{"schema_version":"1.0","canonical_url":"https://patentable.app/patents/US-8488442","patent":{"patent_number":"US-8488442","title":"Compensation for residual frequency offset, phase noise and I/Q imbalance in OFDM modulated communications","assignee":null,"inventors":[],"filing_date":"2011-01-20T00:00:00.000Z","publication_date":"2013-07-16T00:00:00.000Z","cpc_codes":["H04L","H04L","H04L","H04L","H04L","H04L"],"num_claims":9,"abstract":"A method including downconverting an analog radio frequency signal into an analog baseband signal; recovering an analog in-phase signal and an analog quadrature signal from the analog baseband signal; converting the analog in-phase signal into a corresponding digital in-phase signal; converting the analog quadrature signal into a corresponding digital quadrature signal; compensating the digital in-phase signal and the digital quadrature signal; converting the compensated digital in-phase signal and the compensated digital quadrature signal into a frequency domain digital Orthogonal Frequency Division Multiplexing (OFDM) symbol; generating a plurality of channel estimates, wherein each channel estimate corresponds to an estimate of the channel for a corresponding sub-carrier of the frequency domain digital OFDM symbol; and generating (i) a most likely estimate of the imbalance between the digital in-phase signal and the digital quadrature signal and (ii) a most likely estimate of a common phase error in the plurality of channel estimates."},"analysis":{"summary":null,"layman_explanation":null,"technical_analysis":null,"business_analysis":null,"faqs":null,"topics":[],"tech_cluster":null},"seo":{"title":"Compensation for residual frequency offset, phase noise and I/Q imbalance in OFDM modulated communications","description":"A method including downconverting an analog radio frequency signal into an analog baseband signal; recovering an analog in-phase signal and an analog quadrature signal from the analog baseband signal;","keywords":[]},"attribution":{"source":"Patentable","source_url":"https://patentable.app","canonical_url":"https://patentable.app/patents/US-8488442","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-8488442","citation_suggestion":"Patentable. \"Compensation for residual frequency offset, phase noise and I/Q imbalance in OFDM modulated communications\" (US-8488442). https://patentable.app/patents/US-8488442","copyright_holder":"Nomic Interactive Technology LLC"},"links":{"html":"https://patentable.app/patents/US-8488442","json":"https://patentable.app/api/llm-context/US-8488442","site":"https://patentable.app","llms_txt":"https://patentable.app/llms.txt"},"generated_at":"2026-05-31T23:11:30.829Z"}