the present invention is directed to systems and methods for reducing the distortion of power amplifiers . in particular , methods and systems are described that enable a determination of a pre - distortion correction signal to be determined , which when added to the nominal signal , a reduction in the distortion of the power amplifier results . in addition , methods and systems are described that enable calibration of individual power amplifiers to be accomplished for use with the above described approach . more specifically , the methods and systems are described for use in a mimo application . these approaches may be applied to on - chip power amplifiers , off - chip power amplifiers , or any combination thereof .