{"schema_version":"1.0","canonical_url":"https://patentable.app/patents/US-9806779","patent":{"patent_number":"US-9806779","title":"Signal transmission method and apparatus using codebook in wireless communication system supporting multiple antennas","assignee":null,"inventors":[],"filing_date":"2016-04-20T00:00:00.000Z","publication_date":"2017-10-31T00:00:00.000Z","cpc_codes":["H04L","H04B","H04B","H04B","H04B","H04B","H04B","H04L","H04L","H04L","H04L","H04W","H04W","H04B","H04W","H04W"],"num_claims":12,"abstract":"The present invention relates to a method for transmitting, by a base station, a downlink signal using a plurality of transmission antennas comprises the steps of: applying a precoding matrix indicated by the PMI, received from a terminal, in a codebook to a plurality of layers, and transmitting the precoded signal to the terminal through a plurality of transmission antennas. Among precoding matrices included in the codebook, a precoding matrix for even number transmission layers can be a 2×2 matrix containing four matrices (W1s), the matrix (W1) having rows of a number of transmission antennas and columns of half the number of transmission layers, the first and second columns of the first row in the 2×2 matrix being multiplied by 1, the first column of the second row being multiplied by coefficient “a” of a phase, and the first column of the second row being multiplied by “−a”."},"analysis":{"summary":null,"layman_explanation":null,"technical_analysis":null,"business_analysis":null,"faqs":null,"topics":[],"tech_cluster":null},"seo":{"title":"Signal transmission method and apparatus using codebook in wireless communication system supporting multiple antennas","description":"The present invention relates to a method for transmitting, by a base station, a downlink signal using a plurality of transmission antennas comprises the steps of: applying a precoding matrix indicate","keywords":[]},"attribution":{"source":"Patentable","source_url":"https://patentable.app","canonical_url":"https://patentable.app/patents/US-9806779","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-9806779","citation_suggestion":"Patentable. \"Signal transmission method and apparatus using codebook in wireless communication system supporting multiple antennas\" (US-9806779). https://patentable.app/patents/US-9806779","copyright_holder":"Nomic Interactive Technology LLC"},"links":{"html":"https://patentable.app/patents/US-9806779","json":"https://patentable.app/api/llm-context/US-9806779","site":"https://patentable.app","llms_txt":"https://patentable.app/llms.txt"},"generated_at":"2026-06-06T06:07:49.837Z"}