{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2020:URNQKGVUKRHVHGNHAXI5J3TA3W","short_pith_number":"pith:URNQKGVU","canonical_record":{"source":{"id":"2009.10109","kind":"arxiv","version":4},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"eess.SP","submitted_at":"2020-09-21T18:12:56Z","cross_cats_sorted":[],"title_canon_sha256":"860a76f864a9598fb49121fcc8784d9b7893f5785cd9f91c00f7ec7e7641f979","abstract_canon_sha256":"4c7b03ca83acec826ea8969df323b48a22a43a6cdaf6fbbcf7b62f1abf7c60e6"},"schema_version":"1.0"},"canonical_sha256":"a45b051ab4544f5399a705d1d4ee60ddbce8fa4531b87fb4ca1e8e21dbdbbdfe","source":{"kind":"arxiv","id":"2009.10109","version":4},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2009.10109","created_at":"2026-07-05T02:07:30Z"},{"alias_kind":"arxiv_version","alias_value":"2009.10109v4","created_at":"2026-07-05T02:07:30Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2009.10109","created_at":"2026-07-05T02:07:30Z"},{"alias_kind":"pith_short_12","alias_value":"URNQKGVUKRHV","created_at":"2026-07-05T02:07:30Z"},{"alias_kind":"pith_short_16","alias_value":"URNQKGVUKRHVHGNH","created_at":"2026-07-05T02:07:30Z"},{"alias_kind":"pith_short_8","alias_value":"URNQKGVU","created_at":"2026-07-05T02:07:30Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2020:URNQKGVUKRHVHGNHAXI5J3TA3W","target":"record","payload":{"canonical_record":{"source":{"id":"2009.10109","kind":"arxiv","version":4},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"eess.SP","submitted_at":"2020-09-21T18:12:56Z","cross_cats_sorted":[],"title_canon_sha256":"860a76f864a9598fb49121fcc8784d9b7893f5785cd9f91c00f7ec7e7641f979","abstract_canon_sha256":"4c7b03ca83acec826ea8969df323b48a22a43a6cdaf6fbbcf7b62f1abf7c60e6"},"schema_version":"1.0"},"canonical_sha256":"a45b051ab4544f5399a705d1d4ee60ddbce8fa4531b87fb4ca1e8e21dbdbbdfe","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T02:07:30.938786Z","signature_b64":"DmnSDHsMPfqZBa3vLM4oLRaEhwyg0fsnudtuth0sfAQlDCkNCWK0hwPYhowBoDYlL5gIFIe2q0/r0K4z4cD/AA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"a45b051ab4544f5399a705d1d4ee60ddbce8fa4531b87fb4ca1e8e21dbdbbdfe","last_reissued_at":"2026-07-05T02:07:30.938301Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T02:07:30.938301Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2009.10109","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":"2026-07-05T02:07:30Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Mpz45WHb7aiPFKFl99GCGt7poA8Pv+7qjWG1NVguKcFJ2ZZFVUBJWH6svEswU5zsAkn7AqsnjRCtZBgaNNrbCA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-22T04:06:52.209926Z"},"content_sha256":"437e6d12b3d2f823a4dcb22d909e9fb43510e9caca3d315f45cbba180535f565","schema_version":"1.0","event_id":"sha256:437e6d12b3d2f823a4dcb22d909e9fb43510e9caca3d315f45cbba180535f565"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2020:URNQKGVUKRHVHGNHAXI5J3TA3W","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Design and Implementation of Low Complexity Reconfigurable Filtered-OFDM based LDACS","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":[],"primary_cat":"eess.SP","authors_text":"A. Ambede, A. P. Vinod, A. S. Madhukumar, N. Agrawal, S. J. Darak","submitted_at":"2020-09-21T18:12:56Z","abstract_excerpt":"L-band Digital Aeronautical Communication System (LDACS) aims to exploit vacant spectrum in L-band via spectrum sharing, and orthogonal frequency division multiplexing (OFDM) is the currently accepted LDACS waveform. Recently, various works dealing with improving the spectrum utilization of LDACS via filtering/windowing are being explored. In this direction, we propose an improved and low complexity reconfigurable filtered OFDM (LRef-OFDM) based LDACS using novel interpolation and masking based multi-stage digital filter. The proposed filter is designed to meet the stringent non-uniform spectr"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2009.10109","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2009.10109/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":"2026-07-05T02:07:30Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"8l1JjMrV2MFmbTSatSK7ttpph8zd2i/9kpgl9yhDYPjG2OHrmEC5dw67PJ9qp+UOOu4Ks/v2Q39P68aI1eGvDw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-22T04:06:52.210446Z"},"content_sha256":"74aae3af578118721d38f5df7e65f9c7ff65ae87c73c252edce430b564ce2208","schema_version":"1.0","event_id":"sha256:74aae3af578118721d38f5df7e65f9c7ff65ae87c73c252edce430b564ce2208"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/URNQKGVUKRHVHGNHAXI5J3TA3W/bundle.json","state_url":"https://pith.science/pith