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:
Dec. 02, 2014
Filed:
Nov. 21, 2011
Khalil Haddad, Allen, TX (US);
Khalil Haddad, Allen, TX (US);
Samsung Electronics Co., Ltd., Suwon-Si, KR;
Abstract
A method used in a transmitting device comprising a non-linear amplifier and a digital predistortion (DPD) circuit. The method updates real and imaginary look-up tables used by the DPD. The method comprises: i) time-aligning a complex input signal, A, and a complex output signal, E. Signal A is a scan from 0 to a maximum value comprising N discrete points and signal E also comprises N discrete points. The method comprises: ii) performing an array division of A/E=(Y, Y), where Yand Yare the real and imaginary components, respectively; and iii) computing a real curve and an imaginary curve using curve-fitting algorithms that best fit the data with coordinates (|A|, Y) and (|A|, Y). The method stores the real curve in a real lookup table (LUT) and the imaginary curve in an imaginary lookup table (LUT). The method iteratively updates the real LUT and the imaginary LUT.