Apparatus and method for digital predistortion of non-linear amplifiers
US8903015B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Nov 21, 2011 |
| Grant date | Dec 2, 2014 |
| Priority date | — |
| Expiry date | Sep 23, 2032 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F2201/3233
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
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=(Yr, Yi), where Yr and Yi are 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|, Yr) and (|A|, Yi). 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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.