{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2024:UNGT46EVS46URRR6KMVEW3IC6F","short_pith_number":"pith:UNGT46EV","canonical_record":{"source":{"id":"2412.13683","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SP","submitted_at":"2024-12-18T10:17:55Z","cross_cats_sorted":[],"title_canon_sha256":"6cf82e0f0597d445bc07efd93511f0305988df886a6d80cb9d04f47c918decad","abstract_canon_sha256":"d6f8dbd6e15ab9f27a686e10a6d2f053136cb696e3e6523f3e5b262bec25accc"},"schema_version":"1.0"},"canonical_sha256":"a34d3e7895973d48c63e532a4b6d02f14078ada9476beaa218055926c4f401de","source":{"kind":"arxiv","id":"2412.13683","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2412.13683","created_at":"2026-07-05T09:51:06Z"},{"alias_kind":"arxiv_version","alias_value":"2412.13683v1","created_at":"2026-07-05T09:51:06Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2412.13683","created_at":"2026-07-05T09:51:06Z"},{"alias_kind":"pith_short_12","alias_value":"UNGT46EVS46U","created_at":"2026-07-05T09:51:06Z"},{"alias_kind":"pith_short_16","alias_value":"UNGT46EVS46URRR6","created_at":"2026-07-05T09:51:06Z"},{"alias_kind":"pith_short_8","alias_value":"UNGT46EV","created_at":"2026-07-05T09:51:06Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2024:UNGT46EVS46URRR6KMVEW3IC6F","target":"record","payload":{"canonical_record":{"source":{"id":"2412.13683","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SP","submitted_at":"2024-12-18T10:17:55Z","cross_cats_sorted":[],"title_canon_sha256":"6cf82e0f0597d445bc07efd93511f0305988df886a6d80cb9d04f47c918decad","abstract_canon_sha256":"d6f8dbd6e15ab9f27a686e10a6d2f053136cb696e3e6523f3e5b262bec25accc"},"schema_version":"1.0"},"canonical_sha256":"a34d3e7895973d48c63e532a4b6d02f14078ada9476beaa218055926c4f401de","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T09:51:06.460822Z","signature_b64":"VRH1zC+dj4aovoyo5w1wH43dulHI3vXVa0fkzebVfGB5e/Zt3pTYHD1sMwC412Kdw19frMtooaLy1Wab3wG9CQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"a34d3e7895973d48c63e532a4b6d02f14078ada9476beaa218055926c4f401de","last_reissued_at":"2026-07-05T09:51:06.460259Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T09:51:06.460259Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2412.13683","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":"2026-07-05T09:51:06Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"4tsCHTRa3fbX2hOQtYj/rfKxZ8+u9VwlaOqbX7F0UwHaQVKUWXS76qB/8A1pysODQKy53CNQxXN+/FOOgUazBw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-18T10:30:26.856185Z"},"content_sha256":"8e5973d86c42846be9c32390bcacf50f0297de5eddc9ceb55e0bde2c200b317c","schema_version":"1.0","event_id":"sha256:8e5973d86c42846be9c32390bcacf50f0297de5eddc9ceb55e0bde2c200b317c"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2024:UNGT46EVS46URRR6KMVEW3IC6F","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Exploiting Mutual Coupling Characteristics for Channel Estimation in Holographic MIMO","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"eess.SP","authors_text":"Emil Bj\\\"ornson, Nikolaos Kolomvakis","submitted_at":"2024-12-18T10:17:55Z","abstract_excerpt":"Holographic multiple-input multiple-output (MIMO) systems represent a spatially constrained MIMO architecture with a massive number of antennas with small antenna spacing as a close approximation of a spatially continuous electromagnetic aperture. Accurate channel modeling is essential for realizing the full potential of this technology. In this paper, we investigate the impact of mutual coupling and spatial channel correlation on the estimation precision in holographic MIMO systems, as well as the importance of knowing their characteristics. We demonstrate that neglecting mutual coupling can "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2412.13683","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/2412.13683/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":"2026-07-05T09:51:06Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"ocpIdc0sVNmnS+xYvFQDaPUMJkAuYccfTSvx7XRMxsd0UkRnc+1I5j9xIGIrcTfCRkULTou+5aGbh1p84aeFAA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-18T10:30:26.857083Z"},"content_sha256":"3d36f72ecaa304aa5b54166cdcfefbd0ecdc7e588d894dc8bb2965c811a9df4e","schema_version":"1.0","event_id":"sha256:3d36f72ecaa304aa5b54166cdcfefbd0ecdc7e588d894dc8bb2965c811a9df4e"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/UNGT46EVS46URRR6KMVEW3IC6F/bundle.json","state_url":"https://pith.science