Patent ID: 6630862
Filing Date: 2003-10-07
Classification: H03F

Abstract:
A circuit for pre-distorting an input signal v to be transmitted via a power amplifier having a non-linear transmission characteristic to produce a pre-distorted input signal y, the circuit comprising:an estimator for determining an estimation signal (22) based on the power of said input signal; a look-up table for storing complex pre-distortion coefficients BR and AI which depend on the power of said input signal v and the non-linear transmission characteristic of said power amplifier determined in advance, wherein BR=ARâˆ’K, K being a constant with 0R and AI are the real and imaginary parts respectively of a complex pre-distortion function A which provides a pre-distortion of the input signal v such that the distortion introduced by the non-linear transmission characteristic is substantially compensated for according to magnitude and phase; and a pre-distorter for pre-distorting the input signal according to y=vÂ·(K+BR+jAI).