SYSTEMS AND METHODS FOR BASIS FUNCTION ORTHOGONALIZATION FOR DIGITAL PREDISTORTION

摘要

Systems and methods are disclosed for digitally predistorting an input signal of a non-linear subsystem according to a digital predistortion model that orthogonalizes a set of basis functions of the digital predistortion model to provide improved numerical stability for single band and multi-band systems. In some embodiments, the digital predistortion model orthogonalizes outputs of a set of basis functions that includes both primary basis functions for a frequency band and at least one additional basis function. In some embodiments, the at least one additional basis function includes a delayed version(s) of one or more of the primary basis functions. In other embodiments, the non-linear subsystem is a concurrent multi-band system, and the at least one additional basis function includes primary basis functions for one or more additional frequency bands.