{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2020:IHHPJPVWFQDUUSCPEBFXPJ6WNE","short_pith_number":"pith:IHHPJPVW","canonical_record":{"source":{"id":"2006.00899","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2020-06-01T12:51:34Z","cross_cats_sorted":["eess.SP","math.IT"],"title_canon_sha256":"8818063ea1e21c56d3e71a55e55e9a7e1973dd5236b009f545c4c90bae4431a4","abstract_canon_sha256":"2a8760fc7a9f154dc6ed21fbe4d308a51efccb6109d2f60d98a510fe3b437aac"},"schema_version":"1.0"},"canonical_sha256":"41cef4beb62c074a484f204b77a7d6690a84d1aab4b56bb633e78b738345da07","source":{"kind":"arxiv","id":"2006.00899","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2006.00899","created_at":"2026-07-05T01:07:32Z"},{"alias_kind":"arxiv_version","alias_value":"2006.00899v1","created_at":"2026-07-05T01:07:32Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2006.00899","created_at":"2026-07-05T01:07:32Z"},{"alias_kind":"pith_short_12","alias_value":"IHHPJPVWFQDU","created_at":"2026-07-05T01:07:32Z"},{"alias_kind":"pith_short_16","alias_value":"IHHPJPVWFQDUUSCP","created_at":"2026-07-05T01:07:32Z"},{"alias_kind":"pith_short_8","alias_value":"IHHPJPVW","created_at":"2026-07-05T01:07:32Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2020:IHHPJPVWFQDUUSCPEBFXPJ6WNE","target":"record","payload":{"canonical_record":{"source":{"id":"2006.00899","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2020-06-01T12:51:34Z","cross_cats_sorted":["eess.SP","math.IT"],"title_canon_sha256":"8818063ea1e21c56d3e71a55e55e9a7e1973dd5236b009f545c4c90bae4431a4","abstract_canon_sha256":"2a8760fc7a9f154dc6ed21fbe4d308a51efccb6109d2f60d98a510fe3b437aac"},"schema_version":"1.0"},"canonical_sha256":"41cef4beb62c074a484f204b77a7d6690a84d1aab4b56bb633e78b738345da07","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T01:07:32.409169Z","signature_b64":"tgop4ryXm88dHc5J9GXhqvG4WceIJMr9yHcKLK9mbIYUYl2/EtYbdb7JsRbEZARWUwTFdimP5apktegec0DqCQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"41cef4beb62c074a484f204b77a7d6690a84d1aab4b56bb633e78b738345da07","last_reissued_at":"2026-07-05T01:07:32.408753Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T01:07:32.408753Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2006.00899","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":"2026-07-05T01:07:32Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"f+0kwTwaqvW8EKwd/GmDPtgVlejvhyjTcXDCq782mZcti806fUorTOqQvZvV8c/WT9exs+qZVy7qgo5yMBtVDA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-18T15:57:24.956411Z"},"content_sha256":"0e0f7c4ace00f7153de84ce147a9139869e123f2b119505dc307183e1e8e293f","schema_version":"1.0","event_id":"sha256:0e0f7c4ace00f7153de84ce147a9139869e123f2b119505dc307183e1e8e293f"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2020:IHHPJPVWFQDUUSCPEBFXPJ6WNE","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Analog Versus Hybrid Precoding for Multiuser Massive MIMO with Quantized CSI Feedback","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["eess.SP","math.IT"],"primary_cat":"cs.IT","authors_text":"Jindan Xu, Kezhi Wang, Mohamed-Slim Alouini, Shi Jin, Wei Xu, Yaqiong Zhao","submitted_at":"2020-06-01T12:51:34Z","abstract_excerpt":"In this letter, we study the performance of a downlink multiuser massive multiple-input multiple-output (MIMO) system with sub-connected structure over limited feedback channels. Tight rate approximations are theoretically analyzed for the system with pure analog precoding and hybrid precoding. The effect of quantized analog and digital precoding is characterized in the derived expressions. Furthermore, it is revealed that the pure analog precoding outperforms the hybrid precoding using maximal-ratio transmission (MRT) or zero forcing (ZF) under certain conditions, and we theoretically charact"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2006.00899","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2006.00899/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":"2026-07-05T01:07:32Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"nMhtX8b8cU+pHPVCiYsUoL4Q4fueBDc3OOpKyH3awJpYsFkt77pr6dvReDwY5wipHjxoOZGkL3Ptbuio0DdmCQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-18T15:57:24.956808Z"},"content_sha256":"b29039deeed9b5af241cab48eab1bc7ea3ee40c28619ada72f8613e2ed2ce367","schema_version":"1.0","event_id":"sha256:b29039deeed9b5af241cab48eab1bc7ea3ee40c28619ada72f8613e2ed2ce367"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/IHHPJPVWFQDUUSCPEBFXPJ6WNE/bundle.json","state_url":"https://pith.science/pith/IHHPJPVWFQDUUSCPEBFXPJ6WNE/