{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:CRDMK6NDZHD6345BIBWCQUEV2Y","short_pith_number":"pith:CRDMK6ND","canonical_record":{"source":{"id":"1803.02950","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SP","submitted_at":"2018-03-08T03:11:47Z","cross_cats_sorted":[],"title_canon_sha256":"c35accf8449aa717ff1a8f5e8dbe7b259a3353f095a1cbfd586d500bf76ba6e2","abstract_canon_sha256":"b768c0dac7b2c0e21218ca1f5df7b2d85ad4cb9563779648530ffc1ad1b66f0b"},"schema_version":"1.0"},"canonical_sha256":"1446c579a3c9c7edf3a1406c285095d61d607a79bfd5af100172ed93ce0b4e69","source":{"kind":"arxiv","id":"1803.02950","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1803.02950","created_at":"2026-05-18T00:21:44Z"},{"alias_kind":"arxiv_version","alias_value":"1803.02950v1","created_at":"2026-05-18T00:21:44Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1803.02950","created_at":"2026-05-18T00:21:44Z"},{"alias_kind":"pith_short_12","alias_value":"CRDMK6NDZHD6","created_at":"2026-05-18T12:32:16Z"},{"alias_kind":"pith_short_16","alias_value":"CRDMK6NDZHD6345B","created_at":"2026-05-18T12:32:16Z"},{"alias_kind":"pith_short_8","alias_value":"CRDMK6ND","created_at":"2026-05-18T12:32:16Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:CRDMK6NDZHD6345BIBWCQUEV2Y","target":"record","payload":{"canonical_record":{"source":{"id":"1803.02950","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SP","submitted_at":"2018-03-08T03:11:47Z","cross_cats_sorted":[],"title_canon_sha256":"c35accf8449aa717ff1a8f5e8dbe7b259a3353f095a1cbfd586d500bf76ba6e2","abstract_canon_sha256":"b768c0dac7b2c0e21218ca1f5df7b2d85ad4cb9563779648530ffc1ad1b66f0b"},"schema_version":"1.0"},"canonical_sha256":"1446c579a3c9c7edf3a1406c285095d61d607a79bfd5af100172ed93ce0b4e69","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:21:44.890729Z","signature_b64":"AYrBrDPIDY0YHRB+rc7Wft6WWkTQMCW3T/wiFK5DeT2nbkcXjc9qmrkM8qDV9XMN137AQaxOtpB0ed8tW57kAw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"1446c579a3c9c7edf3a1406c285095d61d607a79bfd5af100172ed93ce0b4e69","last_reissued_at":"2026-05-18T00:21:44.890240Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:21:44.890240Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1803.02950","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":"2026-05-18T00:21:44Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"gn+DYfoKo/oJrg7BLMBZesutTmaf5V88CmvPpbatz3xbhrfz8e5B4IyYGBVnbP7xaVyjBVbHJE7JH+qJMGeJBg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-07T20:18:57.040367Z"},"content_sha256":"9eeb04e7d325142e11a1838d35bee81a142cab73516ded7e716c72b458771b08","schema_version":"1.0","event_id":"sha256:9eeb04e7d325142e11a1838d35bee81a142cab73516ded7e716c72b458771b08"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:CRDMK6NDZHD6345BIBWCQUEV2Y","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"M-ary Orthogonal Chirp Modulation for Coherent and Non-coherent Underwater Acoustic Communications","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"eess.SP","authors_text":"Dimitris A. Pados, Song-Wen Huang","submitted_at":"2018-03-08T03:11:47Z","abstract_excerpt":"We propose an orthogonal chirp waveform design for underwater acoustic (UW-A) communications and analyze the cross-correlation characteristics of orthogonal chirp waveforms in coherent and non-coherent detections. We consider information symbols are carried over proposed M-ary orthogonal chirp waveforms for UW-A transmissions. Moreover, we develop a coherent and an optimal non-coherent receivers based on proposed chirp waveforms. Explicit derivations include closed-form expressions for cross-correlation coefficients, and theoretical bit-error-rate (BER) of coherent and non-coherent receivers. "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1803.02950","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":"2026-05-18T00:21:44Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"ocHub8IgUlcO8OU+L8wFUp3f0cRG/pT+tQm1CfdL58aEwKNyU1mWuT06W2TleZj1sZr/ehpKpTsGTqsghxZxAA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-07T20:18:57.041046Z"},"content_sha256":"5607ac954c2aad5f2e9bece65d437364c3606e6699bfb23135af420994fdb6cb","schema_version":"1.0","event_id":"sha256:5607ac954c2aad5f2e9bece65d437364c3606e6699bfb23135af420994fdb6cb"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/CRDMK6NDZHD6345BIBWCQUEV2Y/bundle.json","state_url":"https://pith.science/pith/