{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2025:HANJ7JSIQ2B3ARAOGJLOGP7ZDH","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":"82a2d422f72c6019fc940f045359b7cc7963466b681a283c03f9d976e0d2f14b","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SP","submitted_at":"2025-01-06T12:53:24Z","title_canon_sha256":"46241178f0f1b85083d135cdaa47964f19840687e0878c52401b59a48ee863a5"},"schema_version":"1.0","source":{"id":"2501.02985","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2501.02985","created_at":"2026-07-05T10:54:41Z"},{"alias_kind":"arxiv_version","alias_value":"2501.02985v2","created_at":"2026-07-05T10:54:41Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2501.02985","created_at":"2026-07-05T10:54:41Z"},{"alias_kind":"pith_short_12","alias_value":"HANJ7JSIQ2B3","created_at":"2026-07-05T10:54:41Z"},{"alias_kind":"pith_short_16","alias_value":"HANJ7JSIQ2B3ARAO","created_at":"2026-07-05T10:54:41Z"},{"alias_kind":"pith_short_8","alias_value":"HANJ7JSI","created_at":"2026-07-05T10:54:41Z"}],"graph_snapshots":[{"event_id":"sha256:05e232f2d60c9e2f424149e78fa82be60183f9042c9c8d7e72c107d667366cb3","target":"graph","created_at":"2026-07-05T10:54:41Z","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/2501.02985/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"In this paper, we investigate the channel estimation challenge in reconfigurable intelligent surface (RIS)-aided near-field communication systems. Current channel estimation techniques require substantial pilot overhead and computational complexity, especially when the number of RIS elements is extremely large. To address this issue, we introduce a two-timescale channel estimation strategy that leverages the asymmetric coherence times of both the RIS-base station (BS) channel and the User-RIS channel. We derive a time-scaling property indicating that, for any two effective channels within the ","authors_text":"Jeongjae Lee, Songnam Hong","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SP","submitted_at":"2025-01-06T12:53:24Z","title":"Piecewise Beam Training and Channel Estimation for RIS-Aided Near-Field Communications"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2501.02985","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:cf2c0536a87bf94d2bb763d5372ee2cb96f6c068dc9c2f2b2afca9beb8239494","target":"record","created_at":"2026-07-05T10:54:41Z","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":"82a2d422f72c6019fc940f045359b7cc7963466b681a283c03f9d976e0d2f14b","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SP","submitted_at":"2025-01-06T12:53:24Z","title_canon_sha256":"46241178f0f1b85083d135cdaa47964f19840687e0878c52401b59a48ee863a5"},"schema_version":"1.0","source":{"id":"2501.02985","kind":"arxiv","version":2}},"canonical_sha256":"381a9fa6488683b0440e3256e33ff919dc632ab877bae5edbe1a75d67c1be60c","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"381a9fa6488683b0440e3256e33ff919dc632ab877bae5edbe1a75d67c1be60c","first_computed_at":"2026-07-05T10:54:41.337219Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T10:54:41.337219Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"OVPOV2oCAC0ladzTEyCMPCO243JrmSWeRXN0gUAj8X/uXcidJGUMkycDMGK5+Av0BBE8bAzqiUQPZh/cbOgcBw==","signature_status":"signed_v1","signed_at":"2026-07-05T10:54:41.337731Z","signed_message":"canonical_sha256_bytes"},"source_id":"2501.02985","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:cf2c0536a87bf94d2bb763d5372ee2cb96f6c068dc9c2f2b2afca9beb8239494","sha256:05e232f2d60c9e2f424149e78fa82be60183f9042c9c8d7e72c107d667366cb3"],"state_sha256":"e8fb0d982b1f111a00760e4854494ef96944e6f745e7160d361e33981ae2fe30"}