{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2015:3R7ODECT4WXCKVF5YEQK5FDRIW","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":"457fdabde0978ea2b9ec0098c6251e90d9ec21a3ef7346bf49b9a048178bdcd7","cross_cats_sorted":["math.IT"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2015-09-26T00:24:10Z","title_canon_sha256":"b1b0c180d3baa4d439ceb18d9ef759fb7768c78e3dafae690accf77cbac5eff7"},"schema_version":"1.0","source":{"id":"1509.07928","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1509.07928","created_at":"2026-05-18T01:16:34Z"},{"alias_kind":"arxiv_version","alias_value":"1509.07928v2","created_at":"2026-05-18T01:16:34Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1509.07928","created_at":"2026-05-18T01:16:34Z"},{"alias_kind":"pith_short_12","alias_value":"3R7ODECT4WXC","created_at":"2026-05-18T12:29:02Z"},{"alias_kind":"pith_short_16","alias_value":"3R7ODECT4WXCKVF5","created_at":"2026-05-18T12:29:02Z"},{"alias_kind":"pith_short_8","alias_value":"3R7ODECT","created_at":"2026-05-18T12:29:02Z"}],"graph_snapshots":[{"event_id":"sha256:548d479fa9e91df77e8430d23f71eeba8be0a04e8acf82dc37152e188354ebae","target":"graph","created_at":"2026-05-18T01:16:34Z","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":"Coarse quantization at the base station (BS) of a massive multi-user (MU) multiple-input multiple-output (MIMO) wireless system promises significant power and cost savings. Coarse quantization also enables significant reductions of the raw analog-to-digital converter (ADC) data that must be transferred from a spatially-separated antenna array to the baseband processing unit. The theoretical limits as well as practical transceiver algorithms for such quantized MU-MIMO systems operating over frequency-flat, narrowband channels have been studied extensively. However, the practically relevant scen","authors_text":"Christoph Studer, Giuseppe Durisi","cross_cats":["math.IT"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2015-09-26T00:24:10Z","title":"Quantized Massive MU-MIMO-OFDM Uplink"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1509.07928","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":"sha256:4be93928aa7fa5627a02c2e1653965b35fc9d87eea55f9c4b5a6414931250e9f","target":"record","created_at":"2026-05-18T01:16:34Z","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":"457fdabde0978ea2b9ec0098c6251e90d9ec21a3ef7346bf49b9a048178bdcd7","cross_cats_sorted":["math.IT"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2015-09-26T00:24:10Z","title_canon_sha256":"b1b0c180d3baa4d439ceb18d9ef759fb7768c78e3dafae690accf77cbac5eff7"},"schema_version":"1.0","source":{"id":"1509.07928","kind":"arxiv","version":2}},"canonical_sha256":"dc7ee19053e5ae2554bdc120ae9471458bc13e6d2e86c09c9e98077ccdf0bc85","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"dc7ee19053e5ae2554bdc120ae9471458bc13e6d2e86c09c9e98077ccdf0bc85","first_computed_at":"2026-05-18T01:16:34.930334Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:16:34.930334Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"gNb6o9BkV2D7If09fb2kvH1YviO8YyOiU7FRWvLyHd12Ogxid9l4Vo11lWPTzSFnQQPmk25Q8wlj1PDQ7KIOCg==","signature_status":"signed_v1","signed_at":"2026-05-18T01:16:34.930981Z","signed_message":"canonical_sha256_bytes"},"source_id":"1509.07928","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:4be93928aa7fa5627a02c2e1653965b35fc9d87eea55f9c4b5a6414931250e9f","sha256:548d479fa9e91df77e8430d23f71eeba8be0a04e8acf82dc37152e188354ebae"],"state_sha256":"90687a58a1a56492bd40d43765da86a647ad23605d2448651b00139b456cb27d"}