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:
Aug. 12, 2008
Filed:
Nov. 25, 2003
Spendim Dalipi, Sollentuna, SE;
Spendim Dalipi, Sollentuna, SE;
Telefonaktiebolaget L M Ericsson (Publ), Stockholm, SE;
Abstract
A power amplifier pre-distorter is formed by a FIR filter structure which includes an individual look-up table for each filter tap, where each look-up table represents a sample polynomial in a variable representing signal amplitude, and means for selecting, from each filter tap look-up table, a filter coefficient that depends on the amplitude of corresponding complex signal value to be multiplied by the filter tap. A training method for such a pre-distorter sets (S) the entries of table Tand Tto predetermined values. Then it measures and stores (S) a batch of input signals x and feedback signals y. New estimates of Tand Tare determined (S) using an iteration of a least mean square based iterative procedure. Then it is tested (S) whether the tables have converged. If the tables have converged, the current estimates are provided as the final tables. Otherwise another iteration (S-S) of the least mean square procedure is performed.