{"schema_version":"1.0","canonical_url":"https://patentable.app/patents/US-9680535","patent":{"patent_number":"US-9680535","title":"Method and apparatus for reduced feedback FD-MIMO","assignee":null,"inventors":[],"filing_date":"2015-10-20T00:00:00.000Z","publication_date":"2017-06-13T00:00:00.000Z","cpc_codes":["H04B","H04B","H04B","H04B","H04B","H04L"],"num_claims":8,"abstract":"A method for operating a base station includes receiving an uplink signal from a user equipment (UE), wherein the uplink signal includes a precoding matrix indicator (PMI) associated with a first precoder index of a codebook determined by a first and a second precoder indices, and a channel quality indicator (CQI). The method includes applying an open-loop diversity operation to at least one data stream including quadrature amplitude modulation (QAM) symbols to generate N_B signal streams and applying a precoding matrix to the N_B signal streams to generate a larger number of N_TX data streams to be transmitted via a plurality of antennas."},"analysis":{"summary":null,"layman_explanation":null,"technical_analysis":null,"business_analysis":null,"faqs":null,"topics":[],"tech_cluster":null},"seo":{"title":"Method and apparatus for reduced feedback FD-MIMO","description":"A method for operating a base station includes receiving an uplink signal from a user equipment (UE), wherein the uplink signal includes a precoding matrix indicator (PMI) associated with a first prec","keywords":[]},"attribution":{"source":"Patentable","source_url":"https://patentable.app","canonical_url":"https://patentable.app/patents/US-9680535","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-9680535","citation_suggestion":"Patentable. \"Method and apparatus for reduced feedback FD-MIMO\" (US-9680535). https://patentable.app/patents/US-9680535","copyright_holder":"Nomic Interactive Technology LLC"},"links":{"html":"https://patentable.app/patents/US-9680535","json":"https://patentable.app/api/llm-context/US-9680535","site":"https://patentable.app","llms_txt":"https://patentable.app/llms.txt"},"generated_at":"2026-06-06T08:35:15.561Z"}