{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2023:AWMHZCYAT6ZY2SVBIO7KJX2FIK","short_pith_number":"pith:AWMHZCYA","canonical_record":{"source":{"id":"2301.04641","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2023-01-11T18:52:25Z","cross_cats_sorted":["eess.SP","math.IT"],"title_canon_sha256":"20d4ac5d818c9a425824cdd4230ec81a711f363c658be6d76311b0f783b93f55","abstract_canon_sha256":"b3ba0626891183411ad9c598da2e6805199c27235a17f55ca4a32f64498e52e6"},"schema_version":"1.0"},"canonical_sha256":"05987c8b009fb38d4aa143bea4df4542b17aaadecde8dbdc7f911a5c669de4c6","source":{"kind":"arxiv","id":"2301.04641","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2301.04641","created_at":"2026-07-05T07:36:49Z"},{"alias_kind":"arxiv_version","alias_value":"2301.04641v2","created_at":"2026-07-05T07:36:49Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2301.04641","created_at":"2026-07-05T07:36:49Z"},{"alias_kind":"pith_short_12","alias_value":"AWMHZCYAT6ZY","created_at":"2026-07-05T07:36:49Z"},{"alias_kind":"pith_short_16","alias_value":"AWMHZCYAT6ZY2SVB","created_at":"2026-07-05T07:36:49Z"},{"alias_kind":"pith_short_8","alias_value":"AWMHZCYA","created_at":"2026-07-05T07:36:49Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2023:AWMHZCYAT6ZY2SVBIO7KJX2FIK","target":"record","payload":{"canonical_record":{"source":{"id":"2301.04641","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2023-01-11T18:52:25Z","cross_cats_sorted":["eess.SP","math.IT"],"title_canon_sha256":"20d4ac5d818c9a425824cdd4230ec81a711f363c658be6d76311b0f783b93f55","abstract_canon_sha256":"b3ba0626891183411ad9c598da2e6805199c27235a17f55ca4a32f64498e52e6"},"schema_version":"1.0"},"canonical_sha256":"05987c8b009fb38d4aa143bea4df4542b17aaadecde8dbdc7f911a5c669de4c6","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T07:36:49.925893Z","signature_b64":"Vt+4E2QvIpzI/cQVUc1dGatbSfZ8fdlj2dsj75oTe5W1eT9srwz42joLtAd1eeaytJxLgJmc6O3iL493lfbfDQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"05987c8b009fb38d4aa143bea4df4542b17aaadecde8dbdc7f911a5c669de4c6","last_reissued_at":"2026-07-05T07:36:49.925392Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T07:36:49.925392Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2301.04641","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-05T07:36:49Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"1JJWaehNgnJU+7zQVFX0AfN6lvTUZXZokL4CQX8Dn/vOEg1Gv9ZEZeIbR3nIjOuljm8DjiySz8UNVMSY58HeDA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-05T05:09:21.231577Z"},"content_sha256":"cd2b24685ec958d83e8dc62eba350d03215185592d352e90f0c2963dd4cad8d7","schema_version":"1.0","event_id":"sha256:cd2b24685ec958d83e8dc62eba350d03215185592d352e90f0c2963dd4cad8d7"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2023:AWMHZCYAT6ZY2SVBIO7KJX2FIK","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Plug-in Channel Estimation with Dithered Quantized Signals in Spatially Non-Stationary Massive MIMO Systems","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["eess.SP","math.IT"],"primary_cat":"cs.IT","authors_text":"Giuseppe Caire, Johannes Maly, Sjoerd Dirksen, Tianyu Yang","submitted_at":"2023-01-11T18:52:25Z","abstract_excerpt":"As the array dimension of massive MIMO systems increases to unprecedented levels, two problems occur. First, the spatial stationarity assumption along the antenna elements is no longer valid. Second, the large array size results in an unacceptably high power consumption if high-resolution analog-to-digital converters are used. To address these two challenges, we consider a Bussgang linear minimum mean square error (BLMMSE)-based channel estimator for large scale massive MIMO systems with one-bit quantizers and a spatially non-stationary channel. Whereas other works usually assume that the chan"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2301.04641","kind":"arxiv","version":2},"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/2301.04641/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":"2026-07-05T07:36:49Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"zv7YZzzLWH0eJvbi1XMTWPKUPzU2IA7XK/pFlVud8344THZugVVj1SiudmO3xnXT0jg5ziZtH1tAaBAreEfhCw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-05T05:09:21.232565Z"},"content_sha256":"d34f32037545c6e619ee08735b9f5b696c486f06229510b271aefe8270b45382","schema_version":"1.0","event_id":"sha256:d34f32037545c6e619ee08735b9f5b696c486f06229510b271aefe8270b45382"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/AWMHZCYAT6ZY2SVBIO7KJX2FIK/bundle.json","state_url":"https://pith.science