Patent ID: 8903015
Filing Date: 2014-12-02
Classification: H03F

Abstract:
1. For use in a transmitting device comprising a non-linear amplifier, a digital predistortion (DPD) circuit including a non-linear filter (NF) block, and a residual error model (REM) block associated with the non-linear amplifier and the DPD circuit configured in a direct learning architecture, a method of updating parameters of the NF block comprising: at iteration n, where n is an integer, computing the parameters of the REM block; at iteration n, computing inverse parameters of the REM block; combining the inverse parameters of the REM block computed at iteration n with the parameters of the NF block computed at iteration n−1 to produce new parameters of the NF block; replacing the parameters of the NF block at iteration n−1 with the new parameters of the NF block, wherein the DPD circuit further comprises a memoryless linearity block preceding the non-linear filter (NF) block and a second non-linear filter block preceding the memoryless linearity block.