/pith/UNGT46EVS46URRR6KMVEW3IC6F/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/UNGT46EVS46URRR6KMVEW3IC6F/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":"2026-08-18T10:30:26Z","links":{"resolver":"https://pith.science/pith/UNGT46EVS46URRR6KMVEW3IC6F","bundle":"https://pith.science/pith/UNGT46EVS46URRR6KMVEW3IC6F/bundle.json","state":"https://pith.science/pith/UNGT46EVS46URRR6KMVEW3IC6F/state.json","well_known_bundle":"https://pith.science/.well-known/pith/UNGT46EVS46URRR6KMVEW3IC6F/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2024:UNGT46EVS46URRR6KMVEW3IC6F","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":"d6f8dbd6e15ab9f27a686e10a6d2f053136cb696e3e6523f3e5b262bec25accc","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SP","submitted_at":"2024-12-18T10:17:55Z","title_canon_sha256":"6cf82e0f0597d445bc07efd93511f0305988df886a6d80cb9d04f47c918decad"},"schema_version":"1.0","source":{"id":"2412.13683","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2412.13683","created_at":"2026-07-05T09:51:06Z"},{"alias_kind":"arxiv_version","alias_value":"2412.13683v1","created_at":"2026-07-05T09:51:06Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2412.13683","created_at":"2026-07-05T09:51:06Z"},{"alias_kind":"pith_short_12","alias_value":"UNGT46EVS46U","created_at":"2026-07-05T09:51:06Z"},{"alias_kind":"pith_short_16","alias_value":"UNGT46EVS46URRR6","created_at":"2026-07-05T09:51:06Z"},{"alias_kind":"pith_short_8","alias_value":"UNGT46EV","created_at":"2026-07-05T09:51:06Z"}],"graph_snapshots":[{"event_id":"sha256:3d36f72ecaa304aa5b54166cdcfefbd0ecdc7e588d894dc8bb2965c811a9df4e","target":"graph","created_at":"2026-07-05T09:51:06Z","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/2412.13683/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Holographic multiple-input multiple-output (MIMO) systems represent a spatially constrained MIMO architecture with a massive number of antennas with small antenna spacing as a close approximation of a spatially continuous electromagnetic aperture. Accurate channel modeling is essential for realizing the full potential of this technology. In this paper, we investigate the impact of mutual coupling and spatial channel correlation on the estimation precision in holographic MIMO systems, as well as the importance of knowing their characteristics. We demonstrate that neglecting mutual coupling can ","authors_text":"Emil Bj\\\"ornson, Nikolaos Kolomvakis","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SP","submitted_at":"2024-12-18T10:17:55Z","title":"Exploiting Mutual Coupling Characteristics for Channel Estimation in Holographic MIMO"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2412.13683","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":"sha256:8e5973d86c42846be9c32390bcacf50f0297de5eddc9ceb55e0bde2c200b317c","target":"record","created_at":"2026-07-05T09:51:06Z","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":"d6f8dbd6e15ab9f27a686e10a6d2f053136cb696e3e6523f3e5b262bec25accc","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SP","submitted_at":"2024-12-18T10:17:55Z","title_canon_sha256":"6cf82e0f0597d445bc07efd93511f0305988df886a6d80cb9d04f47c918decad"},"schema_version":"1.0","source":{"id":"2412.13683","kind":"arxiv","version":1}},"canonical_sha256":"a34d3e7895973d48c63e532a4b6d02f14078ada9476beaa218055926c4f401de","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"a34d3e7895973d48c63e532a4b6d02f14078ada9476beaa218055926c4f401de","first_computed_at":"2026-07-05T09:51:06.460259Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T09:51:06.460259Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"VRH1zC+dj4aovoyo5w1wH43dulHI3vXVa0fkzebVfGB5e/Zt3pTYHD1sMwC412Kdw19frMtooaLy1Wab3wG9CQ==","signature_status":"signed_v1","signed_at":"2026-07-05T09:51:06.460822Z","signed_message":"canonical_sha256_bytes"},"source_id":"2412.13683","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:8e5973d86c42846be9c32390bcacf50f0297de5eddc9ceb55e0bde2c200b317c","sha256:3d36f72ecaa304aa5b54166cdcfefbd0ecdc7e588d894dc8bb2965c811a9df4e"],"state_sha256":"a1a469469945ee3d141155d77d59e6a42f8d9a5366e592f6406ba26d20bc2749"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"WZYsfhRgQyVJ+NHP28NRklcrcxq+I+gvS9yzds0LVcEnMT0ktl672uQ6qIkmmKMUbPLrZNivw6hjYi32MMErCA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-18T10:30:26.864429Z","bundle_sha256":"880a778fb164dc4f245b34d36b94614995e2d0c1eec90e901e4b637b012f3f83"}}