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/IHHPJPVWFQDUUSCPEBFXPJ6WNE/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":"2026-07-18T15:57:24Z","links":{"resolver":"https://pith.science/pith/IHHPJPVWFQDUUSCPEBFXPJ6WNE","bundle":"https://pith.science/pith/IHHPJPVWFQDUUSCPEBFXPJ6WNE/bundle.json","state":"https://pith.science/pith/IHHPJPVWFQDUUSCPEBFXPJ6WNE/state.json","well_known_bundle":"https://pith.science/.well-known/pith/IHHPJPVWFQDUUSCPEBFXPJ6WNE/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2020:IHHPJPVWFQDUUSCPEBFXPJ6WNE","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":"2a8760fc7a9f154dc6ed21fbe4d308a51efccb6109d2f60d98a510fe3b437aac","cross_cats_sorted":["eess.SP","math.IT"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2020-06-01T12:51:34Z","title_canon_sha256":"8818063ea1e21c56d3e71a55e55e9a7e1973dd5236b009f545c4c90bae4431a4"},"schema_version":"1.0","source":{"id":"2006.00899","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2006.00899","created_at":"2026-07-05T01:07:32Z"},{"alias_kind":"arxiv_version","alias_value":"2006.00899v1","created_at":"2026-07-05T01:07:32Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2006.00899","created_at":"2026-07-05T01:07:32Z"},{"alias_kind":"pith_short_12","alias_value":"IHHPJPVWFQDU","created_at":"2026-07-05T01:07:32Z"},{"alias_kind":"pith_short_16","alias_value":"IHHPJPVWFQDUUSCP","created_at":"2026-07-05T01:07:32Z"},{"alias_kind":"pith_short_8","alias_value":"IHHPJPVW","created_at":"2026-07-05T01:07:32Z"}],"graph_snapshots":[{"event_id":"sha256:b29039deeed9b5af241cab48eab1bc7ea3ee40c28619ada72f8613e2ed2ce367","target":"graph","created_at":"2026-07-05T01:07:32Z","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"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/2006.00899/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"In this letter, we study the performance of a downlink multiuser massive multiple-input multiple-output (MIMO) system with sub-connected structure over limited feedback channels. Tight rate approximations are theoretically analyzed for the system with pure analog precoding and hybrid precoding. The effect of quantized analog and digital precoding is characterized in the derived expressions. Furthermore, it is revealed that the pure analog precoding outperforms the hybrid precoding using maximal-ratio transmission (MRT) or zero forcing (ZF) under certain conditions, and we theoretically charact","authors_text":"Jindan Xu, Kezhi Wang, Mohamed-Slim Alouini, Shi Jin, Wei Xu, Yaqiong Zhao","cross_cats":["eess.SP","math.IT"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2020-06-01T12:51:34Z","title":"Analog Versus Hybrid Precoding for Multiuser Massive MIMO with Quantized CSI Feedback"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2006.00899","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":"sha256:0e0f7c4ace00f7153de84ce147a9139869e123f2b119505dc307183e1e8e293f","target":"record","created_at":"2026-07-05T01:07:32Z","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":"2a8760fc7a9f154dc6ed21fbe4d308a51efccb6109d2f60d98a510fe3b437aac","cross_cats_sorted":["eess.SP","math.IT"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2020-06-01T12:51:34Z","title_canon_sha256":"8818063ea1e21c56d3e71a55e55e9a7e1973dd5236b009f545c4c90bae4431a4"},"schema_version":"1.0","source":{"id":"2006.00899","kind":"arxiv","version":1}},"canonical_sha256":"41cef4beb62c074a484f204b77a7d6690a84d1aab4b56bb633e78b738345da07","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"41cef4beb62c074a484f204b77a7d6690a84d1aab4b56bb633e78b738345da07","first_computed_at":"2026-07-05T01:07:32.408753Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T01:07:32.408753Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"tgop4ryXm88dHc5J9GXhqvG4WceIJMr9yHcKLK9mbIYUYl2/EtYbdb7JsRbEZARWUwTFdimP5apktegec0DqCQ==","signature_status":"signed_v1","signed_at":"2026-07-05T01:07:32.409169Z","signed_message":"canonical_sha256_bytes"},"source_id":"2006.00899","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:0e0f7c4ace00f7153de84ce147a9139869e123f2b119505dc307183e1e8e293f","sha256:b29039deeed9b5af241cab48eab1bc7ea3ee40c28619ada72f8613e2ed2ce367"],"state_sha256":"190eb60a680bd05a136ed9ea6a5a043b11be4981a1b5a9c2d062a2b754d269b1"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"yab2WmP+VmBUkWps27555D+qVODpIdchaAIZ5qoADFSjYVc3U8Rf9eFOej4gSjUwgJRk00QwbQsUM1X7weMNAA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-07-18T15:57:24.959341Z","bundle_sha256":"6b90a991d4174f1e99b4a5c23158e1b59741d7ba24e7b3c1fcf6946d45aed33e"}}