{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2017:R6VG6A7UGFN2KDCDABM5F5MWTJ","short_pith_number":"pith:R6VG6A7U","canonical_record":{"source":{"id":"1702.08703","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/publicdomain/zero/1.0/","primary_cat":"cs.IT","submitted_at":"2017-02-28T09:04:46Z","cross_cats_sorted":["math.IT"],"title_canon_sha256":"ee8fa57080550741a55f14164868222e3ab27d12c819cb10ec061c6a735ee2d0","abstract_canon_sha256":"efabf5ed41637684857c96ae1c28e9364f57a5b14dfd86f9569f485f1da3ee72"},"schema_version":"1.0"},"canonical_sha256":"8faa6f03f4315ba50c430059d2f5969a76e11edc286192d3ab52cfaae8664b9a","source":{"kind":"arxiv","id":"1702.08703","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1702.08703","created_at":"2026-05-18T00:49:48Z"},{"alias_kind":"arxiv_version","alias_value":"1702.08703v1","created_at":"2026-05-18T00:49:48Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1702.08703","created_at":"2026-05-18T00:49:48Z"},{"alias_kind":"pith_short_12","alias_value":"R6VG6A7UGFN2","created_at":"2026-05-18T12:31:39Z"},{"alias_kind":"pith_short_16","alias_value":"R6VG6A7UGFN2KDCD","created_at":"2026-05-18T12:31:39Z"},{"alias_kind":"pith_short_8","alias_value":"R6VG6A7U","created_at":"2026-05-18T12:31:39Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2017:R6VG6A7UGFN2KDCDABM5F5MWTJ","target":"record","payload":{"canonical_record":{"source":{"id":"1702.08703","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/publicdomain/zero/1.0/","primary_cat":"cs.IT","submitted_at":"2017-02-28T09:04:46Z","cross_cats_sorted":["math.IT"],"title_canon_sha256":"ee8fa57080550741a55f14164868222e3ab27d12c819cb10ec061c6a735ee2d0","abstract_canon_sha256":"efabf5ed41637684857c96ae1c28e9364f57a5b14dfd86f9569f485f1da3ee72"},"schema_version":"1.0"},"canonical_sha256":"8faa6f03f4315ba50c430059d2f5969a76e11edc286192d3ab52cfaae8664b9a","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:49:48.085825Z","signature_b64":"DIP3tl9LFG3Vw8p4VoSG2isrxaKvOkv4oCXofuRBfSuKn6xPETqFo3a1aJa+3rhSm8KcbdcgOztr0BIY62Y7AQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"8faa6f03f4315ba50c430059d2f5969a76e11edc286192d3ab52cfaae8664b9a","last_reissued_at":"2026-05-18T00:49:48.085176Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:49:48.085176Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1702.08703","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":"2026-05-18T00:49:48Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"djHdpKfljejPioxi1L9Jf8sgsLyFHBtlIk93Aq/ZlU4lOFKgQVFu/YnAbCdIbrz7kms4jz24XA2dbzoTHXXJAQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-25T19:13:53.118702Z"},"content_sha256":"5e755391e75e6149153968a1fc235bf8ed58fcda11aaf35f9941673ce1518f2d","schema_version":"1.0","event_id":"sha256:5e755391e75e6149153968a1fc235bf8ed58fcda11aaf35f9941673ce1518f2d"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2017:R6VG6A7UGFN2KDCDABM5F5MWTJ","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Widely-Linear Precoding for Large-Scale MIMO with IQI: Algorithms and Performance Analysis","license":"http://creativecommons.org/publicdomain/zero/1.0/","headline":"","cross_cats":["math.IT"],"primary_cat":"cs.IT","authors_text":"Bingyang Wu, Cunhua Pan, Jianxin Dai, Ming Chen, Rodrigo C. de Lamare, Wence Zhang, Xu Bao","submitted_at":"2017-02-28T09:04:46Z","abstract_excerpt":"In this paper we study widely-linear precoding techniques to mitigate in-phase/quadrature-phase (IQ) imbalance (IQI) in the downlink of large-scale multiple-input multiple-output (MIMO) systems. We adopt a real-valued signal model which takes into account the IQI at the transmitter and then develop widely-linear zero-forcing (WL-ZF), widely-linear matched filter (WL-MF), widely-linear minimum mean-squared error (WL-MMSE) and widely-linear block-diagonalization (WL-BD) type precoding algorithms for both {\\color{red} single- and multiple-antenna users.} We also present a performance analysis of "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1702.08703","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":"2026-05-18T00:49:48Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"2GOWy/yW3TLe7G30uWOPweildvmEJlaFZvSEHGA/akSDI4WRD3GYhNFpJZcu01irjoeV4n0pbmFmDQC9qxr2AA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-25T19:13:53.119407Z"},"content_sha256":"74a24e6a8eeee5cdf5f582b71da7a5876ed6179232c6f2b27ff1a230d9bb927d","schema_version":"1.0","event_id":"sha256:74a24e6a8eeee5cdf5f582b71da7a5876ed6179232c6f2b27ff1a230d9bb927d"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/R6VG6A7UGFN2KDCDABM5F5MWTJ/bundle.json","state_url":"https://pith.science/pith/R6VG6A7UGFN2KDCDABM5F5MWTJ/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/R6VG6A7UGFN2KDCDABM5F5MWTJ/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":"2026-05-25T19:13:53Z","links":{"resolver":"https://pith.science/pith/R6VG6A7UGFN2KDCDABM5F5MWTJ","bundle":"https://pith.science/pith/R6VG6A7UGFN2KDCDABM5F5MWTJ/bundle.json","state":"https://pith.science/pith/R6VG6A7UGFN2KDCDABM5F5MWTJ/state.json","well_known_bundle":"https://pith.science/.well-known/pith/R6VG6A7UGFN2KDCDABM5F5MWTJ/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2017:R6VG6A7UGFN2KDCDABM5F5MWTJ","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":"efabf5ed41637684857c96ae1c28e9364f57a5b14dfd86f9569f485f1da3ee72","cross_cats_sorted":["math.IT"],"license":"http://creativecommons.org/publicdomain/zero/1.0/","primary_cat":"cs.IT","submitted_at":"2017-02-28T09:04:46Z","title_canon_sha256":"ee8fa57080550741a55f14164868222e3ab27d12c819cb10ec061c6a735ee2d0"},"schema_version":"1.0","source":{"id":"1702.08703","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1702.08703","created_at":"2026-05-18T00:49:48Z"},{"alias_kind":"arxiv_version","alias_value":"1702.08703v1","created_at":"2026-05-18T00:49:48Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1702.08703","created_at":"2026-05-18T00:49:48Z"},{"alias_kind":"pith_short_12","alias_value":"R6VG6A7UGFN2","created_at":"2026-05-18T12:31:39Z"},{"alias_kind":"pith_short_16","alias_value":"R6VG6A7UGFN2KDCD","created_at":"2026-05-18T12:31:39Z"},{"alias_kind":"pith_short_8","alias_value":"R6VG6A7U","created_at":"2026-05-18T12:31:39Z"}],"graph_snapshots":[{"event_id":"sha256:74a24e6a8eeee5cdf5f582b71da7a5876ed6179232c6f2b27ff1a230d9bb927d","target":"graph","created_at":"2026-05-18T00:49:48Z","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 this paper we study widely-linear precoding techniques to mitigate in-phase/quadrature-phase (IQ) imbalance (IQI) in the downlink of large-scale multiple-input multiple-output (MIMO) systems. We adopt a real-valued signal model which takes into account the IQI at the transmitter and then develop widely-linear zero-forcing (WL-ZF), widely-linear matched filter (WL-MF), widely-linear minimum mean-squared error (WL-MMSE) and widely-linear block-diagonalization (WL-BD) type precoding algorithms for both {\\color{red} single- and multiple-antenna users.} We also present a performance analysis of ","authors_text":"Bingyang Wu, Cunhua Pan, Jianxin Dai, Ming Chen, Rodrigo C. de Lamare, Wence Zhang, Xu Bao","cross_cats":["math.IT"],"headline":"","license":"http://creativecommons.org/publicdomain/zero/1.0/","primary_cat":"cs.IT","submitted_at":"2017-02-28T09:04:46Z","title":"Widely-Linear Precoding for Large-Scale MIMO with IQI: Algorithms and Performance Analysis"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1702.08703","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":"sha256:5e755391e75e6149153968a1fc235bf8ed58fcda11aaf35f9941673ce1518f2d","target":"record","created_at":"2026-05-18T00:49:48Z","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":"efabf5ed41637684857c96ae1c28e9364f57a5b14dfd86f9569f485f1da3ee72","cross_cats_sorted":["math.IT"],"license":"http://creativecommons.org/publicdomain/zero/1.0/","primary_cat":"cs.IT","submitted_at":"2017-02-28T09:04:46Z","title_canon_sha256":"ee8fa57080550741a55f14164868222e3ab27d12c819cb10ec061c6a735ee2d0"},"schema_version":"1.0","source":{"id":"1702.08703","kind":"arxiv","version":1}},"canonical_sha256":"8faa6f03f4315ba50c430059d2f5969a76e11edc286192d3ab52cfaae8664b9a","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"8faa6f03f4315ba50c430059d2f5969a76e11edc286192d3ab52cfaae8664b9a","first_computed_at":"2026-05-18T00:49:48.085176Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:49:48.085176Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"DIP3tl9LFG3Vw8p4VoSG2isrxaKvOkv4oCXofuRBfSuKn6xPETqFo3a1aJa+3rhSm8KcbdcgOztr0BIY62Y7AQ==","signature_status":"signed_v1","signed_at":"2026-05-18T00:49:48.085825Z","signed_message":"canonical_sha256_bytes"},"source_id":"1702.08703","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:5e755391e75e6149153968a1fc235bf8ed58fcda11aaf35f9941673ce1518f2d","sha256:74a24e6a8eeee5cdf5f582b71da7a5876ed6179232c6f2b27ff1a230d9bb927d"],"state_sha256":"a607c9db2e6fb70b87d086390910f67fddac3b3ab6889daa3356199034b5e941"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"czk7NBqfLE2ZtLHKF5d/5uVRL/mymYzIrpFo/syjxh370T/l2MICwvjBvIcyb7A6Rt3VNV3V3Tcq1WdkyG3zCQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-25T19:13:53.123118Z","bundle_sha256":"d75d17fc00f5e426546794b6fd1da6ea9d13122adcc49cc5f9ed82d9a2f12c48"}}