SYSTEM AND METHOD FOR FAST POLYNOMIAL PRE-DISTORTION

摘要

A system and method for method of pre-distorting a signal applied to a power amplifier to compensate for distortion introduced by the power amplifier at different power settings, comprising pre-distorting the signal according to a pre-distortion polynomial, prior to amplification of the signal by the power amplifier; adaptively estimating and applying pre-distortion polynomial coefficients to the pre-distorter by saving successive iterations of adaptive estimation of the pre-distortion polynomial coefficients; and regularizing estimation of the pre-distortion polynomial coefficients over successive iterations according to a modified objective function that initially constrains growth in the magnitude of the pre-distortion polynomial coefficients and then relaxes the constraint in growth over successive iterations until estimation is reduced to a steady-state least squares estimation.

主权项

1. A system for pre-distorting a signal applied to a power amplifier to compensate for distortion introduced by the power amplifier at different power settings, comprising:
a pre-distorter for pre-distorting the signal according to a pre-distortion polynomial, prior to amplification of the signal by the power amplifier; an adaptive estimator for adaptively estimating and applying pre-distortion polynomial coefficients to the pre-distorter, wherein the adaptive estimator includes
a first estimation loop for saving successive iterations of the adaptive estimator; anda second estimation loop including an estimation regularizer for regularizing estimation of the pre-distortion polynomial coefficients over successive iterations according to a modified objective function that initially constrains growth in the magnitude of the pre-distortion polynomial coefficients and then relaxes the constraint in growth over successive iterations until estimation is reduced to a steady-state least squares estimation.