The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 06, 2007
Filed:
Dec. 05, 2003
Xu Zhou, Sunnyvale, CA (US);
Chihming (Norman) Chen, Fremont, CA (US);
Chih (Rex) Hsueh, Cupertino, CA (US);
Orlando Canelones, Pflugerville, TX (US);
Xu Zhou, Sunnyvale, CA (US);
Chihming (Norman) Chen, Fremont, CA (US);
Chih (Rex) Hsueh, Cupertino, CA (US);
Orlando Canelones, Pflugerville, TX (US);
Advanced Micro Devices, Inc., Sunnyvale, CA (US);
Abstract
An OFDM receiver configured for measuring frequency error based on comparing prescribed pilot tones from a prescribed group of consecutive symbols in a received OFDM signal. A complex conjugate generator is configured for generating complex conjugates of the prescribed pilot tones of a first subgroup of the consecutive symbols. A multiplier is configured for generating a complex pilot product, for each symbol subgroup position, by multiplying the pilot tones of a second subgroup symbol at the corresponding symbol subgroup position with the respective complex conjugates of the first subgroup symbol at the corresponding symbol subgroup position. A complex summation circuit sums the complex pilot products of the symbol subgroup positions to obtain an accumulated complex value. A error calculator calculates the frequency error from the accumulated complex value for use in correcting frequency offset.