CRDMK6NDZHD6345BIBWCQUEV2Y/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/CRDMK6NDZHD6345BIBWCQUEV2Y/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":"2026-06-07T20:18:57Z","links":{"resolver":"https://pith.science/pith/CRDMK6NDZHD6345BIBWCQUEV2Y","bundle":"https://pith.science/pith/CRDMK6NDZHD6345BIBWCQUEV2Y/bundle.json","state":"https://pith.science/pith/CRDMK6NDZHD6345BIBWCQUEV2Y/state.json","well_known_bundle":"https://pith.science/.well-known/pith/CRDMK6NDZHD6345BIBWCQUEV2Y/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:CRDMK6NDZHD6345BIBWCQUEV2Y","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":"b768c0dac7b2c0e21218ca1f5df7b2d85ad4cb9563779648530ffc1ad1b66f0b","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SP","submitted_at":"2018-03-08T03:11:47Z","title_canon_sha256":"c35accf8449aa717ff1a8f5e8dbe7b259a3353f095a1cbfd586d500bf76ba6e2"},"schema_version":"1.0","source":{"id":"1803.02950","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1803.02950","created_at":"2026-05-18T00:21:44Z"},{"alias_kind":"arxiv_version","alias_value":"1803.02950v1","created_at":"2026-05-18T00:21:44Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1803.02950","created_at":"2026-05-18T00:21:44Z"},{"alias_kind":"pith_short_12","alias_value":"CRDMK6NDZHD6","created_at":"2026-05-18T12:32:16Z"},{"alias_kind":"pith_short_16","alias_value":"CRDMK6NDZHD6345B","created_at":"2026-05-18T12:32:16Z"},{"alias_kind":"pith_short_8","alias_value":"CRDMK6ND","created_at":"2026-05-18T12:32:16Z"}],"graph_snapshots":[{"event_id":"sha256:5607ac954c2aad5f2e9bece65d437364c3606e6699bfb23135af420994fdb6cb","target":"graph","created_at":"2026-05-18T00:21:44Z","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":"We propose an orthogonal chirp waveform design for underwater acoustic (UW-A) communications and analyze the cross-correlation characteristics of orthogonal chirp waveforms in coherent and non-coherent detections. We consider information symbols are carried over proposed M-ary orthogonal chirp waveforms for UW-A transmissions. Moreover, we develop a coherent and an optimal non-coherent receivers based on proposed chirp waveforms. Explicit derivations include closed-form expressions for cross-correlation coefficients, and theoretical bit-error-rate (BER) of coherent and non-coherent receivers. ","authors_text":"Dimitris A. Pados, Song-Wen Huang","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SP","submitted_at":"2018-03-08T03:11:47Z","title":"M-ary Orthogonal Chirp Modulation for Coherent and Non-coherent Underwater Acoustic Communications"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1803.02950","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":"sha256:9eeb04e7d325142e11a1838d35bee81a142cab73516ded7e716c72b458771b08","target":"record","created_at":"2026-05-18T00:21:44Z","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":"b768c0dac7b2c0e21218ca1f5df7b2d85ad4cb9563779648530ffc1ad1b66f0b","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SP","submitted_at":"2018-03-08T03:11:47Z","title_canon_sha256":"c35accf8449aa717ff1a8f5e8dbe7b259a3353f095a1cbfd586d500bf76ba6e2"},"schema_version":"1.0","source":{"id":"1803.02950","kind":"arxiv","version":1}},"canonical_sha256":"1446c579a3c9c7edf3a1406c285095d61d607a79bfd5af100172ed93ce0b4e69","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"1446c579a3c9c7edf3a1406c285095d61d607a79bfd5af100172ed93ce0b4e69","first_computed_at":"2026-05-18T00:21:44.890240Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:21:44.890240Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"AYrBrDPIDY0YHRB+rc7Wft6WWkTQMCW3T/wiFK5DeT2nbkcXjc9qmrkM8qDV9XMN137AQaxOtpB0ed8tW57kAw==","signature_status":"signed_v1","signed_at":"2026-05-18T00:21:44.890729Z","signed_message":"canonical_sha256_bytes"},"source_id":"1803.02950","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:9eeb04e7d325142e11a1838d35bee81a142cab73516ded7e716c72b458771b08","sha256:5607ac954c2aad5f2e9bece65d437364c3606e6699bfb23135af420994fdb6cb"],"state_sha256":"b3ca936883e84806cc9fe0f87c9fca5decb60a0a3e05f45b53c2c6836f4800e8"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"xS82dR9s51oRIIB78INnByHn4aXEEk8wv7zOrWKXMPpyLpB67yaeTtdoxEH1jdraNcLa0a/lKssCotdlUWjxCA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-07T20:18:57.044728Z","bundle_sha256":"03534b2ca5183f19fea25d20904029f6a7988a0629c9a6383d8be3f6e8829293"}}