{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2026:IN4JGNWOEJWI2SYJZ4XKHBHRRG","short_pith_number":"pith:IN4JGNWO","canonical_record":{"source":{"id":"2605.29679","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2026-05-28T09:40:32Z","cross_cats_sorted":["eess.SP","math.IT"],"title_canon_sha256":"f702f56e77f342e3b7c9114e5156f043250b562233e96e26e70f723b50d313f5","abstract_canon_sha256":"92524d80a8f87650e98e76fa1ea95b4215c228d938dcfe243d503de6735697fa"},"schema_version":"1.0"},"canonical_sha256":"43789336ce226c8d4b09cf2ea384f189a9e7b9be7a6ca425134abf8c1465a228","source":{"kind":"arxiv","id":"2605.29679","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2605.29679","created_at":"2026-05-29T01:05:55Z"},{"alias_kind":"arxiv_version","alias_value":"2605.29679v1","created_at":"2026-05-29T01:05:55Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2605.29679","created_at":"2026-05-29T01:05:55Z"},{"alias_kind":"pith_short_12","alias_value":"IN4JGNWOEJWI","created_at":"2026-05-29T01:05:55Z"},{"alias_kind":"pith_short_16","alias_value":"IN4JGNWOEJWI2SYJ","created_at":"2026-05-29T01:05:55Z"},{"alias_kind":"pith_short_8","alias_value":"IN4JGNWO","created_at":"2026-05-29T01:05:55Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2026:IN4JGNWOEJWI2SYJZ4XKHBHRRG","target":"record","payload":{"canonical_record":{"source":{"id":"2605.29679","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2026-05-28T09:40:32Z","cross_cats_sorted":["eess.SP","math.IT"],"title_canon_sha256":"f702f56e77f342e3b7c9114e5156f043250b562233e96e26e70f723b50d313f5","abstract_canon_sha256":"92524d80a8f87650e98e76fa1ea95b4215c228d938dcfe243d503de6735697fa"},"schema_version":"1.0"},"canonical_sha256":"43789336ce226c8d4b09cf2ea384f189a9e7b9be7a6ca425134abf8c1465a228","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-29T01:05:55.160516Z","signature_b64":"S7TshO/OlmvTAuTnIB/KUjGsK9Iuy5iv7wEpBkEDDua07HFuRJacsKhV+2Qaz2Z5r+3TayYEmsPyXVkMQgyQBw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"43789336ce226c8d4b09cf2ea384f189a9e7b9be7a6ca425134abf8c1465a228","last_reissued_at":"2026-05-29T01:05:55.159768Z","signature_status":"signed_v1","first_computed_at":"2026-05-29T01:05:55.159768Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2605.29679","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":"2026-05-29T01:05:55Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"WcAtcS2Vev/8HmUrMu45zYLnV4fo1w1o5WodhMD6yIXrZl7Z9AMhKB2JTzytonfmGwsC/QHByUnc3qiwtXOuDw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-02T00:41:04.436854Z"},"content_sha256":"9cbca021b727f2d668a933c7f634762b8a83df3dad68e78fdd7c59e215e40583","schema_version":"1.0","event_id":"sha256:9cbca021b727f2d668a933c7f634762b8a83df3dad68e78fdd7c59e215e40583"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2026:IN4JGNWOEJWI2SYJZ4XKHBHRRG","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"A Unified Two-Stage Generative Diffusion Framework for Channel Estimation and Port Selection in Multiuser MIMO-FAS","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["eess.SP","math.IT"],"primary_cat":"cs.IT","authors_text":"Erqiang Tang, Hengtao He, Jun Zhang, Khaled B. Letaief, Shenghui Song, Wei Guo","submitted_at":"2026-05-28T09:40:32Z","abstract_excerpt":"Fluid antenna systems (FAS) have emerged as a promising technology for next-generation wireless systems. However, practical multiuser multiple-input multiple-output FAS (MIMO-FAS) faces two inherently coupled challenges: acquiring accurate high-dimensional channel state information (CSI) from limited RF chains and solving the combinatorial port selection problem, where the effectiveness of the latter highly depends on the result of the former. In this paper, we propose a unified two-stage diffusion framework that formulates the joint task as a maximum-a-posteriori (MAP) inference problem and d"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2605.29679","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/2605.29679/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":"2026-05-29T01:05:55Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"NorN5DaLfgkqpLb5M1RsqAvfqP69zHYH5M5uMV70THdVbdE6r73ik7TVVwEPH56x5Eicy7Z+EV49yfu3H6waCQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-02T00:41:04.437235Z"},"content_sha256":"cf1d941dfc731d707abe1b4a71c9f58bbbba6dbed89d18d06d8deae3d32b0a28","schema_version":"1.0","event_id":"sha256:cf1d941dfc731d707abe1b4a71c9f58bbbba6dbed89d18d06d8deae3d32b0a28"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/IN4JGNWOEJWI2SYJZ4XKHBHRRG/bundle.json","state_url":"https://pith.science/pith