{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2026:VHAOF5ZVPNWKLM2UWJNWGRIE7H","short_pith_number":"pith:VHAOF5ZV","canonical_record":{"source":{"id":"2606.00263","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SP","submitted_at":"2026-05-29T18:49:40Z","cross_cats_sorted":["cs.LG"],"title_canon_sha256":"d8e9c94404f6277fe1963d6c97da08654375e6b9c072ebc46542abbe20292ca2","abstract_canon_sha256":"2beebaac40f824193c56d04445c941555da91bc9a5cedaa376f3c46ae49399c9"},"schema_version":"1.0"},"canonical_sha256":"a9c0e2f7357b6ca5b354b25b634504f9e61895f2f966f0b04e8ef012784ecb8d","source":{"kind":"arxiv","id":"2606.00263","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2606.00263","created_at":"2026-06-02T01:03:23Z"},{"alias_kind":"arxiv_version","alias_value":"2606.00263v1","created_at":"2026-06-02T01:03:23Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2606.00263","created_at":"2026-06-02T01:03:23Z"},{"alias_kind":"pith_short_12","alias_value":"VHAOF5ZVPNWK","created_at":"2026-06-02T01:03:23Z"},{"alias_kind":"pith_short_16","alias_value":"VHAOF5ZVPNWKLM2U","created_at":"2026-06-02T01:03:23Z"},{"alias_kind":"pith_short_8","alias_value":"VHAOF5ZV","created_at":"2026-06-02T01:03:23Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2026:VHAOF5ZVPNWKLM2UWJNWGRIE7H","target":"record","payload":{"canonical_record":{"source":{"id":"2606.00263","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SP","submitted_at":"2026-05-29T18:49:40Z","cross_cats_sorted":["cs.LG"],"title_canon_sha256":"d8e9c94404f6277fe1963d6c97da08654375e6b9c072ebc46542abbe20292ca2","abstract_canon_sha256":"2beebaac40f824193c56d04445c941555da91bc9a5cedaa376f3c46ae49399c9"},"schema_version":"1.0"},"canonical_sha256":"a9c0e2f7357b6ca5b354b25b634504f9e61895f2f966f0b04e8ef012784ecb8d","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-06-02T01:03:23.150365Z","signature_b64":"ec93DBYN6RAs6bltxrw0LuwvmLgw/u++gfmis2CLHili+HWTD715hs7Bio/88pnTj8c0bsX0K7xsS5lCHaj8Cg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"a9c0e2f7357b6ca5b354b25b634504f9e61895f2f966f0b04e8ef012784ecb8d","last_reissued_at":"2026-06-02T01:03:23.149961Z","signature_status":"signed_v1","first_computed_at":"2026-06-02T01:03:23.149961Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2606.00263","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":"2026-06-02T01:03:23Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"aJOwwx6NQ83YU/21Hw+rxcMWcjjoiMGSJvVWgeXyzVajl3d8JPk30Hi1Sswl7R4r53izJ/4qzI1gUANZWb9dBQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-04T21:08:36.483671Z"},"content_sha256":"e030dd75c89af60d995476751938f684a2e48da079e899eb90b64a4d10175dd8","schema_version":"1.0","event_id":"sha256:e030dd75c89af60d995476751938f684a2e48da079e899eb90b64a4d10175dd8"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2026:VHAOF5ZVPNWKLM2UWJNWGRIE7H","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"ReFLEX: Length-Generalizable CSI Denoising for MIMO-OFDM via Relative-Frequency Bias","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["cs.LG"],"primary_cat":"eess.SP","authors_text":"Robert Potekhin, Vladimir Lyashev, Zhen Gao, Zhibin Zhang, Ziwei Wan","submitted_at":"2026-05-29T18:49:40Z","abstract_excerpt":"This letter studies CSI denoising for MIMO--OFDM with variable NR resource block (RB) allocations. ReFLEX is a length-generalizable Transformer whose frequency attention uses a relative-frequency position bias (RFPB) generated from subcarrier offsets. A single checkpoint handles unseen RB lengths and can be applied to sparse DM-RS observations in the tested RB5/RB10 PUSCH setup without retraining. In a 3GPP~TR~38.901 UMa NLOS channel, ReFLEX achieves about $-9.6$~dB NMSE on unseen RB lengths. In NR PUSCH/UL-SCH simulations, ReFLEX denoising followed by time-frequency interpolation reduces the "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2606.00263","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/2606.00263/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":"2026-06-02T01:03:23Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"QbVTjwvc0nwJQb6W6TztFmkZMW6940LBiN4XabcPc6I3OUvnqbGWGhU9rz+DE3yaQO/wIGXCZDvkEFAnrpyVBg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-04T21:08:36.484047Z"},"content_sha256":"f3ea1243eadd2594d0397f18888062016c220fa159ffbadfcb1a23370f8029ea","schema_version":"1.0","event_id":"sha256:f3ea1243eadd2594d0397f18888062016c220fa159ffbadfcb1a23370f8029ea"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/VHAOF5ZVPNWKLM2UWJNWGRIE7H/bundle.json","state_url":"https://pith.science/pith/VHAOF5ZVPNWKLM2UWJNWGRIE7H/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/VHAOF5ZVPNWKLM2UWJNWGRIE7H/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":"2026-06-04T21:08:36Z","links":{"resolver":"https://pith.science/pith/VHAOF5ZVPNWKLM2UWJNWGRIE7H","bundle":"https://pith.science/pith/VHAOF5ZVPNWKLM2UWJNWGRIE7H/bundle.json","state":"https://pith.science/pith/VHAOF5ZVPNWKLM2UWJNWGRIE7H/state.json","well_known_bundle":"https://pith.science/.well-known/pith/VHAOF5ZVPNWKLM2UWJNWGRIE7H/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2026:VHAOF5ZVPNWKLM2UWJNWGRIE7H","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":"2beebaac40f824193c56d04445c941555da91bc9a5cedaa376f3c46ae49399c9","cross_cats_sorted":["cs.LG"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SP","submitted_at":"2026-05-29T18:49:40Z","title_canon_sha256":"d8e9c94404f6277fe1963d6c97da08654375e6b9c072ebc46542abbe20292ca2"},"schema_version":"1.0","source":{"id":"2606.00263","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2606.00263","created_at":"2026-06-02T01:03:23Z"},{"alias_kind":"arxiv_version","alias_value":"2606.00263v1","created_at":"2026-06-02T01:03:23Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2606.00263","created_at":"2026-06-02T01:03:23Z"},{"alias_kind":"pith_short_12","alias_value":"VHAOF5ZVPNWK","created_at":"2026-06-02T01:03:23Z"},{"alias_kind":"pith_short_16","alias_value":"VHAOF5ZVPNWKLM2U","created_at":"2026-06-02T01:03:23Z"},{"alias_kind":"pith_short_8","alias_value":"VHAOF5ZV","created_at":"2026-06-02T01:03:23Z"}],"graph_snapshots":[{"event_id":"sha256:f3ea1243eadd2594d0397f18888062016c220fa159ffbadfcb1a23370f8029ea","target":"graph","created_at":"2026-06-02T01:03:23Z","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/2606.00263/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"This letter studies CSI denoising for MIMO--OFDM with variable NR resource block (RB) allocations. ReFLEX is a length-generalizable Transformer whose frequency attention uses a relative-frequency position bias (RFPB) generated from subcarrier offsets. A single checkpoint handles unseen RB lengths and can be applied to sparse DM-RS observations in the tested RB5/RB10 PUSCH setup without retraining. In a 3GPP~TR~38.901 UMa NLOS channel, ReFLEX achieves about $-9.6$~dB NMSE on unseen RB lengths. In NR PUSCH/UL-SCH simulations, ReFLEX denoising followed by time-frequency interpolation reduces the ","authors_text":"Robert Potekhin, Vladimir Lyashev, Zhen Gao, Zhibin Zhang, Ziwei Wan","cross_cats":["cs.LG"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SP","submitted_at":"2026-05-29T18:49:40Z","title":"ReFLEX: Length-Generalizable CSI Denoising for MIMO-OFDM via Relative-Frequency Bias"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2606.00263","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:e030dd75c89af60d995476751938f684a2e48da079e899eb90b64a4d10175dd8","target":"record","created_at":"2026-06-02T01:03:23Z","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":"2beebaac40f824193c56d04445c941555da91bc9a5cedaa376f3c46ae49399c9","cross_cats_sorted":["cs.LG"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SP","submitted_at":"2026-05-29T18:49:40Z","title_canon_sha256":"d8e9c94404f6277fe1963d6c97da08654375e6b9c072ebc46542abbe20292ca2"},"schema_version":"1.0","source":{"id":"2606.00263","kind":"arxiv","version":1}},"canonical_sha256":"a9c0e2f7357b6ca5b354b25b634504f9e61895f2f966f0b04e8ef012784ecb8d","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"a9c0e2f7357b6ca5b354b25b634504f9e61895f2f966f0b04e8ef012784ecb8d","first_computed_at":"2026-06-02T01:03:23.149961Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-06-02T01:03:23.149961Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"ec93DBYN6RAs6bltxrw0LuwvmLgw/u++gfmis2CLHili+HWTD715hs7Bio/88pnTj8c0bsX0K7xsS5lCHaj8Cg==","signature_status":"signed_v1","signed_at":"2026-06-02T01:03:23.150365Z","signed_message":"canonical_sha256_bytes"},"source_id":"2606.00263","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:e030dd75c89af60d995476751938f684a2e48da079e899eb90b64a4d10175dd8","sha256:f3ea1243eadd2594d0397f18888062016c220fa159ffbadfcb1a23370f8029ea"],"state_sha256":"22240b49bc5f84f885592d40d078ee7ca8fb30dddd094ccda1a3b829d8ed060f"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"2lxoy6J2PYB9M6+g3eDKxV010qteLLDk+ywN5eNyTtCV0nzQUPL7vMUiUZeVI/OzF+97rVZI/ipkAU/BFfnQBQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-04T21:08:36.486062Z","bundle_sha256":"a10be5983396461843e457f407a689ec2a8c1cf37b1970fd8047e2a29ad627f9"}}