{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2025:NVGAYDBIHYG7ZDJO4ASYS7DXR4","short_pith_number":"pith:NVGAYDBI","canonical_record":{"source":{"id":"2502.04003","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SP","submitted_at":"2025-02-06T12:01:08Z","cross_cats_sorted":[],"title_canon_sha256":"092ab8b563f45dda29115991308c12574ecf71387bb9707df61a4dd47412b2cd","abstract_canon_sha256":"545fc0a651cd8c6682bea4158313afc845077fda581ea636bf0342784493c443"},"schema_version":"1.0"},"canonical_sha256":"6d4c0c0c283e0dfc8d2ee025897c778f32995aa75f9512fdaf6cd601a55f3211","source":{"kind":"arxiv","id":"2502.04003","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2502.04003","created_at":"2026-07-05T10:10:32Z"},{"alias_kind":"arxiv_version","alias_value":"2502.04003v1","created_at":"2026-07-05T10:10:32Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2502.04003","created_at":"2026-07-05T10:10:32Z"},{"alias_kind":"pith_short_12","alias_value":"NVGAYDBIHYG7","created_at":"2026-07-05T10:10:32Z"},{"alias_kind":"pith_short_16","alias_value":"NVGAYDBIHYG7ZDJO","created_at":"2026-07-05T10:10:32Z"},{"alias_kind":"pith_short_8","alias_value":"NVGAYDBI","created_at":"2026-07-05T10:10:32Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2025:NVGAYDBIHYG7ZDJO4ASYS7DXR4","target":"record","payload":{"canonical_record":{"source":{"id":"2502.04003","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SP","submitted_at":"2025-02-06T12:01:08Z","cross_cats_sorted":[],"title_canon_sha256":"092ab8b563f45dda29115991308c12574ecf71387bb9707df61a4dd47412b2cd","abstract_canon_sha256":"545fc0a651cd8c6682bea4158313afc845077fda581ea636bf0342784493c443"},"schema_version":"1.0"},"canonical_sha256":"6d4c0c0c283e0dfc8d2ee025897c778f32995aa75f9512fdaf6cd601a55f3211","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T10:10:32.696256Z","signature_b64":"q5b8JavFFA8Dt2n/J+bE0CRQYwU3KbPw6a9LHuIoAMruH6pWduMZmLR0SPZdPG2D1KxwrKQnft8cdtwQ6cxQBQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"6d4c0c0c283e0dfc8d2ee025897c778f32995aa75f9512fdaf6cd601a55f3211","last_reissued_at":"2026-07-05T10:10:32.695807Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T10:10:32.695807Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2502.04003","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":"2026-07-05T10:10:32Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"c8Mhl4xsiVFLUge1pYU/rc4mJFhsVb/4RiwwVI0ghPlGFCLUICyE6iv9Damvh3RM5ETkxpZo/1DdRhACdVmeBQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-05T15:18:11.276823Z"},"content_sha256":"8b49fdbc510b5b9c735415a790a3feb928487c9a914698408ad67b482188d66e","schema_version":"1.0","event_id":"sha256:8b49fdbc510b5b9c735415a790a3feb928487c9a914698408ad67b482188d66e"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2025:NVGAYDBIHYG7ZDJO4ASYS7DXR4","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Performance Analysis of BEM-based Channel Estimation for OTFS with Hardware Impairments","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"eess.SP","authors_text":"Haowei Wu, Huanyu Chen, Jinglan Ou, Qihao Peng, Qu Luo","submitted_at":"2025-02-06T12:01:08Z","abstract_excerpt":"This letter studies the low-complexity channel estimation for orthogonal time frequency space (OTFS) in the presence of hardware impairments. Firstly, to tackle the computational complexity of channel estimation, the basis expansion model (BEM) is utilized. Then, the mean square error (MSE) of the estimated channel is theoretically derived, revealing the effects of hardware impairments on channel estimation. Based on the estimated channel, the minimum mean square error (MMSE) detector is adopted to analyze the impacts of imperfect hardware on the bit error rate (BER). Finally, the numerical re"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2502.04003","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/2502.04003/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":"2026-07-05T10:10:32Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"MPLjWqCInJhFEo9OiZV+mRtDEU/czWrhDcVVtCjO0QpyNcKLkwWjIR8O/qKLCIPm5Z8luQXZsuMRTLyMSluSAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-05T15:18:11.277311Z"},"content_sha256":"07a4acbdc647434f964eac232f15ec279e825e58597660071b81abd3e209f6d5","schema_version":"1.0","event_id":"sha256:07a4acbdc647434f964eac232f15ec279e825e58597660071b81abd3e209f6d5"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/NVGAYDBIHYG7ZDJO4ASYS7DXR4/bundle.json","state_url":"https://pith.science/