{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:3ZJLNKQXK7VF6NJXITCNXEHD5Z","short_pith_number":"pith:3ZJLNKQX","canonical_record":{"source":{"id":"1810.04126","kind":"arxiv","version":4},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SP","submitted_at":"2018-10-08T05:40:04Z","cross_cats_sorted":[],"title_canon_sha256":"e72d7b2fc22c0072cae3547b8d18e26970479cd3edf316fe9885d95ab2238325","abstract_canon_sha256":"e201c0244a90976960c25dfe374c5e239169f55d5665ad40806354856794ba17"},"schema_version":"1.0"},"canonical_sha256":"de52b6aa1757ea5f353744c4db90e3ee5c11032a85f44aee790edfe76fb515ca","source":{"kind":"arxiv","id":"1810.04126","version":4},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1810.04126","created_at":"2026-05-17T23:54:31Z"},{"alias_kind":"arxiv_version","alias_value":"1810.04126v4","created_at":"2026-05-17T23:54:31Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1810.04126","created_at":"2026-05-17T23:54:31Z"},{"alias_kind":"pith_short_12","alias_value":"3ZJLNKQXK7VF","created_at":"2026-05-18T12:32:05Z"},{"alias_kind":"pith_short_16","alias_value":"3ZJLNKQXK7VF6NJX","created_at":"2026-05-18T12:32:05Z"},{"alias_kind":"pith_short_8","alias_value":"3ZJLNKQX","created_at":"2026-05-18T12:32:05Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:3ZJLNKQXK7VF6NJXITCNXEHD5Z","target":"record","payload":{"canonical_record":{"source":{"id":"1810.04126","kind":"arxiv","version":4},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SP","submitted_at":"2018-10-08T05:40:04Z","cross_cats_sorted":[],"title_canon_sha256":"e72d7b2fc22c0072cae3547b8d18e26970479cd3edf316fe9885d95ab2238325","abstract_canon_sha256":"e201c0244a90976960c25dfe374c5e239169f55d5665ad40806354856794ba17"},"schema_version":"1.0"},"canonical_sha256":"de52b6aa1757ea5f353744c4db90e3ee5c11032a85f44aee790edfe76fb515ca","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-17T23:54:31.552158Z","signature_b64":"dy1sKJ0hga1wmr9CIu7BZWloExFAgq0YrDGgXpmjDWCo7HrFx4+UKPrifo9Svk8bybAeg5onYLN73WRGgulEAg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"de52b6aa1757ea5f353744c4db90e3ee5c11032a85f44aee790edfe76fb515ca","last_reissued_at":"2026-05-17T23:54:31.551667Z","signature_status":"signed_v1","first_computed_at":"2026-05-17T23:54:31.551667Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1810.04126","source_version":4,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-17T23:54:31Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"snlBDAHab9Vmz4irDxTj5B1BQ7kFJlBPNm1RuJZQZ/zo2gjFPGtYcHyJ0XDuLu5n3ilvsRUHGCntncec9ck1Bw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-02T10:05:59.282583Z"},"content_sha256":"a6160901e827b8af06623fdff214cb925f8807d699da41c669ba942938899b1d","schema_version":"1.0","event_id":"sha256:a6160901e827b8af06623fdff214cb925f8807d699da41c669ba942938899b1d"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:3ZJLNKQXK7VF6NJXITCNXEHD5Z","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Novel Massive MIMO Channel Sounding Data Applied to Deep Learning-based Indoor Positioning","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"eess.SP","authors_text":"Jakob Hoydis, Maximilian Arnold, Stephan ten Brink","submitted_at":"2018-10-08T05:40:04Z","abstract_excerpt":"With a significant increase in area throughput, Massive MIMO has become an enabling technology for fifth generation (5G) wireless mobile communication systems. Although prototypes were built, an openly available dataset for channel impulse responses to verify assumptions, e.g. regarding channel sparsity, is not yet available. In this paper, we introduce a novel channel sounder architecture, capable of measuring multiantenna and multi-subcarrier channel state information (CSI) at different frequency bands, antenna geometries and propagation environments. The channel sounder has been verified by"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1810.04126","kind":"arxiv","version":4},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"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":"2026-05-17T23:54:31Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"6EmRTGAzS9NmYZ/IPwNDo+SjrRYOp79srl3FpiJ0HWCn/3++OgrZwGrGiyai/uqjkWLc+xawpHnxQndQCV0bDA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-02T10:05:59.282932Z"},"content_sha256":"c7bf6ab82a57dcc29d5e93c71017a1f9b6b594aee95531292262693613931763","schema_version":"1.0","event_id":"sha256:c7bf6ab82a57dcc29d5e93c71017a1f9b6b594aee95531292262693613931763"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/3ZJLNKQXK7VF6NJXITCNXEHD5Z/bundle.json","state_url":