MODULATED SIGNAL TRANSMISSION SYSTEM CAPABLE OF REMOVING NOT ONLY A NONLINEAR DISTORTION BUT ALSO A LINEAR DISTORTION

摘要

In a modulated signal transmission system operablein response to an input digital signal of a baseband toproduce a modulated signal through a nonlinear amplifier, anonlinear converter is controlled by a control signalgenerator to compensate for not only a nonlinear distortionbut also a linear distortion. The control signal generatoris given a difference signal formed by the difference betweena linearly-detected signal and the input digital signal andthe addition of an estimated linear distortion by a linearfilter having filter coefficients controlled by a filtercoefficient estimator. An additional nonlinear converter islocated prior to the linear filter. Alternatively, thelinear filter may be located after the nonlinear converter.