/URNQKGVUKRHVHGNHAXI5J3TA3W/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/URNQKGVUKRHVHGNHAXI5J3TA3W/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":"2026-08-22T04:06:52Z","links":{"resolver":"https://pith.science/pith/URNQKGVUKRHVHGNHAXI5J3TA3W","bundle":"https://pith.science/pith/URNQKGVUKRHVHGNHAXI5J3TA3W/bundle.json","state":"https://pith.science/pith/URNQKGVUKRHVHGNHAXI5J3TA3W/state.json","well_known_bundle":"https://pith.science/.well-known/pith/URNQKGVUKRHVHGNHAXI5J3TA3W/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2020:URNQKGVUKRHVHGNHAXI5J3TA3W","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":"4c7b03ca83acec826ea8969df323b48a22a43a6cdaf6fbbcf7b62f1abf7c60e6","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"eess.SP","submitted_at":"2020-09-21T18:12:56Z","title_canon_sha256":"860a76f864a9598fb49121fcc8784d9b7893f5785cd9f91c00f7ec7e7641f979"},"schema_version":"1.0","source":{"id":"2009.10109","kind":"arxiv","version":4}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2009.10109","created_at":"2026-07-05T02:07:30Z"},{"alias_kind":"arxiv_version","alias_value":"2009.10109v4","created_at":"2026-07-05T02:07:30Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2009.10109","created_at":"2026-07-05T02:07:30Z"},{"alias_kind":"pith_short_12","alias_value":"URNQKGVUKRHV","created_at":"2026-07-05T02:07:30Z"},{"alias_kind":"pith_short_16","alias_value":"URNQKGVUKRHVHGNH","created_at":"2026-07-05T02:07:30Z"},{"alias_kind":"pith_short_8","alias_value":"URNQKGVU","created_at":"2026-07-05T02:07:30Z"}],"graph_snapshots":[{"event_id":"sha256:74aae3af578118721d38f5df7e65f9c7ff65ae87c73c252edce430b564ce2208","target":"graph","created_at":"2026-07-05T02:07:30Z","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/2009.10109/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"L-band Digital Aeronautical Communication System (LDACS) aims to exploit vacant spectrum in L-band via spectrum sharing, and orthogonal frequency division multiplexing (OFDM) is the currently accepted LDACS waveform. Recently, various works dealing with improving the spectrum utilization of LDACS via filtering/windowing are being explored. In this direction, we propose an improved and low complexity reconfigurable filtered OFDM (LRef-OFDM) based LDACS using novel interpolation and masking based multi-stage digital filter. The proposed filter is designed to meet the stringent non-uniform spectr","authors_text":"A. Ambede, A. P. Vinod, A. S. Madhukumar, N. Agrawal, S. J. Darak","cross_cats":[],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"eess.SP","submitted_at":"2020-09-21T18:12:56Z","title":"Design and Implementation of Low Complexity Reconfigurable Filtered-OFDM based LDACS"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2009.10109","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":"sha256:437e6d12b3d2f823a4dcb22d909e9fb43510e9caca3d315f45cbba180535f565","target":"record","created_at":"2026-07-05T02:07:30Z","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":"4c7b03ca83acec826ea8969df323b48a22a43a6cdaf6fbbcf7b62f1abf7c60e6","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"eess.SP","submitted_at":"2020-09-21T18:12:56Z","title_canon_sha256":"860a76f864a9598fb49121fcc8784d9b7893f5785cd9f91c00f7ec7e7641f979"},"schema_version":"1.0","source":{"id":"2009.10109","kind":"arxiv","version":4}},"canonical_sha256":"a45b051ab4544f5399a705d1d4ee60ddbce8fa4531b87fb4ca1e8e21dbdbbdfe","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"a45b051ab4544f5399a705d1d4ee60ddbce8fa4531b87fb4ca1e8e21dbdbbdfe","first_computed_at":"2026-07-05T02:07:30.938301Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T02:07:30.938301Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"DmnSDHsMPfqZBa3vLM4oLRaEhwyg0fsnudtuth0sfAQlDCkNCWK0hwPYhowBoDYlL5gIFIe2q0/r0K4z4cD/AA==","signature_status":"signed_v1","signed_at":"2026-07-05T02:07:30.938786Z","signed_message":"canonical_sha256_bytes"},"source_id":"2009.10109","source_kind":"arxiv","source_version":4}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:437e6d12b3d2f823a4dcb22d909e9fb43510e9caca3d315f45cbba180535f565","sha256:74aae3af578118721d38f5df7e65f9c7ff65ae87c73c252edce430b564ce2208"],"state_sha256":"65f6f314a643bd5987c4c8e23aa7b4c388f91bbc94b1787bba38aa73bde1e90f"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"gd+mO4+nI6gl4wTqj6tzPBkScFOXn6cL5VgNbYlc64lk/HRK7Q+wDFitl96mcx86IFCBsWqVKMbY6f9NYhsoDw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-22T04:06:52.215154Z","bundle_sha256":"55e9aa9a66cb65cfa986890e0ed7f5f1f0db7432730c7d872df26605b9ca1247"}}