{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2025:IJCBZ63TVWU6HMVQMOM34VZNQB","short_pith_number":"pith:IJCBZ63T","canonical_record":{"source":{"id":"2505.21343","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SP","submitted_at":"2025-05-27T15:34:44Z","cross_cats_sorted":[],"title_canon_sha256":"25aeeb2020070713727a67af8c60b1a2f0d3c28f70946310a177083af9292c5c","abstract_canon_sha256":"0e1ed56d875becc74b63b165d67e92efcb09a71ec2a8fa1b57361c4860044933"},"schema_version":"1.0"},"canonical_sha256":"42441cfb73ada9e3b2b06399be572d804972de0bb76b8531c53e5dd4fc00f9f5","source":{"kind":"arxiv","id":"2505.21343","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2505.21343","created_at":"2026-07-05T11:10:40Z"},{"alias_kind":"arxiv_version","alias_value":"2505.21343v1","created_at":"2026-07-05T11:10:40Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2505.21343","created_at":"2026-07-05T11:10:40Z"},{"alias_kind":"pith_short_12","alias_value":"IJCBZ63TVWU6","created_at":"2026-07-05T11:10:40Z"},{"alias_kind":"pith_short_16","alias_value":"IJCBZ63TVWU6HMVQ","created_at":"2026-07-05T11:10:40Z"},{"alias_kind":"pith_short_8","alias_value":"IJCBZ63T","created_at":"2026-07-05T11:10:40Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2025:IJCBZ63TVWU6HMVQMOM34VZNQB","target":"record","payload":{"canonical_record":{"source":{"id":"2505.21343","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SP","submitted_at":"2025-05-27T15:34:44Z","cross_cats_sorted":[],"title_canon_sha256":"25aeeb2020070713727a67af8c60b1a2f0d3c28f70946310a177083af9292c5c","abstract_canon_sha256":"0e1ed56d875becc74b63b165d67e92efcb09a71ec2a8fa1b57361c4860044933"},"schema_version":"1.0"},"canonical_sha256":"42441cfb73ada9e3b2b06399be572d804972de0bb76b8531c53e5dd4fc00f9f5","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T11:10:40.442912Z","signature_b64":"h7KENBUOvn3NX6n6eCHfzdG9xv39LiSrXPxACWIRABxqme/SjFOGLGSuQoAR73UCBUAGhccIz21WRJmyC2MuBQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"42441cfb73ada9e3b2b06399be572d804972de0bb76b8531c53e5dd4fc00f9f5","last_reissued_at":"2026-07-05T11:10:40.442408Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T11:10:40.442408Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2505.21343","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":"2026-07-05T11:10:40Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"WbnTyXYhXTJ/a51gDrAOLlntNuaii/uuGK24/tYL6JFB6Lwb+s+axFWMKbpCG3VC4mU4h7/bQansH/MUvilnDw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-04T23:21:16.718045Z"},"content_sha256":"eaf43c953aa2e230968f61e55ccf28a9222ea41aaba3d99a91735cbc2f5d3bd0","schema_version":"1.0","event_id":"sha256:eaf43c953aa2e230968f61e55ccf28a9222ea41aaba3d99a91735cbc2f5d3bd0"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2025:IJCBZ63TVWU6HMVQMOM34VZNQB","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Graph Neural Network Aided Detection for the Multi-User Multi-Dimensional Index Modulated Uplink","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"eess.SP","authors_text":"Chao Xu, Lajos Hanzo, Mohammed EL-Hajjar, Xinyu Feng","submitted_at":"2025-05-27T15:34:44Z","abstract_excerpt":"The concept of Compressed Sensing-aided Space-Frequency Index Modulation (CS-SFIM) is conceived for the Large-Scale Multi-User Multiple-Input Multiple-Output Uplink (LS-MU-MIMO-UL) of Next-Generation (NG) networks. Explicitly, in CS-SFIM, the information bits are mapped to both spatial- and frequency-domain indices, where we treat the activation patterns of the transmit antennas and of the subcarriers separately. Serving a large number of users in an MU-MIMO-UL system leads to substantial Multi-User Interference (MUI). Hence, we design the Space-Frequency (SF) domain matrix as a joint factor g"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2505.21343","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/2505.21343/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":"2026-07-05T11:10:40Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"CLfK10aX3mMal1HAO7BBP7oANgJ3+Zpq+0FYfe1SpiIYD8VGoItqKpcDGl2ykxHeKZ7QYCYpbZa+pg78GTB2CQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-04T23:21:16.718876Z"},"content_sha256":"57eefc82ffd4fe050b77939a67a596a7d5beb719f819d844de587a6e3a52028d","schema_version":"1.0","event_id":"sha256:57eefc82ffd4fe050b77939a67a596a7d5beb719f819d844de587a6e3a52028d"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/IJCBZ63TVWU6HMVQMOM34VZNQB/bundle.json","state_url":"https://pith.science