{"schema_version":"1.0","canonical_url":"https://patentable.app/patents/US-8537921","patent":{"patent_number":"US-8537921","title":"Apparatuses and methods for transmission and reception in a codebook based closed-loop (CL)-multiple input multiple output (MIMO) system","assignee":null,"inventors":[],"filing_date":"2009-04-24T00:00:00.000Z","publication_date":"2013-09-17T00:00:00.000Z","cpc_codes":["H04B","H04B","H04B","H04B"],"num_claims":15,"abstract":"Apparatuses and methods for transmission and reception in a Closed-Loop (CL)-Multiple Input Multiple Output (MIMO) system are provided. A codebook generation method includes determining weight vectors vi (i=1, . . . , 2L) for a codebook V(4, 1, L), where Nt of a codebook V(Nt, s, L) denotes a number of antennas, s denotes a number of streams, and L denotes a number of codebook index bits, determining a unitary matrix Ti using an i-th vector vi of the codebook V(4, 1, L), and determining an i-th matrix of the codebook V(4, 2, L) by selecting a first column of the unitary matrix Ti as a first column of a weight matrix and selecting a column selected from other columns excluding the first column of the unitary matrix Ti in a particular pattern, as a second column of the weight matrix."},"analysis":{"summary":null,"layman_explanation":null,"technical_analysis":null,"business_analysis":null,"faqs":null,"topics":[],"tech_cluster":null},"seo":{"title":"Apparatuses and methods for transmission and reception in a codebook based closed-loop (CL)-multiple input multiple output (MIMO) system","description":"Apparatuses and methods for transmission and reception in a Closed-Loop (CL)-Multiple Input Multiple Output (MIMO) system are provided. A codebook generation method includes determining weight vectors","keywords":[]},"attribution":{"source":"Patentable","source_url":"https://patentable.app","canonical_url":"https://patentable.app/patents/US-8537921","license":"CC-BY-4.0-like","license_terms":"AI-generated analysis on this page (summary, layman_explanation, technical_analysis, business_analysis, faqs) may be reused with attribution and a visible link back to the canonical URL above. Patent abstracts, claims, and bibliographic data are USPTO public domain.","required_link":"https://patentable.app/patents/US-8537921","citation_suggestion":"Patentable. \"Apparatuses and methods for transmission and reception in a codebook based closed-loop (CL)-multiple input multiple output (MIMO) system\" (US-8537921). https://patentable.app/patents/US-8537921","copyright_holder":"Nomic Interactive Technology LLC"},"links":{"html":"https://patentable.app/patents/US-8537921","json":"https://patentable.app/api/llm-context/US-8537921","site":"https://patentable.app","llms_txt":"https://patentable.app/llms.txt"},"generated_at":"2026-05-30T23:05:12.654Z"}