{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2026:CXWIJLPGFXPOBYLZ2OOMYXJLHW","short_pith_number":"pith:CXWIJLPG","canonical_record":{"source":{"id":"2605.19790","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SP","submitted_at":"2026-05-19T12:55:30Z","cross_cats_sorted":[],"title_canon_sha256":"0a26a668aa58c288acf6647f77171e4e404bee7e5800e35019b5af11cbf4fd21","abstract_canon_sha256":"2ca06383c77e0a2f3933501dacd333fafc14d1049f626d268fdc0f1a136ce885"},"schema_version":"1.0"},"canonical_sha256":"15ec84ade62ddee0e179d39ccc5d2b3da02aaeac267690fd6b9c07d47f4b0803","source":{"kind":"arxiv","id":"2605.19790","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2605.19790","created_at":"2026-05-20T01:06:14Z"},{"alias_kind":"arxiv_version","alias_value":"2605.19790v1","created_at":"2026-05-20T01:06:14Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2605.19790","created_at":"2026-05-20T01:06:14Z"},{"alias_kind":"pith_short_12","alias_value":"CXWIJLPGFXPO","created_at":"2026-05-20T01:06:14Z"},{"alias_kind":"pith_short_16","alias_value":"CXWIJLPGFXPOBYLZ","created_at":"2026-05-20T01:06:14Z"},{"alias_kind":"pith_short_8","alias_value":"CXWIJLPG","created_at":"2026-05-20T01:06:14Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2026:CXWIJLPGFXPOBYLZ2OOMYXJLHW","target":"record","payload":{"canonical_record":{"source":{"id":"2605.19790","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SP","submitted_at":"2026-05-19T12:55:30Z","cross_cats_sorted":[],"title_canon_sha256":"0a26a668aa58c288acf6647f77171e4e404bee7e5800e35019b5af11cbf4fd21","abstract_canon_sha256":"2ca06383c77e0a2f3933501dacd333fafc14d1049f626d268fdc0f1a136ce885"},"schema_version":"1.0"},"canonical_sha256":"15ec84ade62ddee0e179d39ccc5d2b3da02aaeac267690fd6b9c07d47f4b0803","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-20T01:06:14.184284Z","signature_b64":"LMnnaZLqehZA5qMt9lWlrR2iXQgWc7F+x0hzOCFEMgR2FCGZEPpdpusV3XJTUzwJAlp0bI8790fENpQqpYNlCw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"15ec84ade62ddee0e179d39ccc5d2b3da02aaeac267690fd6b9c07d47f4b0803","last_reissued_at":"2026-05-20T01:06:14.183282Z","signature_status":"signed_v1","first_computed_at":"2026-05-20T01:06:14.183282Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2605.19790","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":"2026-05-20T01:06:14Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"ljhM6uEaA6+aCvYW605ANjkILO/+GlDpz/I97Irwio/A56o3oZnafCTPml1rPcjIWqxRZMKs6VLtJGQ9YcfEAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-28T04:53:08.534896Z"},"content_sha256":"e9184ee0d07bea79dc3d279f217696f65b423d0649bb110531026d098af35ea1","schema_version":"1.0","event_id":"sha256:e9184ee0d07bea79dc3d279f217696f65b423d0649bb110531026d098af35ea1"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2026:CXWIJLPGFXPOBYLZ2OOMYXJLHW","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Channel Estimation for Beyond Diagonal RIS-Aided Multi-User mmWave Systems","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"eess.SP","authors_text":"Cunhua Pan, Hong Ren, Jiangzhou Wang, Linyu Peng, Taihao Zhang, Tian Qiu","submitted_at":"2026-05-19T12:55:30Z","abstract_excerpt":"Beyond diagonal reconfigurable intelligent surface (BD-RIS) represents a promising architecture for advancing millimeter-wave (mmWave) communications. However, its intricate inter-element connections invalidate the conventional decoupled mathematical structure, thereby severely complicating cascaded channel estimation. In this paper, we formulate a novel block-Kronecker-structured cascaded channel model for a \\textit{group-connected} BD-RIS-aided multi-user (MU) mmWave system equipped with uniform planar arrays (UPAs). By exploiting the cascaded channel sparsity, an efficient three-stage estim"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2605.19790","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/2605.19790/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":"2026-05-20T01:06:14Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"ILtiTxg9K2amCJYW9fTis4vs2V0mn5KcfPBAHyORQ9PW74slUSgtQ1Mj+7X2p4pfa7watMoZTnYpOxfU/HFRCw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-28T04:53:08.535579Z"},"content_sha256":"e3e805af3284447f8e8bc24c96c2e5d2b05567596394306fd36a7efde7bd59db","schema_version":"1.0","event_id":"sha256:e3e805af3284447f8e8bc24c96c2e5d2b05567596394306fd36a7efde7bd59db"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/CXWIJLPGFXPOBYLZ2OOMYXJLHW/bundle.json","state_url":"https://pith