Using digital pre-distortion to compensate for analog signal processing errors

A technique for correction of spectral deformation by preceding the high-power amplifier by predistortion of the digital code before D/A conversion is discussed. Results from some preliminary experiments with the proposed predistortion techniques are presented. A simple test system is considered. How the spectral deformation is measured and how the correction filters are derived and used for predistortion are discussed. The results obtained with and without predistortion are presented and discussed. The implementation of the predistortion technique in a practical radar system is discussed. The main difficulty in this context is to measure the transfer function from which the predistorted code should be derived