/pith/AWMHZCYAT6ZY2SVBIO7KJX2FIK/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/AWMHZCYAT6ZY2SVBIO7KJX2FIK/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":"2026-08-05T05:09:21Z","links":{"resolver":"https://pith.science/pith/AWMHZCYAT6ZY2SVBIO7KJX2FIK","bundle":"https://pith.science/pith/AWMHZCYAT6ZY2SVBIO7KJX2FIK/bundle.json","state":"https://pith.science/pith/AWMHZCYAT6ZY2SVBIO7KJX2FIK/state.json","well_known_bundle":"https://pith.science/.well-known/pith/AWMHZCYAT6ZY2SVBIO7KJX2FIK/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2023:AWMHZCYAT6ZY2SVBIO7KJX2FIK","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":"b3ba0626891183411ad9c598da2e6805199c27235a17f55ca4a32f64498e52e6","cross_cats_sorted":["eess.SP","math.IT"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2023-01-11T18:52:25Z","title_canon_sha256":"20d4ac5d818c9a425824cdd4230ec81a711f363c658be6d76311b0f783b93f55"},"schema_version":"1.0","source":{"id":"2301.04641","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2301.04641","created_at":"2026-07-05T07:36:49Z"},{"alias_kind":"arxiv_version","alias_value":"2301.04641v2","created_at":"2026-07-05T07:36:49Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2301.04641","created_at":"2026-07-05T07:36:49Z"},{"alias_kind":"pith_short_12","alias_value":"AWMHZCYAT6ZY","created_at":"2026-07-05T07:36:49Z"},{"alias_kind":"pith_short_16","alias_value":"AWMHZCYAT6ZY2SVB","created_at":"2026-07-05T07:36:49Z"},{"alias_kind":"pith_short_8","alias_value":"AWMHZCYA","created_at":"2026-07-05T07:36:49Z"}],"graph_snapshots":[{"event_id":"sha256:d34f32037545c6e619ee08735b9f5b696c486f06229510b271aefe8270b45382","target":"graph","created_at":"2026-07-05T07:36:49Z","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/2301.04641/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"As the array dimension of massive MIMO systems increases to unprecedented levels, two problems occur. First, the spatial stationarity assumption along the antenna elements is no longer valid. Second, the large array size results in an unacceptably high power consumption if high-resolution analog-to-digital converters are used. To address these two challenges, we consider a Bussgang linear minimum mean square error (BLMMSE)-based channel estimator for large scale massive MIMO systems with one-bit quantizers and a spatially non-stationary channel. Whereas other works usually assume that the chan","authors_text":"Giuseppe Caire, Johannes Maly, Sjoerd Dirksen, Tianyu Yang","cross_cats":["eess.SP","math.IT"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2023-01-11T18:52:25Z","title":"Plug-in Channel Estimation with Dithered Quantized Signals in Spatially Non-Stationary Massive MIMO Systems"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2301.04641","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:cd2b24685ec958d83e8dc62eba350d03215185592d352e90f0c2963dd4cad8d7","target":"record","created_at":"2026-07-05T07:36:49Z","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":"b3ba0626891183411ad9c598da2e6805199c27235a17f55ca4a32f64498e52e6","cross_cats_sorted":["eess.SP","math.IT"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2023-01-11T18:52:25Z","title_canon_sha256":"20d4ac5d818c9a425824cdd4230ec81a711f363c658be6d76311b0f783b93f55"},"schema_version":"1.0","source":{"id":"2301.04641","kind":"arxiv","version":2}},"canonical_sha256":"05987c8b009fb38d4aa143bea4df4542b17aaadecde8dbdc7f911a5c669de4c6","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"05987c8b009fb38d4aa143bea4df4542b17aaadecde8dbdc7f911a5c669de4c6","first_computed_at":"2026-07-05T07:36:49.925392Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T07:36:49.925392Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"Vt+4E2QvIpzI/cQVUc1dGatbSfZ8fdlj2dsj75oTe5W1eT9srwz42joLtAd1eeaytJxLgJmc6O3iL493lfbfDQ==","signature_status":"signed_v1","signed_at":"2026-07-05T07:36:49.925893Z","signed_message":"canonical_sha256_bytes"},"source_id":"2301.04641","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:cd2b24685ec958d83e8dc62eba350d03215185592d352e90f0c2963dd4cad8d7","sha256:d34f32037545c6e619ee08735b9f5b696c486f06229510b271aefe8270b45382"],"state_sha256":"68b837d520e2dbcba513f2b37618975817feef33d2a301e27f8f9cdf2f6d4a54"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"jsFCkddkXjTTKQ3DCYbjLEgKttkdtH1GgwCOO6tfBWaH0dwLLVCwM3OJCXtHH/goVvnj5IniB371ebELTPmDCQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-05T05:09:21.238414Z","bundle_sha256":"6db2383007e3b43517a96696f29e72b08aec533047fdc9ebc9f4a4af45d9259b"}}