU2WJIIXMVM6UBZOGSV4/bundle.json","state_url":"https://pith.science/pith/RLZMQJDU2WJIIXMVM6UBZOGSV4/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/RLZMQJDU2WJIIXMVM6UBZOGSV4/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":"2026-05-30T05:20:35Z","links":{"resolver":"https://pith.science/pith/RLZMQJDU2WJIIXMVM6UBZOGSV4","bundle":"https://pith.science/pith/RLZMQJDU2WJIIXMVM6UBZOGSV4/bundle.json","state":"https://pith.science/pith/RLZMQJDU2WJIIXMVM6UBZOGSV4/state.json","well_known_bundle":"https://pith.science/.well-known/pith/RLZMQJDU2WJIIXMVM6UBZOGSV4/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:RLZMQJDU2WJIIXMVM6UBZOGSV4","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":"0f3fc5f27efa3bdcbd5040706c1d52c8c6f3ac86950c16dcfc2ad9e65b3a02ae","cross_cats_sorted":["math.IT"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2018-02-04T14:35:28Z","title_canon_sha256":"b2a0fa410f0af7ddbb9bb91243ae4db1fdc09015954f012d2c1593923da2c80d"},"schema_version":"1.0","source":{"id":"1802.01133","kind":"arxiv","version":4}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1802.01133","created_at":"2026-05-17T23:56:53Z"},{"alias_kind":"arxiv_version","alias_value":"1802.01133v4","created_at":"2026-05-17T23:56:53Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1802.01133","created_at":"2026-05-17T23:56:53Z"},{"alias_kind":"pith_short_12","alias_value":"RLZMQJDU2WJI","created_at":"2026-05-18T12:32:50Z"},{"alias_kind":"pith_short_16","alias_value":"RLZMQJDU2WJIIXMV","created_at":"2026-05-18T12:32:50Z"},{"alias_kind":"pith_short_8","alias_value":"RLZMQJDU","created_at":"2026-05-18T12:32:50Z"}],"graph_snapshots":[{"event_id":"sha256:82327d9ee92e9834e02fa6903ae57d41c2c948ba2582ac5190b531c5aaa17831","target":"graph","created_at":"2026-05-17T23:56:53Z","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":"State-constrained signal codes directly encode modulation signals using signal processing filters, the coefficients of which are constrained over the rings of formal power series. Although the performance of signal codes is defined by these signal filters, optimal filters must be found by brute-force search in terms of symbol error rate because the asymptotic behavior with different filters has not been investigated. Moreover, computational complexity of the conventional BCJR used in the decoder increases exponentially as the number of output constellations increase. We hence propose a new cla","authors_text":"Koji Ishibashi, Manato Takai","cross_cats":["math.IT"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2018-02-04T14:35:28Z","title":"Repeat-Accumulate Signal Codes"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1802.01133","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":"sha256:96b808952e445c4f627cdb9e59349214a5f6d0fd5d26f1f350f69e1a1b57837b","target":"record","created_at":"2026-05-17T23:56:53Z","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":"0f3fc5f27efa3bdcbd5040706c1d52c8c6f3ac86950c16dcfc2ad9e65b3a02ae","cross_cats_sorted":["math.IT"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2018-02-04T14:35:28Z","title_canon_sha256":"b2a0fa410f0af7ddbb9bb91243ae4db1fdc09015954f012d2c1593923da2c80d"},"schema_version":"1.0","source":{"id":"1802.01133","kind":"arxiv","version":4}},"canonical_sha256":"8af2c82474d592845d9567a81cb8d2af0d091657a60734b7e0a669b204b64fc3","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"8af2c82474d592845d9567a81cb8d2af0d091657a60734b7e0a669b204b64fc3","first_computed_at":"2026-05-17T23:56:53.612383Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-17T23:56:53.612383Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"sBt+wvpZ3yaTwIGcp8TDKVFJMCfGX7CnZQOWMRbWnAmc9moG+HxWTrJkBZuCeDNaZfx5673lyaF/tZkklWvYCQ==","signature_status":"signed_v1","signed_at":"2026-05-17T23:56:53.613033Z","signed_message":"canonical_sha256_bytes"},"source_id":"1802.01133","source_kind":"arxiv","source_version":4}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:96b808952e445c4f627cdb9e59349214a5f6d0fd5d26f1f350f69e1a1b57837b","sha256:82327d9ee92e9834e02fa6903ae57d41c2c948ba2582ac5190b531c5aaa17831"],"state_sha256":"9f49e616a45d399341bb4361c08544289323210a6619983a5d11dc438d8c6aa0"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"dWe58a3OTkqF65aDb+kS6GCeBFYZUyGnJS1O4hNZYU4aJ2DRP2i77IGn7GAWy2i1MMlpxwsw9NcmuJotbuo3AA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-30T05:20:35.500412Z","bundle_sha256":"0e485e030a352e052a3db63fa7c49981e63893f7aee911496ecd7ad919ba92b2"}}