{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2017:56PHXLDFMCVQOQJS7RT5ZU325N","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":"473e3fcb255b7c379513e0ec5890a0b796977ec23166e46cd05f97d56797e3ff","cross_cats_sorted":["math.IT"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2017-12-27T16:30:03Z","title_canon_sha256":"11285c6ef148fb4af9cd5181fb95c198371e01bf4e4bbaa1224bf1d8392998d7"},"schema_version":"1.0","source":{"id":"1712.09612","kind":"arxiv","version":3}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1712.09612","created_at":"2026-05-18T00:12:48Z"},{"alias_kind":"arxiv_version","alias_value":"1712.09612v3","created_at":"2026-05-18T00:12:48Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1712.09612","created_at":"2026-05-18T00:12:48Z"},{"alias_kind":"pith_short_12","alias_value":"56PHXLDFMCVQ","created_at":"2026-05-18T12:31:00Z"},{"alias_kind":"pith_short_16","alias_value":"56PHXLDFMCVQOQJS","created_at":"2026-05-18T12:31:00Z"},{"alias_kind":"pith_short_8","alias_value":"56PHXLDF","created_at":"2026-05-18T12:31:00Z"}],"graph_snapshots":[{"event_id":"sha256:c83a618bb3536dcc79169e388d6f4774b26c68f636d2913efa945c399d1552af","target":"graph","created_at":"2026-05-18T00:12:48Z","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 massive MIMO base stations, power consumption and cost of the low-noise amplifiers (LNAs) can be substantial because of the many antennas. We investigate the feasibility of inexpensive, power efficient LNAs, which inherently are less linear. A polynomial model is used to characterize the nonlinear LNAs and to derive the second-order statistics and spatial correlation of the distortion. We show that, with spatial matched filtering (maximum-ratio combining) at the receiver, some distortion terms combine coherently, and that the SINR of the symbol estimates therefore is limited by the linearit","authors_text":"Christopher Moll\\'en, Erik G. Larsson, Thomas Eriksson, Ulf Gustavsson","cross_cats":["math.IT"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2017-12-27T16:30:03Z","title":"Impact of Spatial Filtering on Distortion from Low-Noise Amplifiers in Massive MIMO Base Stations"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1712.09612","kind":"arxiv","version":3},"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:d70762312e4d60268481e3bbf5e855d2cf63010e6743ae7d45339c12b520c319","target":"record","created_at":"2026-05-18T00:12:48Z","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":"473e3fcb255b7c379513e0ec5890a0b796977ec23166e46cd05f97d56797e3ff","cross_cats_sorted":["math.IT"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2017-12-27T16:30:03Z","title_canon_sha256":"11285c6ef148fb4af9cd5181fb95c198371e01bf4e4bbaa1224bf1d8392998d7"},"schema_version":"1.0","source":{"id":"1712.09612","kind":"arxiv","version":3}},"canonical_sha256":"ef9e7bac6560ab074132fc67dcd37aeb550399a6befeeb934e618aff80c6c066","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"ef9e7bac6560ab074132fc67dcd37aeb550399a6befeeb934e618aff80c6c066","first_computed_at":"2026-05-18T00:12:48.469822Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:12:48.469822Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"Ub0TDev+jumkNUpizBFrjxhK3TOymEdVYrwkAkr+9eDBlcPlhbxV0BLw7ZsoUlX9zyEzm7bpuRpW9HePEOgABg==","signature_status":"signed_v1","signed_at":"2026-05-18T00:12:48.470347Z","signed_message":"canonical_sha256_bytes"},"source_id":"1712.09612","source_kind":"arxiv","source_version":3}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:d70762312e4d60268481e3bbf5e855d2cf63010e6743ae7d45339c12b520c319","sha256:c83a618bb3536dcc79169e388d6f4774b26c68f636d2913efa945c399d1552af"],"state_sha256":"f171628b5a26351007c1e727a1515ed48c0cb404552f5386bfcf98139fd0fd1a"}