{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2015:WTM4JDZEAT3CU2UDBP3TJ7WSBY","short_pith_number":"pith:WTM4JDZE","canonical_record":{"source":{"id":"1509.00202","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2015-09-01T09:56:05Z","cross_cats_sorted":["cs.LG","math.IT"],"title_canon_sha256":"04a0985be35c1b16d6b8cc56afa9bd0411db8e38bba7094b2810c766fef43062","abstract_canon_sha256":"91ffcf74d1ea97a24a9fddb7e4f125010aa566ccb0f69886bffcd7c973045442"},"schema_version":"1.0"},"canonical_sha256":"b4d9c48f2404f62a6a830bf734fed20e33a1ccbc2356fb4acce944ac6f3d35f3","source":{"kind":"arxiv","id":"1509.00202","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1509.00202","created_at":"2026-05-18T01:34:30Z"},{"alias_kind":"arxiv_version","alias_value":"1509.00202v1","created_at":"2026-05-18T01:34:30Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1509.00202","created_at":"2026-05-18T01:34:30Z"},{"alias_kind":"pith_short_12","alias_value":"WTM4JDZEAT3C","created_at":"2026-05-18T12:29:47Z"},{"alias_kind":"pith_short_16","alias_value":"WTM4JDZEAT3CU2UD","created_at":"2026-05-18T12:29:47Z"},{"alias_kind":"pith_short_8","alias_value":"WTM4JDZE","created_at":"2026-05-18T12:29:47Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2015:WTM4JDZEAT3CU2UDBP3TJ7WSBY","target":"record","payload":{"canonical_record":{"source":{"id":"1509.00202","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2015-09-01T09:56:05Z","cross_cats_sorted":["cs.LG","math.IT"],"title_canon_sha256":"04a0985be35c1b16d6b8cc56afa9bd0411db8e38bba7094b2810c766fef43062","abstract_canon_sha256":"91ffcf74d1ea97a24a9fddb7e4f125010aa566ccb0f69886bffcd7c973045442"},"schema_version":"1.0"},"canonical_sha256":"b4d9c48f2404f62a6a830bf734fed20e33a1ccbc2356fb4acce944ac6f3d35f3","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:34:30.382004Z","signature_b64":"KFZAGm5eXtgv/3korpJNuMm7UeIA5jslIfNwhL+l6YzQDhMavxscPqBU1YNLZdDdtGBdys5dBra6FIjHbfP8Cw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"b4d9c48f2404f62a6a830bf734fed20e33a1ccbc2356fb4acce944ac6f3d35f3","last_reissued_at":"2026-05-18T01:34:30.381338Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:34:30.381338Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1509.00202","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":"2026-05-18T01:34:30Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"dAs/eAsFHLHilZzV23yZ6qBLPEPDy/uAfjtyIqOiH0HWHO1fTWL3PRRhGfelRloo6L92yLC8H9eTdlmJR/4ZBw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-03T08:11:12.026861Z"},"content_sha256":"a17593cdf73b54f7e73a1ca163df2470557d11536c05035fa4a951ce2c480a0f","schema_version":"1.0","event_id":"sha256:a17593cdf73b54f7e73a1ca163df2470557d11536c05035fa4a951ce2c480a0f"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2015:WTM4JDZEAT3CU2UDBP3TJ7WSBY","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Fingerprinting-Based Positioning in Distributed Massive MIMO Systems","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["cs.LG","math.IT"],"primary_cat":"cs.IT","authors_text":"Erik G. Larsson, Vladimir Savic","submitted_at":"2015-09-01T09:56:05Z","abstract_excerpt":"Location awareness in wireless networks may enable many applications such as emergency services, autonomous driving and geographic routing. Although there are many available positioning techniques, none of them is adapted to work with massive multiple-in-multiple-out (MIMO) systems, which represent a leading 5G technology candidate. In this paper, we discuss possible solutions for positioning of mobile stations using a vector of signals at the base station, equipped with many antennas distributed over deployment area. Our main proposal is to use fingerprinting techniques based on a vector of r"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1509.00202","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":""},"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":"2026-05-18T01:34:30Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"w5uD/QM+FafdbudlOUP9dMjviWm+OupoUW/4/b83LOc3mcNoPSFbq5pGSFPdeS0eEPZK8+mGvCrJSkMGUWOeCg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-03T08:11:12.027200Z"},"content_sha256":"356d7cd4fa49d870f9e5d811a39d32781c4fd96fabac1956d93b90ed92d6c7ff","schema_version":"1.0","event_id":"sha256:356d7cd4fa49d870f9e5d811a39d32781c4fd96fabac1956d93b90ed92d6c7ff"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/WTM4JDZEAT3CU2UDBP3TJ7WSBY/bundle.json","state_url