{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2016:LFEDTXHLVIEAU5ICYKCWIHNGLV","short_pith_number":"pith:LFEDTXHL","canonical_record":{"source":{"id":"1610.00647","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2016-10-03T17:54:01Z","cross_cats_sorted":["math.IT"],"title_canon_sha256":"b87c9640239fdfc519def252e462a20d43c9a906e7c2cefb923285f91bb76e4a","abstract_canon_sha256":"4a0357dfc50796dca17e032a4a20de97445d4d8f86d918b0274b051bacc5a952"},"schema_version":"1.0"},"canonical_sha256":"594839dcebaa080a7502c285641da65d4dab444c0b8127e42fff0ae301d34045","source":{"kind":"arxiv","id":"1610.00647","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1610.00647","created_at":"2026-05-18T00:58:56Z"},{"alias_kind":"arxiv_version","alias_value":"1610.00647v1","created_at":"2026-05-18T00:58:56Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1610.00647","created_at":"2026-05-18T00:58:56Z"},{"alias_kind":"pith_short_12","alias_value":"LFEDTXHLVIEA","created_at":"2026-05-18T12:30:29Z"},{"alias_kind":"pith_short_16","alias_value":"LFEDTXHLVIEAU5IC","created_at":"2026-05-18T12:30:29Z"},{"alias_kind":"pith_short_8","alias_value":"LFEDTXHL","created_at":"2026-05-18T12:30:29Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2016:LFEDTXHLVIEAU5ICYKCWIHNGLV","target":"record","payload":{"canonical_record":{"source":{"id":"1610.00647","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2016-10-03T17:54:01Z","cross_cats_sorted":["math.IT"],"title_canon_sha256":"b87c9640239fdfc519def252e462a20d43c9a906e7c2cefb923285f91bb76e4a","abstract_canon_sha256":"4a0357dfc50796dca17e032a4a20de97445d4d8f86d918b0274b051bacc5a952"},"schema_version":"1.0"},"canonical_sha256":"594839dcebaa080a7502c285641da65d4dab444c0b8127e42fff0ae301d34045","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:58:56.497950Z","signature_b64":"iwwhhTwM3Wfk0TqjTGrX2P2Qh6AZSrVlWS/RZqQRM7NiBYQybTe/I9zscGeXXfc7nvHFXhzdpWccxJojmRwGAQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"594839dcebaa080a7502c285641da65d4dab444c0b8127e42fff0ae301d34045","last_reissued_at":"2026-05-18T00:58:56.497353Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:58:56.497353Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1610.00647","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":"2026-05-18T00:58:56Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"4NESDLAWloFo1MZkXRgJdR0oKs1jpjbwWh8dRnECH7Vd674zUQVFL6+pp/IAUoiIQCFWbOzB+CE2Cr7VAWXTDA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-30T07:47:12.209004Z"},"content_sha256":"b637608a24d70889b17dde9c1bedf2735ed8eca6c0df70df6ab53022fd44a1a1","schema_version":"1.0","event_id":"sha256:b637608a24d70889b17dde9c1bedf2735ed8eca6c0df70df6ab53022fd44a1a1"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2016:LFEDTXHLVIEAU5ICYKCWIHNGLV","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Secure Massive MIMO Systems with Limited RF Chains","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["math.IT"],"primary_cat":"cs.IT","authors_text":"Jun Zhu, Ning Wang, Wei Xu","submitted_at":"2016-10-03T17:54:01Z","abstract_excerpt":"In future practical deployments of massive multi-input multi-output (MIMO) systems, the number of radio frequency (RF) chains at the base stations (BSs) may be much smaller than the number of BS antennas to reduce the overall expenditure. In this paper, we propose a novel design framework for joint data and artificial noise (AN) precoding in a multiuser massive MIMO system with limited number of RF chains, which improves the wireless security performance. With imperfect channel state information (CSI), we analytically derive an achievable lower bound on the ergodic secrecy rate of any mobile t"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1610.00647","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":"2026-05-18T00:58:56Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"YVswTa+vC93e+eQkBM/JFNlN/C10UoYHkPTfFmfHQjkP8b39+GkcMqXLyaFkcHGlMjs0+7arRuoUq4g5E6tFBA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-30T07:47:12.209375Z"},"content_sha256":"760e3ce400006290318169ec04d72206d39c857883456fe713fa5e44c303221f","schema_version":"1.0","event_id":"sha256:760e3ce400006290318169ec04d72206d39c857883456fe713fa5e44c303221f"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/LFEDTXHLVIEAU5ICYKCWIHNGLV/bundle.json","state_url":"https://pith.science/pith/LFEDTXHLVIEAU5ICYKCWIHNGLV/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/LFEDTXHLVIEAU5ICYKCWIHNGLV/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":"2026-05-30T07:47:12Z","links":{"resolver":"https://pith.science/pith/LFEDTXHLVIEAU5ICYKCWIHNGLV","bundle":"https://pith.science/pith/LFEDTXHLVIEAU5ICYKCWIHNGLV/bundle.json","state":"https://pith.science/pith/LFEDTXHLVIEAU5ICYKCWIHNGLV/state.json","well_known_bundle":"https://pith.science/.well-known/pith/LFEDTXHLVIEAU5ICYKCWIHNGLV/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2016:LFEDTXHLVIEAU5ICYKCWIHNGLV","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":"4a0357dfc50796dca17e032a4a20de97445d4d8f86d918b0274b051bacc5a952","cross_cats_sorted":["math.IT"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2016-10-03T17:54:01Z","title_canon_sha256":"b87c9640239fdfc519def252e462a20d43c9a906e7c2cefb923285f91bb76e4a"},"schema_version":"1.0","source":{"id":"1610.00647","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1610.00647","created_at":"2026-05-18T00:58:56Z"},{"alias_kind":"arxiv_version","alias_value":"1610.00647v1","created_at":"2026-05-18T00:58:56Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1610.00647","created_at":"2026-05-18T00:58:56Z"},{"alias_kind":"pith_short_12","alias_value":"LFEDTXHLVIEA","created_at":"2026-05-18T12:30:29Z"},{"alias_kind":"pith_short_16","alias_value":"LFEDTXHLVIEAU5IC","created_at":"2026-05-18T12:30:29Z"},{"alias_kind":"pith_short_8","alias_value":"LFEDTXHL","created_at":"2026-05-18T12:30:29Z"}],"graph_snapshots":[{"event_id":"sha256:760e3ce400006290318169ec04d72206d39c857883456fe713fa5e44c303221f","target":"graph","created_at":"2026-05-18T00:58:56Z","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":"In future practical deployments of massive multi-input multi-output (MIMO) systems, the number of radio frequency (RF) chains at the base stations (BSs) may be much smaller than the number of BS antennas to reduce the overall expenditure. In this paper, we propose a novel design framework for joint data and artificial noise (AN) precoding in a multiuser massive MIMO system with limited number of RF chains, which improves the wireless security performance. With imperfect channel state information (CSI), we analytically derive an achievable lower bound on the ergodic secrecy rate of any mobile t","authors_text":"Jun Zhu, Ning Wang, Wei Xu","cross_cats":["math.IT"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2016-10-03T17:54:01Z","title":"Secure Massive MIMO Systems with Limited RF Chains"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1610.00647","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:b637608a24d70889b17dde9c1bedf2735ed8eca6c0df70df6ab53022fd44a1a1","target":"record","created_at":"2026-05-18T00:58:56Z","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":"4a0357dfc50796dca17e032a4a20de97445d4d8f86d918b0274b051bacc5a952","cross_cats_sorted":["math.IT"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2016-10-03T17:54:01Z","title_canon_sha256":"b87c9640239fdfc519def252e462a20d43c9a906e7c2cefb923285f91bb76e4a"},"schema_version":"1.0","source":{"id":"1610.00647","kind":"arxiv","version":1}},"canonical_sha256":"594839dcebaa080a7502c285641da65d4dab444c0b8127e42fff0ae301d34045","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"594839dcebaa080a7502c285641da65d4dab444c0b8127e42fff0ae301d34045","first_computed_at":"2026-05-18T00:58:56.497353Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:58:56.497353Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"iwwhhTwM3Wfk0TqjTGrX2P2Qh6AZSrVlWS/RZqQRM7NiBYQybTe/I9zscGeXXfc7nvHFXhzdpWccxJojmRwGAQ==","signature_status":"signed_v1","signed_at":"2026-05-18T00:58:56.497950Z","signed_message":"canonical_sha256_bytes"},"source_id":"1610.00647","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:b637608a24d70889b17dde9c1bedf2735ed8eca6c0df70df6ab53022fd44a1a1","sha256:760e3ce400006290318169ec04d72206d39c857883456fe713fa5e44c303221f"],"state_sha256":"c886a7187b82a03c6c151baebcb9c8b6253a5c1019117bf0431e2e2e0cea456e"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"1gbfOYWzgtrqhl58rnkmagWahLngzFt7Vc5T29GD3cK/I1oFq+umUKmY5PQbHFOkaPbCpgRvoHsRGe4cxXTVCw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-30T07:47:12.211430Z","bundle_sha256":"b2b050e6ac17fddc5d6eeb2885958d76cb35c7941876db2c923061d2dbc60b38"}}