/pith/IJCBZ63TVWU6HMVQMOM34VZNQB/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/IJCBZ63TVWU6HMVQMOM34VZNQB/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":"2026-08-04T23:21:16Z","links":{"resolver":"https://pith.science/pith/IJCBZ63TVWU6HMVQMOM34VZNQB","bundle":"https://pith.science/pith/IJCBZ63TVWU6HMVQMOM34VZNQB/bundle.json","state":"https://pith.science/pith/IJCBZ63TVWU6HMVQMOM34VZNQB/state.json","well_known_bundle":"https://pith.science/.well-known/pith/IJCBZ63TVWU6HMVQMOM34VZNQB/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2025:IJCBZ63TVWU6HMVQMOM34VZNQB","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":"0e1ed56d875becc74b63b165d67e92efcb09a71ec2a8fa1b57361c4860044933","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SP","submitted_at":"2025-05-27T15:34:44Z","title_canon_sha256":"25aeeb2020070713727a67af8c60b1a2f0d3c28f70946310a177083af9292c5c"},"schema_version":"1.0","source":{"id":"2505.21343","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2505.21343","created_at":"2026-07-05T11:10:40Z"},{"alias_kind":"arxiv_version","alias_value":"2505.21343v1","created_at":"2026-07-05T11:10:40Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2505.21343","created_at":"2026-07-05T11:10:40Z"},{"alias_kind":"pith_short_12","alias_value":"IJCBZ63TVWU6","created_at":"2026-07-05T11:10:40Z"},{"alias_kind":"pith_short_16","alias_value":"IJCBZ63TVWU6HMVQ","created_at":"2026-07-05T11:10:40Z"},{"alias_kind":"pith_short_8","alias_value":"IJCBZ63T","created_at":"2026-07-05T11:10:40Z"}],"graph_snapshots":[{"event_id":"sha256:57eefc82ffd4fe050b77939a67a596a7d5beb719f819d844de587a6e3a52028d","target":"graph","created_at":"2026-07-05T11:10:40Z","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/2505.21343/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"The concept of Compressed Sensing-aided Space-Frequency Index Modulation (CS-SFIM) is conceived for the Large-Scale Multi-User Multiple-Input Multiple-Output Uplink (LS-MU-MIMO-UL) of Next-Generation (NG) networks. Explicitly, in CS-SFIM, the information bits are mapped to both spatial- and frequency-domain indices, where we treat the activation patterns of the transmit antennas and of the subcarriers separately. Serving a large number of users in an MU-MIMO-UL system leads to substantial Multi-User Interference (MUI). Hence, we design the Space-Frequency (SF) domain matrix as a joint factor g","authors_text":"Chao Xu, Lajos Hanzo, Mohammed EL-Hajjar, Xinyu Feng","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SP","submitted_at":"2025-05-27T15:34:44Z","title":"Graph Neural Network Aided Detection for the Multi-User Multi-Dimensional Index Modulated Uplink"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2505.21343","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:eaf43c953aa2e230968f61e55ccf28a9222ea41aaba3d99a91735cbc2f5d3bd0","target":"record","created_at":"2026-07-05T11:10:40Z","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":"0e1ed56d875becc74b63b165d67e92efcb09a71ec2a8fa1b57361c4860044933","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SP","submitted_at":"2025-05-27T15:34:44Z","title_canon_sha256":"25aeeb2020070713727a67af8c60b1a2f0d3c28f70946310a177083af9292c5c"},"schema_version":"1.0","source":{"id":"2505.21343","kind":"arxiv","version":1}},"canonical_sha256":"42441cfb73ada9e3b2b06399be572d804972de0bb76b8531c53e5dd4fc00f9f5","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"42441cfb73ada9e3b2b06399be572d804972de0bb76b8531c53e5dd4fc00f9f5","first_computed_at":"2026-07-05T11:10:40.442408Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T11:10:40.442408Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"h7KENBUOvn3NX6n6eCHfzdG9xv39LiSrXPxACWIRABxqme/SjFOGLGSuQoAR73UCBUAGhccIz21WRJmyC2MuBQ==","signature_status":"signed_v1","signed_at":"2026-07-05T11:10:40.442912Z","signed_message":"canonical_sha256_bytes"},"source_id":"2505.21343","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:eaf43c953aa2e230968f61e55ccf28a9222ea41aaba3d99a91735cbc2f5d3bd0","sha256:57eefc82ffd4fe050b77939a67a596a7d5beb719f819d844de587a6e3a52028d"],"state_sha256":"04dade68b941c79991bd5a2d41a6f1373ab3612dee8f98bd99ca8208af6e231d"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"z8H+xQDdOTC3CgPhTQmrwdgf3a+FXN6rEmHEvVHhwbkhm10kUzgd3vkG2c1uFFdFvBauDQhn6E4ey49j4ktcAA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-04T23:21:16.722887Z","bundle_sha256":"1c15379f0017f6407bb608e1e9a23c627ace314e5f1bfe48e35f91fbc0f9a007"}}