{"schema_version":"1.0","canonical_url":"https://patentable.app/patents/US-9628231","patent":{"patent_number":"US-9628231","title":"Spreading and precoding in OFDM","assignee":null,"inventors":[],"filing_date":"2016-05-09T00:00:00.000Z","publication_date":"2017-04-18T00:00:00.000Z","cpc_codes":["H04L","H04B","H04B","H04B","H04B","H04B","H04B","H04J","H04J","H04J","H04J","H04L","H04L","H04L","H04L","H04L","H04L","H04L","H04W","H04W","H04B","H04B","H04L","H04L","H04L","H04L","H04L","H04L","H04W","H04W","H04W"],"num_claims":26,"abstract":"An OFDM transmitter spreads original data symbols with a complex-valued spreading matrix derived from a discrete Fourier transform. Spread data symbols are mapped to OFDM subcarriers. Spreading and mapping are configured to produce a transmitted spread-OFDM signal with a low peak-to-average power ratio (PAPR) and orthogonal code spaces. In MIMO systems, the complex-valued spreading matrix can comprise a MIMO precoding matrix, and the code spaces can comprise MIMO subspaces. In Cooperative-MIMO, a combination of low code-space cross correlation and low PAPR can be achieved."},"analysis":{"summary":null,"layman_explanation":null,"technical_analysis":null,"business_analysis":null,"faqs":null,"topics":[],"tech_cluster":null},"seo":{"title":"Spreading and precoding in OFDM","description":"An OFDM transmitter spreads original data symbols with a complex-valued spreading matrix derived from a discrete Fourier transform. Spread data symbols are mapped to OFDM subcarriers. Spreading and ma","keywords":[]},"attribution":{"source":"Patentable","source_url":"https://patentable.app","canonical_url":"https://patentable.app/patents/US-9628231","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-9628231","citation_suggestion":"Patentable. \"Spreading and precoding in OFDM\" (US-9628231). https://patentable.app/patents/US-9628231","copyright_holder":"Nomic Interactive Technology LLC"},"links":{"html":"https://patentable.app/patents/US-9628231","json":"https://patentable.app/api/llm-context/US-9628231","site":"https://patentable.app","llms_txt":"https://patentable.app/llms.txt"},"generated_at":"2026-06-06T09:18:18.055Z"}