Patent ID: 8498369
Filing Date: 2013-07-30
Classification: H03F,H04L

Abstract:
1. A method for adaptive digital post distortion reduction, the method comprising: receiving an analog radio frequency (RF) signal; downconverting a frequency of the analog RF signal using analog circuitry to generate a downconverted analog RF signal; converting the downconverted analog RF signal to a digital signal using an analog to digital converter (ADC); training a nonlinear equalizer based on an error signal by subtracting a transformation signal output of the nonlinear equalizer from a reference signal output of a multiplexer to generate the error signal; and in response to training the nonlinear equalizer, applying digital post distortion reduction to the digital signal using the nonlinear equalizer to reduce nonlinearity associated with the digital signal, wherein the nonlinear equalizer is based on an adaptive Volterra filter, a polynomial expansion, or a combination thereof.