":"https://pith.science/pith/WTM4JDZEAT3CU2UDBP3TJ7WSBY/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/WTM4JDZEAT3CU2UDBP3TJ7WSBY/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":"2026-06-03T08:11:12Z","links":{"resolver":"https://pith.science/pith/WTM4JDZEAT3CU2UDBP3TJ7WSBY","bundle":"https://pith.science/pith/WTM4JDZEAT3CU2UDBP3TJ7WSBY/bundle.json","state":"https://pith.science/pith/WTM4JDZEAT3CU2UDBP3TJ7WSBY/state.json","well_known_bundle":"https://pith.science/.well-known/pith/WTM4JDZEAT3CU2UDBP3TJ7WSBY/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2015:WTM4JDZEAT3CU2UDBP3TJ7WSBY","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":"91ffcf74d1ea97a24a9fddb7e4f125010aa566ccb0f69886bffcd7c973045442","cross_cats_sorted":["cs.LG","math.IT"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2015-09-01T09:56:05Z","title_canon_sha256":"04a0985be35c1b16d6b8cc56afa9bd0411db8e38bba7094b2810c766fef43062"},"schema_version":"1.0","source":{"id":"1509.00202","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1509.00202","created_at":"2026-05-18T01:34:30Z"},{"alias_kind":"arxiv_version","alias_value":"1509.00202v1","created_at":"2026-05-18T01:34:30Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1509.00202","created_at":"2026-05-18T01:34:30Z"},{"alias_kind":"pith_short_12","alias_value":"WTM4JDZEAT3C","created_at":"2026-05-18T12:29:47Z"},{"alias_kind":"pith_short_16","alias_value":"WTM4JDZEAT3CU2UD","created_at":"2026-05-18T12:29:47Z"},{"alias_kind":"pith_short_8","alias_value":"WTM4JDZE","created_at":"2026-05-18T12:29:47Z"}],"graph_snapshots":[{"event_id":"sha256:356d7cd4fa49d870f9e5d811a39d32781c4fd96fabac1956d93b90ed92d6c7ff","target":"graph","created_at":"2026-05-18T01:34:30Z","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":"Location awareness in wireless networks may enable many applications such as emergency services, autonomous driving and geographic routing. Although there are many available positioning techniques, none of them is adapted to work with massive multiple-in-multiple-out (MIMO) systems, which represent a leading 5G technology candidate. In this paper, we discuss possible solutions for positioning of mobile stations using a vector of signals at the base station, equipped with many antennas distributed over deployment area. Our main proposal is to use fingerprinting techniques based on a vector of r","authors_text":"Erik G. Larsson, Vladimir Savic","cross_cats":["cs.LG","math.IT"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2015-09-01T09:56:05Z","title":"Fingerprinting-Based Positioning in Distributed Massive MIMO Systems"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1509.00202","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:a17593cdf73b54f7e73a1ca163df2470557d11536c05035fa4a951ce2c480a0f","target":"record","created_at":"2026-05-18T01:34:30Z","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":"91ffcf74d1ea97a24a9fddb7e4f125010aa566ccb0f69886bffcd7c973045442","cross_cats_sorted":["cs.LG","math.IT"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2015-09-01T09:56:05Z","title_canon_sha256":"04a0985be35c1b16d6b8cc56afa9bd0411db8e38bba7094b2810c766fef43062"},"schema_version":"1.0","source":{"id":"1509.00202","kind":"arxiv","version":1}},"canonical_sha256":"b4d9c48f2404f62a6a830bf734fed20e33a1ccbc2356fb4acce944ac6f3d35f3","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"b4d9c48f2404f62a6a830bf734fed20e33a1ccbc2356fb4acce944ac6f3d35f3","first_computed_at":"2026-05-18T01:34:30.381338Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:34:30.381338Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"KFZAGm5eXtgv/3korpJNuMm7UeIA5jslIfNwhL+l6YzQDhMavxscPqBU1YNLZdDdtGBdys5dBra6FIjHbfP8Cw==","signature_status":"signed_v1","signed_at":"2026-05-18T01:34:30.382004Z","signed_message":"canonical_sha256_bytes"},"source_id":"1509.00202","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:a17593cdf73b54f7e73a1ca163df2470557d11536c05035fa4a951ce2c480a0f","sha256:356d7cd4fa49d870f9e5d811a39d32781c4fd96fabac1956d93b90ed92d6c7ff"],"state_sha256":"2c3f66f9b648d36e11d5cf43877f92bb6c5862089c1988d22f2d6fe503f178ad"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"h/xiZD0KdaR/FoTfqucafFaqHL/Omk/Otd3xKu8kCGEjW2Ab2zCsCJJ+SsbFGRBpkTMCTcvphNvh3nTXxoHXCg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-03T08:11:12.029152Z","bundle_sha256":"d279dd81684dd686ed293b9d45fc54e00f909af84777e9b459ecfbbac7369e9c"}}