{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2015:ALHYWCUMMES23O52TOV3XVKDQB","short_pith_number":"pith:ALHYWCUM","canonical_record":{"source":{"id":"1510.06800","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2015-10-23T01:42:04Z","cross_cats_sorted":["math.IT"],"title_canon_sha256":"8fa68e1427962285eb11dc4dcf8b62a49f00b694ff8c331d555d5ec01b71dbdb","abstract_canon_sha256":"caf976c0c6fb83f7159f2e2c5d38b1da65312ae1f459a298c0248b55cc512083"},"schema_version":"1.0"},"canonical_sha256":"02cf8b0a8c6125adbbba9babbbd5438065f5798d44f71e10b7eb6fb70a85a152","source":{"kind":"arxiv","id":"1510.06800","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1510.06800","created_at":"2026-05-18T01:25:54Z"},{"alias_kind":"arxiv_version","alias_value":"1510.06800v2","created_at":"2026-05-18T01:25:54Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1510.06800","created_at":"2026-05-18T01:25:54Z"},{"alias_kind":"pith_short_12","alias_value":"ALHYWCUMMES2","created_at":"2026-05-18T12:29:10Z"},{"alias_kind":"pith_short_16","alias_value":"ALHYWCUMMES23O52","created_at":"2026-05-18T12:29:10Z"},{"alias_kind":"pith_short_8","alias_value":"ALHYWCUM","created_at":"2026-05-18T12:29:10Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2015:ALHYWCUMMES23O52TOV3XVKDQB","target":"record","payload":{"canonical_record":{"source":{"id":"1510.06800","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2015-10-23T01:42:04Z","cross_cats_sorted":["math.IT"],"title_canon_sha256":"8fa68e1427962285eb11dc4dcf8b62a49f00b694ff8c331d555d5ec01b71dbdb","abstract_canon_sha256":"caf976c0c6fb83f7159f2e2c5d38b1da65312ae1f459a298c0248b55cc512083"},"schema_version":"1.0"},"canonical_sha256":"02cf8b0a8c6125adbbba9babbbd5438065f5798d44f71e10b7eb6fb70a85a152","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:25:54.806458Z","signature_b64":"qQjHIbYVTfot8TSTiHElaTo+RRogvEmSJfAgkq3dQaOqp01Rt4vYOQCY4SljlyJ6WkBU2aIk3iQOv++qtl59DQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"02cf8b0a8c6125adbbba9babbbd5438065f5798d44f71e10b7eb6fb70a85a152","last_reissued_at":"2026-05-18T01:25:54.805831Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:25:54.805831Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1510.06800","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":"2026-05-18T01:25:54Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"7IsgaXpyjWarHnkVefOfXHsb5lAiCHXXYt4B76q9XPIUK3Xa2aIpJTM/HFsRZsx7xQM1ptL4U29lIlPbmqMkAg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-27T14:45:28.846078Z"},"content_sha256":"eceb015ebcfd267597dc9f15207af2e4c3baed1e07aaf47969d28d45c0fcf25a","schema_version":"1.0","event_id":"sha256:eceb015ebcfd267597dc9f15207af2e4c3baed1e07aaf47969d28d45c0fcf25a"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2015:ALHYWCUMMES23O52TOV3XVKDQB","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Priori-Information Aided Iterative Hard Threshold: A Low-Complexity High-Accuracy Compressive Sensing Based Channel Estimation for TDS-OFDM","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["math.IT"],"primary_cat":"cs.IT","authors_text":"Chao Zhang, Sheng Chen, Zhaocheng Wang, Zhen Gao","submitted_at":"2015-10-23T01:42:04Z","abstract_excerpt":"This paper develops a low-complexity channel estimation (CE) scheme based on compressive sensing (CS) for time-domain synchronous (TDS) orthogonal frequency-division multiplexing (OFDM) to overcome the performance loss under doubly selective fading channels. Specifically, an overlap-add method of the time-domain training sequence is first proposed to obtain the coarse estimates of the channel length, path delays and path gains of the wireless channel, by exploiting the channel's temporal correlation to improve the robustness of the coarse CE under the severe fading channel with long delay spre"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1510.06800","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":"2026-05-18T01:25:54Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"VrMuHfxgHxDrLCTShKG4846ihEMo+fDQA0bofkckJkfqUqjF+eqbjs/g768YXao3kHWg2IXm2+8Eb2sGcEECDg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-27T14:45:28.846493Z"},"content_sha256":"df7cdd67ea1e8a9bd5edd0871a9b6aa4ae20ccd908271d4b89cd2b70f8bcef7b","schema_version":"1.0","event_id":"sha256:df7cdd67ea1e8a9bd5edd0871a9b6aa4ae20ccd908271d4b89cd2b70f8bcef7b"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/ALHYWCUMMES23O52TOV3XVKDQB/bundle.json","state_url":"https://pith.science/pith/ALHYWCUMMES23O52TOV3XVKDQB/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/ALHYWCUMMES23O52TOV3XVKDQB/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":"2026-05-27T14:45:28Z","links":{"resolver":"https://pith.science/pith/ALHYWCUMMES23O52TOV3XVKDQB","bundle":"https://pith.science/pith/ALHYWCUMMES23O52TOV3XVKDQB/bundle.json","state":"https://pith.science/pith/ALHYWCUMMES23O52TOV3XVKDQB/state.json","well_known_bundle":"https://pith.science/.well-known/pith/ALHYWCUMMES23O52TOV3XVKDQB/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2015:ALHYWCUMMES23O52TOV3XVKDQB","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":"caf976c0c6fb83f7159f2e2c5d38b1da65312ae1f459a298c0248b55cc512083","cross_cats_sorted":["math.IT"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2015-10-23T01:42:04Z","title_canon_sha256":"8fa68e1427962285eb11dc4dcf8b62a49f00b694ff8c331d555d5ec01b71dbdb"},"schema_version":"1.0","source":{"id":"1510.06800","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1510.06800","created_at":"2026-05-18T01:25:54Z"},{"alias_kind":"arxiv_version","alias_value":"1510.06800v2","created_at":"2026-05-18T01:25:54Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1510.06800","created_at":"2026-05-18T01:25:54Z"},{"alias_kind":"pith_short_12","alias_value":"ALHYWCUMMES2","created_at":"2026-05-18T12:29:10Z"},{"alias_kind":"pith_short_16","alias_value":"ALHYWCUMMES23O52","created_at":"2026-05-18T12:29:10Z"},{"alias_kind":"pith_short_8","alias_value":"ALHYWCUM","created_at":"2026-05-18T12:29:10Z"}],"graph_snapshots":[{"event_id":"sha256:df7cdd67ea1e8a9bd5edd0871a9b6aa4ae20ccd908271d4b89cd2b70f8bcef7b","target":"graph","created_at":"2026-05-18T01:25:54Z","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":"This paper develops a low-complexity channel estimation (CE) scheme based on compressive sensing (CS) for time-domain synchronous (TDS) orthogonal frequency-division multiplexing (OFDM) to overcome the performance loss under doubly selective fading channels. Specifically, an overlap-add method of the time-domain training sequence is first proposed to obtain the coarse estimates of the channel length, path delays and path gains of the wireless channel, by exploiting the channel's temporal correlation to improve the robustness of the coarse CE under the severe fading channel with long delay spre","authors_text":"Chao Zhang, Sheng Chen, Zhaocheng Wang, Zhen Gao","cross_cats":["math.IT"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2015-10-23T01:42:04Z","title":"Priori-Information Aided Iterative Hard Threshold: A Low-Complexity High-Accuracy Compressive Sensing Based Channel Estimation for TDS-OFDM"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1510.06800","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:eceb015ebcfd267597dc9f15207af2e4c3baed1e07aaf47969d28d45c0fcf25a","target":"record","created_at":"2026-05-18T01:25:54Z","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":"caf976c0c6fb83f7159f2e2c5d38b1da65312ae1f459a298c0248b55cc512083","cross_cats_sorted":["math.IT"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2015-10-23T01:42:04Z","title_canon_sha256":"8fa68e1427962285eb11dc4dcf8b62a49f00b694ff8c331d555d5ec01b71dbdb"},"schema_version":"1.0","source":{"id":"1510.06800","kind":"arxiv","version":2}},"canonical_sha256":"02cf8b0a8c6125adbbba9babbbd5438065f5798d44f71e10b7eb6fb70a85a152","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"02cf8b0a8c6125adbbba9babbbd5438065f5798d44f71e10b7eb6fb70a85a152","first_computed_at":"2026-05-18T01:25:54.805831Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:25:54.805831Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"qQjHIbYVTfot8TSTiHElaTo+RRogvEmSJfAgkq3dQaOqp01Rt4vYOQCY4SljlyJ6WkBU2aIk3iQOv++qtl59DQ==","signature_status":"signed_v1","signed_at":"2026-05-18T01:25:54.806458Z","signed_message":"canonical_sha256_bytes"},"source_id":"1510.06800","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:eceb015ebcfd267597dc9f15207af2e4c3baed1e07aaf47969d28d45c0fcf25a","sha256:df7cdd67ea1e8a9bd5edd0871a9b6aa4ae20ccd908271d4b89cd2b70f8bcef7b"],"state_sha256":"cc0d2cd7bbf344f2f01301f0d5cf500fceaa66954bc0e1c72d855404e8c19c89"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"zt7Zgw0rpdvHcaoTzb6+VGNw6XXfUMvwIDYZY7yPkOTzslGnGzZ9ukesz+yzw751hAuBQxmIU731QiQctu2JBA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-27T14:45:28.849981Z","bundle_sha256":"84370ba46356ee8d4ae3aa5d62c2df1b2552d590c8cde71c809f06ba69c11a05"}}