DPD tuning with frequency selective distortion minimization

The determination of the coefficients of digital predistorter (DPD) models, for power amplifier (PA) linearization, is commonly performed through least mean squares techniques, where the residuals of the PA output signal are minimized as a whole. However, telecommunication regulation restrictions usually address distinct characteristics of these residuals, such as EVM and IMR. In this work we present a DPD extraction method for compensating specific characteristics of the PA behavior, discriminated in the frequency domain. This technique leads to DPDs more dedicated, for instance, to maximizing the IMR instead of the conventional minimization of the NMSE. A demonstration of the method's performance is presented in a multichannel GSM scenario.