.science/pith/CXWIJLPGFXPOBYLZ2OOMYXJLHW/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/CXWIJLPGFXPOBYLZ2OOMYXJLHW/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":"2026-05-28T04:53:08Z","links":{"resolver":"https://pith.science/pith/CXWIJLPGFXPOBYLZ2OOMYXJLHW","bundle":"https://pith.science/pith/CXWIJLPGFXPOBYLZ2OOMYXJLHW/bundle.json","state":"https://pith.science/pith/CXWIJLPGFXPOBYLZ2OOMYXJLHW/state.json","well_known_bundle":"https://pith.science/.well-known/pith/CXWIJLPGFXPOBYLZ2OOMYXJLHW/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2026:CXWIJLPGFXPOBYLZ2OOMYXJLHW","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":"2ca06383c77e0a2f3933501dacd333fafc14d1049f626d268fdc0f1a136ce885","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SP","submitted_at":"2026-05-19T12:55:30Z","title_canon_sha256":"0a26a668aa58c288acf6647f77171e4e404bee7e5800e35019b5af11cbf4fd21"},"schema_version":"1.0","source":{"id":"2605.19790","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2605.19790","created_at":"2026-05-20T01:06:14Z"},{"alias_kind":"arxiv_version","alias_value":"2605.19790v1","created_at":"2026-05-20T01:06:14Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2605.19790","created_at":"2026-05-20T01:06:14Z"},{"alias_kind":"pith_short_12","alias_value":"CXWIJLPGFXPO","created_at":"2026-05-20T01:06:14Z"},{"alias_kind":"pith_short_16","alias_value":"CXWIJLPGFXPOBYLZ","created_at":"2026-05-20T01:06:14Z"},{"alias_kind":"pith_short_8","alias_value":"CXWIJLPG","created_at":"2026-05-20T01:06:14Z"}],"graph_snapshots":[{"event_id":"sha256:e3e805af3284447f8e8bc24c96c2e5d2b05567596394306fd36a7efde7bd59db","target":"graph","created_at":"2026-05-20T01:06:14Z","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/2605.19790/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Beyond diagonal reconfigurable intelligent surface (BD-RIS) represents a promising architecture for advancing millimeter-wave (mmWave) communications. However, its intricate inter-element connections invalidate the conventional decoupled mathematical structure, thereby severely complicating cascaded channel estimation. In this paper, we formulate a novel block-Kronecker-structured cascaded channel model for a \\textit{group-connected} BD-RIS-aided multi-user (MU) mmWave system equipped with uniform planar arrays (UPAs). By exploiting the cascaded channel sparsity, an efficient three-stage estim","authors_text":"Cunhua Pan, Hong Ren, Jiangzhou Wang, Linyu Peng, Taihao Zhang, Tian Qiu","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SP","submitted_at":"2026-05-19T12:55:30Z","title":"Channel Estimation for Beyond Diagonal RIS-Aided Multi-User mmWave Systems"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2605.19790","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:e9184ee0d07bea79dc3d279f217696f65b423d0649bb110531026d098af35ea1","target":"record","created_at":"2026-05-20T01:06:14Z","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":"2ca06383c77e0a2f3933501dacd333fafc14d1049f626d268fdc0f1a136ce885","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SP","submitted_at":"2026-05-19T12:55:30Z","title_canon_sha256":"0a26a668aa58c288acf6647f77171e4e404bee7e5800e35019b5af11cbf4fd21"},"schema_version":"1.0","source":{"id":"2605.19790","kind":"arxiv","version":1}},"canonical_sha256":"15ec84ade62ddee0e179d39ccc5d2b3da02aaeac267690fd6b9c07d47f4b0803","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"15ec84ade62ddee0e179d39ccc5d2b3da02aaeac267690fd6b9c07d47f4b0803","first_computed_at":"2026-05-20T01:06:14.183282Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-20T01:06:14.183282Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"LMnnaZLqehZA5qMt9lWlrR2iXQgWc7F+x0hzOCFEMgR2FCGZEPpdpusV3XJTUzwJAlp0bI8790fENpQqpYNlCw==","signature_status":"signed_v1","signed_at":"2026-05-20T01:06:14.184284Z","signed_message":"canonical_sha256_bytes"},"source_id":"2605.19790","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:e9184ee0d07bea79dc3d279f217696f65b423d0649bb110531026d098af35ea1","sha256:e3e805af3284447f8e8bc24c96c2e5d2b05567596394306fd36a7efde7bd59db"],"state_sha256":"f0ec85e22f4da5276b5af52d415d08938f114055d968c7e168c51035199f7e34"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"bKNmT+1g5cFlUAc4Y9osoKIewNEBJWkzbJtC2mfSkTmSMbNo0Z/+5bYZwSyauSNu1eAAdGFuzLDxDub2RoGjDQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-28T04:53:08.538737Z","bundle_sha256":"d79208b34a9760c6870c5e32929d8ca384991b03964d81ffb93ceb4ecf4fb663"}}