pith/NVGAYDBIHYG7ZDJO4ASYS7DXR4/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/NVGAYDBIHYG7ZDJO4ASYS7DXR4/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":"2026-08-05T15:18:11Z","links":{"resolver":"https://pith.science/pith/NVGAYDBIHYG7ZDJO4ASYS7DXR4","bundle":"https://pith.science/pith/NVGAYDBIHYG7ZDJO4ASYS7DXR4/bundle.json","state":"https://pith.science/pith/NVGAYDBIHYG7ZDJO4ASYS7DXR4/state.json","well_known_bundle":"https://pith.science/.well-known/pith/NVGAYDBIHYG7ZDJO4ASYS7DXR4/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2025:NVGAYDBIHYG7ZDJO4ASYS7DXR4","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":"545fc0a651cd8c6682bea4158313afc845077fda581ea636bf0342784493c443","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SP","submitted_at":"2025-02-06T12:01:08Z","title_canon_sha256":"092ab8b563f45dda29115991308c12574ecf71387bb9707df61a4dd47412b2cd"},"schema_version":"1.0","source":{"id":"2502.04003","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2502.04003","created_at":"2026-07-05T10:10:32Z"},{"alias_kind":"arxiv_version","alias_value":"2502.04003v1","created_at":"2026-07-05T10:10:32Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2502.04003","created_at":"2026-07-05T10:10:32Z"},{"alias_kind":"pith_short_12","alias_value":"NVGAYDBIHYG7","created_at":"2026-07-05T10:10:32Z"},{"alias_kind":"pith_short_16","alias_value":"NVGAYDBIHYG7ZDJO","created_at":"2026-07-05T10:10:32Z"},{"alias_kind":"pith_short_8","alias_value":"NVGAYDBI","created_at":"2026-07-05T10:10:32Z"}],"graph_snapshots":[{"event_id":"sha256:07a4acbdc647434f964eac232f15ec279e825e58597660071b81abd3e209f6d5","target":"graph","created_at":"2026-07-05T10:10:32Z","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/2502.04003/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"This letter studies the low-complexity channel estimation for orthogonal time frequency space (OTFS) in the presence of hardware impairments. Firstly, to tackle the computational complexity of channel estimation, the basis expansion model (BEM) is utilized. Then, the mean square error (MSE) of the estimated channel is theoretically derived, revealing the effects of hardware impairments on channel estimation. Based on the estimated channel, the minimum mean square error (MMSE) detector is adopted to analyze the impacts of imperfect hardware on the bit error rate (BER). Finally, the numerical re","authors_text":"Haowei Wu, Huanyu Chen, Jinglan Ou, Qihao Peng, Qu Luo","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SP","submitted_at":"2025-02-06T12:01:08Z","title":"Performance Analysis of BEM-based Channel Estimation for OTFS with Hardware Impairments"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2502.04003","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":"sha256:8b49fdbc510b5b9c735415a790a3feb928487c9a914698408ad67b482188d66e","target":"record","created_at":"2026-07-05T10:10:32Z","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":"545fc0a651cd8c6682bea4158313afc845077fda581ea636bf0342784493c443","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SP","submitted_at":"2025-02-06T12:01:08Z","title_canon_sha256":"092ab8b563f45dda29115991308c12574ecf71387bb9707df61a4dd47412b2cd"},"schema_version":"1.0","source":{"id":"2502.04003","kind":"arxiv","version":1}},"canonical_sha256":"6d4c0c0c283e0dfc8d2ee025897c778f32995aa75f9512fdaf6cd601a55f3211","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"6d4c0c0c283e0dfc8d2ee025897c778f32995aa75f9512fdaf6cd601a55f3211","first_computed_at":"2026-07-05T10:10:32.695807Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T10:10:32.695807Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"q5b8JavFFA8Dt2n/J+bE0CRQYwU3KbPw6a9LHuIoAMruH6pWduMZmLR0SPZdPG2D1KxwrKQnft8cdtwQ6cxQBQ==","signature_status":"signed_v1","signed_at":"2026-07-05T10:10:32.696256Z","signed_message":"canonical_sha256_bytes"},"source_id":"2502.04003","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:8b49fdbc510b5b9c735415a790a3feb928487c9a914698408ad67b482188d66e","sha256:07a4acbdc647434f964eac232f15ec279e825e58597660071b81abd3e209f6d5"],"state_sha256":"835fd16ec8f7318383db5cdcf5c27c0aabaf330ab4ca420146184843c84d21f8"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"GaSx2e8EPsNpHmoHs9OpCDAxJINpmWIGDq/qKTVEmb/RLnUMLcT+44XUk6hXd7xyjFCRHM5KIKjeaaWwIzY9BQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-05T15:18:11.280619Z","bundle_sha256":"6057b29a2270536f5207fff302445f1a06235735976d2cc7c3974209d9c5b112"}}