{"schema_version":"1.0","canonical_url":"https://patentable.app/patents/US-9621244","patent":{"patent_number":"US-9621244","title":"Method and apparatus for quantizing channel state information","assignee":null,"inventors":[],"filing_date":"2013-04-07T00:00:00.000Z","publication_date":"2017-04-11T00:00:00.000Z","cpc_codes":["H04B","H04B","H04B","H04B","H04B","H04B"],"num_claims":14,"abstract":"The present invention relates to a method and an apparatus for quantizing channel state information (CSI). An embodiment of the present invention provides a method for providing codeword index information to a base station configured with Nt directional antennas, including: determining a first codeword in a first codebook whose rank is r, where r=1, 2, . . . , Nt, and sending an index of the codeword to the base station; and determining a second codeword in a second codebook whose rank is r, and sending an index of the codeword to the base station. The first codeword is a block diagonal matrix, and a matrix on a diagonal block of the block diagonal matrix is a matrix with Nt/2 rows and Nb columns. The Nb columns are Nb different Discrete Fourier Transform (DFT) vectors arbitrarily selected from N predefined DFT vectors, N is an integer power of 2, 1≦Nb≦N, and the length of each DFT vector is Nt. Each column corresponding to each data stream in the second codeword includes an equal-length column selection vector for individually selecting from the Nb columns in the first codeword the DFT vectors used in two polarization directions and co-phasing information θ=2πm/M between the two polarization directions, where M is an integer power of 2, and 0≦m≦M−1."},"analysis":{"summary":null,"layman_explanation":null,"technical_analysis":null,"business_analysis":null,"faqs":null,"topics":[],"tech_cluster":null},"seo":{"title":"Method and apparatus for quantizing channel state information","description":"The present invention relates to a method and an apparatus for quantizing channel state information (CSI). An embodiment of the present invention provides a method for providing codeword index informa","keywords":[]},"attribution":{"source":"Patentable","source_url":"https://patentable.app","canonical_url":"https://patentable.app/patents/US-9621244","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-9621244","citation_suggestion":"Patentable. \"Method and apparatus for quantizing channel state information\" (US-9621244). https://patentable.app/patents/US-9621244","copyright_holder":"Nomic Interactive Technology LLC"},"links":{"html":"https://patentable.app/patents/US-9621244","json":"https://patentable.app/api/llm-context/US-9621244","site":"https://patentable.app","llms_txt":"https://patentable.app/llms.txt"},"generated_at":"2026-06-06T06:10:55.506Z"}