{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2026:QBNRLNKR6GT67P7GKLG4SDP2VF","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":"6e20f840751a5de548163519dbfd08fd8c91eec4093c6ea356ecb3b7d68763a4","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"eess.SP","submitted_at":"2026-05-29T23:19:19Z","title_canon_sha256":"3926f9e2a4a242903ebfb289fe1375dd16feb0ad527593ca58ed0c7bca7b2ddf"},"schema_version":"1.0","source":{"id":"2606.00423","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2606.00423","created_at":"2026-06-02T01:03:54Z"},{"alias_kind":"arxiv_version","alias_value":"2606.00423v1","created_at":"2026-06-02T01:03:54Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2606.00423","created_at":"2026-06-02T01:03:54Z"},{"alias_kind":"pith_short_12","alias_value":"QBNRLNKR6GT6","created_at":"2026-06-02T01:03:54Z"},{"alias_kind":"pith_short_16","alias_value":"QBNRLNKR6GT67P7G","created_at":"2026-06-02T01:03:54Z"},{"alias_kind":"pith_short_8","alias_value":"QBNRLNKR","created_at":"2026-06-02T01:03:54Z"}],"graph_snapshots":[{"event_id":"sha256:d76e2950dab5e2655f70e1047569bb13fe3cec664c198e51ffe98f40ee113b78","target":"graph","created_at":"2026-06-02T01:03:54Z","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"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/2606.00423/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"This paper addresses joint channel and symbol estimation in reconfigurable intelligent surface (RIS)-aided multiuser uplink systems with fluid antennas (FAs) at the base station. We propose the Nested Tucker for Fluid Antenna Systems (NTFAS) protocol, in which FA port selection and user-dependent coding vary across blocks while the transmitted symbol matrix is shared across observations. This structure yields coupled Tucker models with common channel and data factors. A two-stage semi-blind bilinear alternating least squares (BALS) receiver is then developed to estimate the cascaded channel an","authors_text":"Andr\\'e L. F. de Almeida, Daniel C. Alcantara, Gilderlan T. de Ara\\'ujo, Josu\\'e V. de Ara\\'ujo","cross_cats":[],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"eess.SP","submitted_at":"2026-05-29T23:19:19Z","title":"Joint Channel and Symbol Estimation for RIS-Assisted Fluid Antenna Systems"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2606.00423","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:ca9b44ee5255a1db32183996958cea7681642f2325b82b425e24ffa70996fc6a","target":"record","created_at":"2026-06-02T01:03:54Z","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":"6e20f840751a5de548163519dbfd08fd8c91eec4093c6ea356ecb3b7d68763a4","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"eess.SP","submitted_at":"2026-05-29T23:19:19Z","title_canon_sha256":"3926f9e2a4a242903ebfb289fe1375dd16feb0ad527593ca58ed0c7bca7b2ddf"},"schema_version":"1.0","source":{"id":"2606.00423","kind":"arxiv","version":1}},"canonical_sha256":"805b15b551f1a7efbfe652cdc90dfaa94ecd3d29b2f8527f7bf81b80c31866cc","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"805b15b551f1a7efbfe652cdc90dfaa94ecd3d29b2f8527f7bf81b80c31866cc","first_computed_at":"2026-06-02T01:03:54.212224Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-06-02T01:03:54.212224Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"aqKdNp/GDIgMGdFQqunGI097BULq9cvIf+/hIOH/QgHWo3qLhs2aS3r0LtoY40drvKfJXow580joBFGIbjqlCA==","signature_status":"signed_v1","signed_at":"2026-06-02T01:03:54.212626Z","signed_message":"canonical_sha256_bytes"},"source_id":"2606.00423","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:ca9b44ee5255a1db32183996958cea7681642f2325b82b425e24ffa70996fc6a","sha256:d76e2950dab5e2655f70e1047569bb13fe3cec664c198e51ffe98f40ee113b78"],"state_sha256":"7836d3c06faab307fdbbc7cea2f1c6a86240a5b765686d06617d6d79e0b9b157"}