/IN4JGNWOEJWI2SYJZ4XKHBHRRG/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/IN4JGNWOEJWI2SYJZ4XKHBHRRG/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":"2026-06-02T00:41:04Z","links":{"resolver":"https://pith.science/pith/IN4JGNWOEJWI2SYJZ4XKHBHRRG","bundle":"https://pith.science/pith/IN4JGNWOEJWI2SYJZ4XKHBHRRG/bundle.json","state":"https://pith.science/pith/IN4JGNWOEJWI2SYJZ4XKHBHRRG/state.json","well_known_bundle":"https://pith.science/.well-known/pith/IN4JGNWOEJWI2SYJZ4XKHBHRRG/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2026:IN4JGNWOEJWI2SYJZ4XKHBHRRG","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":"92524d80a8f87650e98e76fa1ea95b4215c228d938dcfe243d503de6735697fa","cross_cats_sorted":["eess.SP","math.IT"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2026-05-28T09:40:32Z","title_canon_sha256":"f702f56e77f342e3b7c9114e5156f043250b562233e96e26e70f723b50d313f5"},"schema_version":"1.0","source":{"id":"2605.29679","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2605.29679","created_at":"2026-05-29T01:05:55Z"},{"alias_kind":"arxiv_version","alias_value":"2605.29679v1","created_at":"2026-05-29T01:05:55Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2605.29679","created_at":"2026-05-29T01:05:55Z"},{"alias_kind":"pith_short_12","alias_value":"IN4JGNWOEJWI","created_at":"2026-05-29T01:05:55Z"},{"alias_kind":"pith_short_16","alias_value":"IN4JGNWOEJWI2SYJ","created_at":"2026-05-29T01:05:55Z"},{"alias_kind":"pith_short_8","alias_value":"IN4JGNWO","created_at":"2026-05-29T01:05:55Z"}],"graph_snapshots":[{"event_id":"sha256:cf1d941dfc731d707abe1b4a71c9f58bbbba6dbed89d18d06d8deae3d32b0a28","target":"graph","created_at":"2026-05-29T01:05:55Z","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/2605.29679/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Fluid antenna systems (FAS) have emerged as a promising technology for next-generation wireless systems. However, practical multiuser multiple-input multiple-output FAS (MIMO-FAS) faces two inherently coupled challenges: acquiring accurate high-dimensional channel state information (CSI) from limited RF chains and solving the combinatorial port selection problem, where the effectiveness of the latter highly depends on the result of the former. In this paper, we propose a unified two-stage diffusion framework that formulates the joint task as a maximum-a-posteriori (MAP) inference problem and d","authors_text":"Erqiang Tang, Hengtao He, Jun Zhang, Khaled B. Letaief, Shenghui Song, Wei Guo","cross_cats":["eess.SP","math.IT"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2026-05-28T09:40:32Z","title":"A Unified Two-Stage Generative Diffusion Framework for Channel Estimation and Port Selection in Multiuser MIMO-FAS"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2605.29679","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":"sha256:9cbca021b727f2d668a933c7f634762b8a83df3dad68e78fdd7c59e215e40583","target":"record","created_at":"2026-05-29T01:05:55Z","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":"92524d80a8f87650e98e76fa1ea95b4215c228d938dcfe243d503de6735697fa","cross_cats_sorted":["eess.SP","math.IT"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2026-05-28T09:40:32Z","title_canon_sha256":"f702f56e77f342e3b7c9114e5156f043250b562233e96e26e70f723b50d313f5"},"schema_version":"1.0","source":{"id":"2605.29679","kind":"arxiv","version":1}},"canonical_sha256":"43789336ce226c8d4b09cf2ea384f189a9e7b9be7a6ca425134abf8c1465a228","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"43789336ce226c8d4b09cf2ea384f189a9e7b9be7a6ca425134abf8c1465a228","first_computed_at":"2026-05-29T01:05:55.159768Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-29T01:05:55.159768Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"S7TshO/OlmvTAuTnIB/KUjGsK9Iuy5iv7wEpBkEDDua07HFuRJacsKhV+2Qaz2Z5r+3TayYEmsPyXVkMQgyQBw==","signature_status":"signed_v1","signed_at":"2026-05-29T01:05:55.160516Z","signed_message":"canonical_sha256_bytes"},"source_id":"2605.29679","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:9cbca021b727f2d668a933c7f634762b8a83df3dad68e78fdd7c59e215e40583","sha256:cf1d941dfc731d707abe1b4a71c9f58bbbba6dbed89d18d06d8deae3d32b0a28"],"state_sha256":"3f007330d80a900f95fbacb01fca5eec4e54b786a8b7cd1aa16889bc124947b4"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"jVQEUrnVeI3F52OYnPtuqVOkvCZEtkL0XPr1xBhK6V+MWqivcfIjgN3GR3wt3vWk7QluJMFBSOONtE/2bmIACQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-02T00:41:04.439511Z","bundle_sha256":"b972c3a7114e5ddc04fce3e43f8446b3ea1cbe97254c25d78bcc391bf98c72ae"}}