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:
Jul. 31, 2007
Filed:
Oct. 04, 2004
Andrew M. Khan, Schaumburg, IL (US);
Christopher P. Thron, Austin, TX (US);
Curtis M. Williams, Schaumburg, IL (US);
George F. Opas, Park Ridge, IL (US);
Andrew M. Khan, Schaumburg, IL (US);
Christopher P. Thron, Austin, TX (US);
Curtis M. Williams, Schaumburg, IL (US);
George F. Opas, Park Ridge, IL (US);
Motorola, Inc., Schaumburg, IL (US);
Abstract
A method and apparatus for predistortion training in an amplifier using predistortion is provided herein. Predistortion takes place by collecting a series of envelope errors and averaging the envelope errors for various amplitude regions. LUT values are modified based on a curve-fit to the average amplitude values for each amplitude region. By utilizing a curve-fitting technique, the pitfalls of modifying individual LUT coefficients is avoided. Particularly, because the errors are collected in relatively broad regions and then averaged, the importance of exact correlation between a measured error and a specific LUT entry is significantly lessened.