Patent ID: 7336725
Filing Date: 2008-02-26
Classification: H03F,H04L

Abstract:
1. A digital predistorter, comprising: an input for receiving a digital communication signal comprising a stream of signal samples; a linear dynamic compensation circuit coupled to the input and providing a linear operation on a plurality of time delayed signal samples; a digital envelope detector coupled to the input and providing a stream of discrete digital envelope signal samples corresponding to the input signal samples; a finite impulse response filter coupled to the envelope detector and providing a first nonlinear operation on a plurality of delayed envelope signal samples; an infinite impulse response filter bank coupled to the envelope detector in parallel with said finite impulse response filter and providing a second nonlinear operation on plural delayed envelope samples; and a combiner for combining the outputs of the linear dynamics compensation circuit, finite impulse response filter and infinite impulse response filter bank and providing a digital predistortion signal as an output.