{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2024:AXBF7CUROWPO3ZU622EJHEQACE","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":"baadd291e058648630b70d8f4b259da92f06539973c3bede39279040ac56ed8d","cross_cats_sorted":["eess.SP","math.IT"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2024-03-27T07:10:09Z","title_canon_sha256":"c0273f021bffec2103808feb3ee6ef94f0501d4db829746e8b6bff0c497d1c95"},"schema_version":"1.0","source":{"id":"2403.18307","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2403.18307","created_at":"2026-07-05T08:59:06Z"},{"alias_kind":"arxiv_version","alias_value":"2403.18307v2","created_at":"2026-07-05T08:59:06Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2403.18307","created_at":"2026-07-05T08:59:06Z"},{"alias_kind":"pith_short_12","alias_value":"AXBF7CUROWPO","created_at":"2026-07-05T08:59:06Z"},{"alias_kind":"pith_short_16","alias_value":"AXBF7CUROWPO3ZU6","created_at":"2026-07-05T08:59:06Z"},{"alias_kind":"pith_short_8","alias_value":"AXBF7CUR","created_at":"2026-07-05T08:59:06Z"}],"graph_snapshots":[{"event_id":"sha256:57a5b7d739105e32c3cdb400cffc68d2f2f8ae0c8e6f25747d63b6dc26994b3e","target":"graph","created_at":"2026-07-05T08:59:06Z","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/2403.18307/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"In the context of emerging stacked intelligent metasurface (SIM)-based holographic MIMO (HMIMO) systems, a fundamental problem is to study the mutual information (MI) between transmitted and received signals to establish their capacity. However, direct optimization or analytical evaluation of the MI, particularly for discrete signaling, is often intractable. To address this challenge, we adopt the channel cutoff rate (CR) as an alternative optimization metric for the MI maximization. In this regard, we propose an alternating projected gradient method (APGM), which optimizes the CR of a SIM-bas","authors_text":"Le-Nam Tran, Nemanja Stefan Perovi\\'c","cross_cats":["eess.SP","math.IT"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2024-03-27T07:10:09Z","title":"Mutual Information Optimization for SIM-Based Holographic MIMO Systems"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2403.18307","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":"sha256:107448eb274604a50ab742de7919699611dfdd9d2f1fb4c22e500c5343e29cbf","target":"record","created_at":"2026-07-05T08:59:06Z","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":"baadd291e058648630b70d8f4b259da92f06539973c3bede39279040ac56ed8d","cross_cats_sorted":["eess.SP","math.IT"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2024-03-27T07:10:09Z","title_canon_sha256":"c0273f021bffec2103808feb3ee6ef94f0501d4db829746e8b6bff0c497d1c95"},"schema_version":"1.0","source":{"id":"2403.18307","kind":"arxiv","version":2}},"canonical_sha256":"05c25f8a91759eede69ed6889392001109173cff3ff72fedee0e9436c8b2d29f","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"05c25f8a91759eede69ed6889392001109173cff3ff72fedee0e9436c8b2d29f","first_computed_at":"2026-07-05T08:59:06.614777Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T08:59:06.614777Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"ZzwoDu4Z4VtYa01k+uZKWKtmBpPrKLiS104SL+0JQGoXebfpc1EK3TmTL10aHhaw9fZZ1/Rfv9DYmZTtQ2ZlDQ==","signature_status":"signed_v1","signed_at":"2026-07-05T08:59:06.615273Z","signed_message":"canonical_sha256_bytes"},"source_id":"2403.18307","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:107448eb274604a50ab742de7919699611dfdd9d2f1fb4c22e500c5343e29cbf","sha256:57a5b7d739105e32c3cdb400cffc68d2f2f8ae0c8e6f25747d63b6dc26994b3e"],"state_sha256":"ad68e84c8b2093537f52c6626730809ff7f812837965e310f95861bb709cffa6"}