{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2015:BUB724RVA24Z2MC6IBP4IRK4AM","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":"adc74815ad5601e307d47f032b31a64bb8b1d6bf4b1598bf6afec0c720e6af52","cross_cats_sorted":["math.IT"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2015-07-16T15:22:32Z","title_canon_sha256":"c4383e81546b757204526a452545c013e9bf7b6544dc585a7a8251a41e9eafef"},"schema_version":"1.0","source":{"id":"1507.04618","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1507.04618","created_at":"2026-05-18T01:24:32Z"},{"alias_kind":"arxiv_version","alias_value":"1507.04618v1","created_at":"2026-05-18T01:24:32Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1507.04618","created_at":"2026-05-18T01:24:32Z"},{"alias_kind":"pith_short_12","alias_value":"BUB724RVA24Z","created_at":"2026-05-18T12:29:14Z"},{"alias_kind":"pith_short_16","alias_value":"BUB724RVA24Z2MC6","created_at":"2026-05-18T12:29:14Z"},{"alias_kind":"pith_short_8","alias_value":"BUB724RV","created_at":"2026-05-18T12:29:14Z"}],"graph_snapshots":[{"event_id":"sha256:888dd2a001ec6c9eb80ec7f5edd95452b485c51c5f0118d278745d8a9e5df915","target":"graph","created_at":"2026-05-18T01:24:32Z","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":"Massive multiple-input multiple-output (MIMO) is becoming a key technology for future 5G wireless communications. Channel feedback for massive MIMO is challenging due to the substantially increased dimension of MIMO channel matrix. In this letter, we propose a compressive sensing (CS) based differential channel feedback scheme to reduce the feedback overhead. Specifically, the temporal correlation of time-varying channels is exploited to generate the differential channel impulse response (CIR) between two CIRs in neighboring time slots, which enjoys a much stronger sparsity than the original s","authors_text":"Linglong Dai, Wenqian Shen, Xudong Zhu, Yi Shi, Zhaocheng Wang","cross_cats":["math.IT"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2015-07-16T15:22:32Z","title":"Compressive sensing based differential channel feedback for massive MIMO"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1507.04618","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:b668ff12e6f788351e9a943cd928a656faf0a4016062d5355a21cede8b2e90e2","target":"record","created_at":"2026-05-18T01:24:32Z","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":"adc74815ad5601e307d47f032b31a64bb8b1d6bf4b1598bf6afec0c720e6af52","cross_cats_sorted":["math.IT"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2015-07-16T15:22:32Z","title_canon_sha256":"c4383e81546b757204526a452545c013e9bf7b6544dc585a7a8251a41e9eafef"},"schema_version":"1.0","source":{"id":"1507.04618","kind":"arxiv","version":1}},"canonical_sha256":"0d03fd723506b99d305e405fc4455c0312b951cbdded83c428fe11382e174d90","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"0d03fd723506b99d305e405fc4455c0312b951cbdded83c428fe11382e174d90","first_computed_at":"2026-05-18T01:24:32.904505Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:24:32.904505Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"dEsRZoW+DMwgO2dZA7Jmdd2EiO4aRtHBO3BjvGAZHXFEEy4hyfhBINa9iVdjmCnMXMHHBSryMnl5NqpzhaMcAw==","signature_status":"signed_v1","signed_at":"2026-05-18T01:24:32.905050Z","signed_message":"canonical_sha256_bytes"},"source_id":"1507.04618","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:b668ff12e6f788351e9a943cd928a656faf0a4016062d5355a21cede8b2e90e2","sha256:888dd2a001ec6c9eb80ec7f5edd95452b485c51c5f0118d278745d8a9e5df915"],"state_sha256":"88cccac0a5bbb1ef117c4510b728a6e12a78bb8d536c9e70078865c520719fb7"}