Digital pre-distortion device and method for a broadband power amplifier

A digital predistortion method for broadband power amplifier, comprising:

• (a) generating N input signals by a random signal generator;
• (b) converting the N input signals, by Digital to Analog Converters (DACs), into analog signals;
• (c) upconverting, by first mixers, the N input signals converted by the DACs;
• (d) selecting, by real operators, real number signals from the N input signals upconverted by the first mixer;
• (e) amplifying the N input signals and then generating N output signals, by a nonlinear power amplifier;
• (f) receiving the N input signals and the N output signals and estimating characteristics of the nonlinear power amplifier by an equivalent amplifier model estimator;
• (g) extracting, by a coefficient extractor, coefficients for N-1 harmonic elimination predistorters and a fundamental signal predistorter, using the characteristics of the nonlinear power amplifier estimated by the equivalent amplifier model estimator;
• (h) eliminating second or higher harmonic signals from the N output signals by the N-1 harmonic elimination predistorters;
• and
• (i) the fundamental signal predistorter compensating for nonlinear characteristics occurring in a fundamental signal among the N output signals, by the fundamental signal predistorter.