{"work":{"id":"accfc41c-6a40-4e9b-9607-c14eb34f2952","openalex_id":null,"doi":null,"arxiv_id":null,"raw_key":"raw:67676124d7845f51f710a456","title":"Channel estimation for extremely large-scale MIMO: Far-field or near-field?","authors":null,"authors_text":"M","year":2022,"venue":null,"abstract":null,"external_url":null,"cited_by_count":null,"metadata_source":"raw_reference","metadata_fetched_at":"2026-05-23T11:47:55.721753+00:00","pith_arxiv_id":null,"created_at":"2026-05-16T01:10:29.603398+00:00","updated_at":"2026-05-23T11:47:55.721753+00:00","title_quality_ok":true,"display_title":null,"render_title":"Channel estimation for extremely large-scale MIMO: Far-field or near-field?"},"hub":{"state":{"work_id":"accfc41c-6a40-4e9b-9607-c14eb34f2952","tier":"hub","tier_reason":"10+ Pith inbound or 1,000+ external citations","pith_inbound_count":12,"external_cited_by_count":null,"distinct_field_count":2,"first_pith_cited_at":"2025-12-25T13:00:00+00:00","last_pith_cited_at":"2026-05-07T04:13:13+00:00","author_build_status":"not_needed","summary_status":"needed","contexts_status":"needed","graph_status":"needed","ask_index_status":"not_needed","reader_status":"not_needed","recognition_status":"not_needed","updated_at":"2026-06-05T11:38:50.273669+00:00","tier_text":"hub"},"tier":"hub","role_counts":[],"polarity_counts":[],"runs":{},"summary":{},"graph":{},"authors":[]}}