"https://pith.science/pith/3ZJLNKQXK7VF6NJXITCNXEHD5Z/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/3ZJLNKQXK7VF6NJXITCNXEHD5Z/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":"2026-06-02T10:05:59Z","links":{"resolver":"https://pith.science/pith/3ZJLNKQXK7VF6NJXITCNXEHD5Z","bundle":"https://pith.science/pith/3ZJLNKQXK7VF6NJXITCNXEHD5Z/bundle.json","state":"https://pith.science/pith/3ZJLNKQXK7VF6NJXITCNXEHD5Z/state.json","well_known_bundle":"https://pith.science/.well-known/pith/3ZJLNKQXK7VF6NJXITCNXEHD5Z/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:3ZJLNKQXK7VF6NJXITCNXEHD5Z","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":"e201c0244a90976960c25dfe374c5e239169f55d5665ad40806354856794ba17","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SP","submitted_at":"2018-10-08T05:40:04Z","title_canon_sha256":"e72d7b2fc22c0072cae3547b8d18e26970479cd3edf316fe9885d95ab2238325"},"schema_version":"1.0","source":{"id":"1810.04126","kind":"arxiv","version":4}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1810.04126","created_at":"2026-05-17T23:54:31Z"},{"alias_kind":"arxiv_version","alias_value":"1810.04126v4","created_at":"2026-05-17T23:54:31Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1810.04126","created_at":"2026-05-17T23:54:31Z"},{"alias_kind":"pith_short_12","alias_value":"3ZJLNKQXK7VF","created_at":"2026-05-18T12:32:05Z"},{"alias_kind":"pith_short_16","alias_value":"3ZJLNKQXK7VF6NJX","created_at":"2026-05-18T12:32:05Z"},{"alias_kind":"pith_short_8","alias_value":"3ZJLNKQX","created_at":"2026-05-18T12:32:05Z"}],"graph_snapshots":[{"event_id":"sha256:c7bf6ab82a57dcc29d5e93c71017a1f9b6b594aee95531292262693613931763","target":"graph","created_at":"2026-05-17T23:54:31Z","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"},"paper":{"abstract_excerpt":"With a significant increase in area throughput, Massive MIMO has become an enabling technology for fifth generation (5G) wireless mobile communication systems. Although prototypes were built, an openly available dataset for channel impulse responses to verify assumptions, e.g. regarding channel sparsity, is not yet available. In this paper, we introduce a novel channel sounder architecture, capable of measuring multiantenna and multi-subcarrier channel state information (CSI) at different frequency bands, antenna geometries and propagation environments. The channel sounder has been verified by","authors_text":"Jakob Hoydis, Maximilian Arnold, Stephan ten Brink","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SP","submitted_at":"2018-10-08T05:40:04Z","title":"Novel Massive MIMO Channel Sounding Data Applied to Deep Learning-based Indoor Positioning"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1810.04126","kind":"arxiv","version":4},"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:a6160901e827b8af06623fdff214cb925f8807d699da41c669ba942938899b1d","target":"record","created_at":"2026-05-17T23:54:31Z","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":"e201c0244a90976960c25dfe374c5e239169f55d5665ad40806354856794ba17","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SP","submitted_at":"2018-10-08T05:40:04Z","title_canon_sha256":"e72d7b2fc22c0072cae3547b8d18e26970479cd3edf316fe9885d95ab2238325"},"schema_version":"1.0","source":{"id":"1810.04126","kind":"arxiv","version":4}},"canonical_sha256":"de52b6aa1757ea5f353744c4db90e3ee5c11032a85f44aee790edfe76fb515ca","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"de52b6aa1757ea5f353744c4db90e3ee5c11032a85f44aee790edfe76fb515ca","first_computed_at":"2026-05-17T23:54:31.551667Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-17T23:54:31.551667Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"dy1sKJ0hga1wmr9CIu7BZWloExFAgq0YrDGgXpmjDWCo7HrFx4+UKPrifo9Svk8bybAeg5onYLN73WRGgulEAg==","signature_status":"signed_v1","signed_at":"2026-05-17T23:54:31.552158Z","signed_message":"canonical_sha256_bytes"},"source_id":"1810.04126","source_kind":"arxiv","source_version":4}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:a6160901e827b8af06623fdff214cb925f8807d699da41c669ba942938899b1d","sha256:c7bf6ab82a57dcc29d5e93c71017a1f9b6b594aee95531292262693613931763"],"state_sha256":"5e3c1524e5ea3d8aa2642afaec20f78abf1778b4ae5556d75e4901e0ce5fa6d4"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"G1nAhvS+6WTl11cBkT+NnisAvt24revdgV2h+PjQV2JGiXtJs5QZMYLNFMtPP1eg9cK36gAlctB8aJq3uHMoAg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-02T10:05:59.284886Z","bundle_sha256":"92acf1f6b17ac9b13201087e63c84f24ef8e6a3a31a85d6ab2db015713e8a312"}}