{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2024:22SHTK4KVE6EV66TPWRGA2FFSA","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":"6debc64a392a176b2da4513bd6771858daf5897be283de5e58eb4d780964707c","cross_cats_sorted":["eess.SP","math.IT"],"license":"http://creativecommons.org/licenses/by-nc-nd/4.0/","primary_cat":"cs.IT","submitted_at":"2024-06-04T09:58:54Z","title_canon_sha256":"2ccf912f15e307f68902a44145d0622b946c9c341feca763505d6ca089d9115e"},"schema_version":"1.0","source":{"id":"2406.02170","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2406.02170","created_at":"2026-07-05T08:27:15Z"},{"alias_kind":"arxiv_version","alias_value":"2406.02170v1","created_at":"2026-07-05T08:27:15Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2406.02170","created_at":"2026-07-05T08:27:15Z"},{"alias_kind":"pith_short_12","alias_value":"22SHTK4KVE6E","created_at":"2026-07-05T08:27:15Z"},{"alias_kind":"pith_short_16","alias_value":"22SHTK4KVE6EV66T","created_at":"2026-07-05T08:27:15Z"},{"alias_kind":"pith_short_8","alias_value":"22SHTK4K","created_at":"2026-07-05T08:27:15Z"}],"graph_snapshots":[{"event_id":"sha256:00cff110defa784a77b60a14fd9f432496a96315793004ed4a61cc2d525232f9","target":"graph","created_at":"2026-07-05T08:27:15Z","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/2406.02170/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"This paper addresses the problem of maximizing the capacity of a multiple-input multiple-output (MIMO) link assisted by a beyond-diagonal reconfigurable intelligent surface (BD-RIS). We maximize the capacity by alternately optimizing the transmit covariance matrix, and the BD-RIS scattering matrix, which, according to network theory, should be unitary and symmetric. These constraints make the optimization of BD-RIS more challenging than that of diagonal RIS. To find a stationary point of the capacity we maximize a sequence of quadratic problems in the manifold of unitary matrices. This leads t","authors_text":"Eduard Jorswieck, Ignacio Santamaria, Jes\\'us Guti\\'errez, Mohammad Soleymani","cross_cats":["eess.SP","math.IT"],"headline":"","license":"http://creativecommons.org/licenses/by-nc-nd/4.0/","primary_cat":"cs.IT","submitted_at":"2024-06-04T09:58:54Z","title":"MIMO Capacity Maximization with Beyond-Diagonal RIS"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2406.02170","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":"sha256:9c3b24cc6c49b79d6f4c91947c7e7dbde9134184fa335d5341c68a5c70dea314","target":"record","created_at":"2026-07-05T08:27:15Z","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":"6debc64a392a176b2da4513bd6771858daf5897be283de5e58eb4d780964707c","cross_cats_sorted":["eess.SP","math.IT"],"license":"http://creativecommons.org/licenses/by-nc-nd/4.0/","primary_cat":"cs.IT","submitted_at":"2024-06-04T09:58:54Z","title_canon_sha256":"2ccf912f15e307f68902a44145d0622b946c9c341feca763505d6ca089d9115e"},"schema_version":"1.0","source":{"id":"2406.02170","kind":"arxiv","version":1}},"canonical_sha256":"d6a479ab8aa93c4afbd37da26068a5902d3e79518deb831df5b85e487c2f38f4","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"d6a479ab8aa93c4afbd37da26068a5902d3e79518deb831df5b85e487c2f38f4","first_computed_at":"2026-07-05T08:27:15.464399Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T08:27:15.464399Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"3W80hHrz451azBc8brRXUGeFHWaDuu8kmTDARzEsqYOsZdFpBHNeVP5cEGDtp6HPhvJpKnAQzvLscswQ0w8GAg==","signature_status":"signed_v1","signed_at":"2026-07-05T08:27:15.464815Z","signed_message":"canonical_sha256_bytes"},"source_id":"2406.02170","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:9c3b24cc6c49b79d6f4c91947c7e7dbde9134184fa335d5341c68a5c70dea314","sha256:00cff110defa784a77b60a14fd9f432496a96315793004ed4a61cc2d525232f9"],"state_sha256":"bf4617df59af2689f68b327a522df8853aab517edf5b8a5bba6c0340c50ec9b8"}