{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2023:KSB7AY6YEFZAI6G2DTXVUVZMCW","short_pith_number":"pith:KSB7AY6Y","canonical_record":{"source":{"id":"2301.07968","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2023-01-19T09:47:29Z","cross_cats_sorted":["eess.SP","math.IT"],"title_canon_sha256":"c73c9079ea08b54bf0dd39fcc9049fa30367d1f055ee32dbf38e5dfd03697240","abstract_canon_sha256":"7bbbd9d45fb95898ef796757a990d320246a52a585b0cb8b7ff6b1b2a435a215"},"schema_version":"1.0"},"canonical_sha256":"5483f063d821720478da1cef5a572c15a617b15b2020404d1dfda6b1eaf9d135","source":{"kind":"arxiv","id":"2301.07968","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2301.07968","created_at":"2026-07-05T05:36:20Z"},{"alias_kind":"arxiv_version","alias_value":"2301.07968v2","created_at":"2026-07-05T05:36:20Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2301.07968","created_at":"2026-07-05T05:36:20Z"},{"alias_kind":"pith_short_12","alias_value":"KSB7AY6YEFZA","created_at":"2026-07-05T05:36:20Z"},{"alias_kind":"pith_short_16","alias_value":"KSB7AY6YEFZAI6G2","created_at":"2026-07-05T05:36:20Z"},{"alias_kind":"pith_short_8","alias_value":"KSB7AY6Y","created_at":"2026-07-05T05:36:20Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2023:KSB7AY6YEFZAI6G2DTXVUVZMCW","target":"record","payload":{"canonical_record":{"source":{"id":"2301.07968","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2023-01-19T09:47:29Z","cross_cats_sorted":["eess.SP","math.IT"],"title_canon_sha256":"c73c9079ea08b54bf0dd39fcc9049fa30367d1f055ee32dbf38e5dfd03697240","abstract_canon_sha256":"7bbbd9d45fb95898ef796757a990d320246a52a585b0cb8b7ff6b1b2a435a215"},"schema_version":"1.0"},"canonical_sha256":"5483f063d821720478da1cef5a572c15a617b15b2020404d1dfda6b1eaf9d135","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T05:36:20.579099Z","signature_b64":"zQjXbp/wHbT+i6BNnM5zW7+pFHHQ3jC/0RxCcm86jvtm7XrppKncMXXaND47Qxu+AKWvrwV9prL70jsxNS6NAQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"5483f063d821720478da1cef5a572c15a617b15b2020404d1dfda6b1eaf9d135","last_reissued_at":"2026-07-05T05:36:20.578465Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T05:36:20.578465Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2301.07968","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-05T05:36:20Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"6ezKpWx8mCvBympxUnStlUjNDO20JhQpQoffeojNraGvhg7ZPyI4GxshsL9vkcKTuBy5bAg7dutdGqESimffCw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-24T07:59:28.604765Z"},"content_sha256":"5f582f891368afcd8b9fc36c696cbabb120be1aae8ef7096a06b65b2068aeac8","schema_version":"1.0","event_id":"sha256:5f582f891368afcd8b9fc36c696cbabb120be1aae8ef7096a06b65b2068aeac8"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2023:KSB7AY6YEFZAI6G2DTXVUVZMCW","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"On the Degrees of Freedom of RIS-Aided Holographic MIMO Systems","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["eess.SP","math.IT"],"primary_cat":"cs.IT","authors_text":"Juan Carlos Ruiz-Sicilia, Marco Di Renzo, Merouane Debbah, Vincenzo Sciancalepore, Xavier Costa-Perez, Xuewen Qian","submitted_at":"2023-01-19T09:47:29Z","abstract_excerpt":"In this paper, we study surface-based communication systems based on different levels of channel state information for system optimization. We analyze the system performance in terms of rate and degrees of freedom (DoF). We show that the deployment of a reconfigurable intelligent surface (RIS) results in increasing the number of DoF, by extending the near-field region. Over Rician fading channels, we show that an RIS can be efficiently optimized only based on the positions of the transmitting and receiving surfaces, while providing good performance if the Rician fading factor is not too small."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2301.07968","kind":"arxiv","version":2},"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/2301.07968/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":"2026-07-05T05:36:20Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"fQXOTB4UpVIKfmU38ibUX7RoaQxo9zDA+YiBGg4fexeg89BJdat6cWWt3EyZQoR9TNvaKlmTIAj3qIsehhCuAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-24T07:59:28.605130Z"},"content_sha256":"b543bbb2a9e8fc64bf79cf4da9b9912ac4cdc16a5b5fa833d6e1e4436e94e53e","schema_version":"1.0","event_id":"sha256:b543bbb2a9e8fc64bf79cf4da9b9912ac4cdc16a5b5fa833d6e1e4436e94e53e"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/KSB7AY6YEFZAI6G2DTXVUVZMCW/bundle.json","state_url":"https://pith.science/pith/KSB7AY6YEFZAI6G2DTXVUVZMCW/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/KSB7AY6YEFZAI6G2DTXVUVZMCW/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":"2026-07-24T07:59:28Z","links":{"resolver":"https://pith.science/pith/KSB7AY6YEFZAI6G2DTXVUVZMCW","bundle":"https://pith.science/pith/KSB7AY6YEFZAI6G2DTXVUVZMCW/bundle.json","state":"https://pith.science/pith/KSB7AY6YEFZAI6G2DTXVUVZMCW/state.json","well_known_bundle":"https://pith.science/.well-known/pith/KSB7AY6YEFZAI6G2DTXVUVZMCW/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2023:KSB7AY6YEFZAI6G2DTXVUVZMCW","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":"7bbbd9d45fb95898ef796757a990d320246a52a585b0cb8b7ff6b1b2a435a215","cross_cats_sorted":["eess.SP","math.IT"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2023-01-19T09:47:29Z","title_canon_sha256":"c73c9079ea08b54bf0dd39fcc9049fa30367d1f055ee32dbf38e5dfd03697240"},"schema_version":"1.0","source":{"id":"2301.07968","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2301.07968","created_at":"2026-07-05T05:36:20Z"},{"alias_kind":"arxiv_version","alias_value":"2301.07968v2","created_at":"2026-07-05T05:36:20Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2301.07968","created_at":"2026-07-05T05:36:20Z"},{"alias_kind":"pith_short_12","alias_value":"KSB7AY6YEFZA","created_at":"2026-07-05T05:36:20Z"},{"alias_kind":"pith_short_16","alias_value":"KSB7AY6YEFZAI6G2","created_at":"2026-07-05T05:36:20Z"},{"alias_kind":"pith_short_8","alias_value":"KSB7AY6Y","created_at":"2026-07-05T05:36:20Z"}],"graph_snapshots":[{"event_id":"sha256:b543bbb2a9e8fc64bf79cf4da9b9912ac4cdc16a5b5fa833d6e1e4436e94e53e","target":"graph","created_at":"2026-07-05T05:36:20Z","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/2301.07968/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"In this paper, we study surface-based communication systems based on different levels of channel state information for system optimization. We analyze the system performance in terms of rate and degrees of freedom (DoF). We show that the deployment of a reconfigurable intelligent surface (RIS) results in increasing the number of DoF, by extending the near-field region. Over Rician fading channels, we show that an RIS can be efficiently optimized only based on the positions of the transmitting and receiving surfaces, while providing good performance if the Rician fading factor is not too small.","authors_text":"Juan Carlos Ruiz-Sicilia, Marco Di Renzo, Merouane Debbah, Vincenzo Sciancalepore, Xavier Costa-Perez, Xuewen Qian","cross_cats":["eess.SP","math.IT"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2023-01-19T09:47:29Z","title":"On the Degrees of Freedom of RIS-Aided Holographic MIMO Systems"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2301.07968","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":"sha256:5f582f891368afcd8b9fc36c696cbabb120be1aae8ef7096a06b65b2068aeac8","target":"record","created_at":"2026-07-05T05:36:20Z","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":"7bbbd9d45fb95898ef796757a990d320246a52a585b0cb8b7ff6b1b2a435a215","cross_cats_sorted":["eess.SP","math.IT"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2023-01-19T09:47:29Z","title_canon_sha256":"c73c9079ea08b54bf0dd39fcc9049fa30367d1f055ee32dbf38e5dfd03697240"},"schema_version":"1.0","source":{"id":"2301.07968","kind":"arxiv","version":2}},"canonical_sha256":"5483f063d821720478da1cef5a572c15a617b15b2020404d1dfda6b1eaf9d135","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"5483f063d821720478da1cef5a572c15a617b15b2020404d1dfda6b1eaf9d135","first_computed_at":"2026-07-05T05:36:20.578465Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T05:36:20.578465Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"zQjXbp/wHbT+i6BNnM5zW7+pFHHQ3jC/0RxCcm86jvtm7XrppKncMXXaND47Qxu+AKWvrwV9prL70jsxNS6NAQ==","signature_status":"signed_v1","signed_at":"2026-07-05T05:36:20.579099Z","signed_message":"canonical_sha256_bytes"},"source_id":"2301.07968","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:5f582f891368afcd8b9fc36c696cbabb120be1aae8ef7096a06b65b2068aeac8","sha256:b543bbb2a9e8fc64bf79cf4da9b9912ac4cdc16a5b5fa833d6e1e4436e94e53e"],"state_sha256":"814a56e27f8f62cda9054317521ad0842fb34e95a6b17d64154c88318fe16086"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"O22P2w1ry3KLph/YcVaeur2a17OAifmJEPslSVKSX+UwMHOj8ZCi22G3IPfqSJXwaT7a6zzw/UedTl3Dg2j0Dg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-07-24T07:59:28.607584Z","bundle_sha256":"1c2dbb36fc9e405a8991d01a0c5339386d5079bf50bf7ce1f64a28ff5522809f"}}