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

摘要

According to the present invention, a digital pre-distortion device and method for use in a dynamic spectrum allocation system, which uses a breadband frequency range, such as a cognitive radio (CR) system, are implemented. Also, while as conventional pre-distortion device only enable the linearization of a signal of a fundamental frequency band, the digital pre-distortion device and method according to the present invention enable not only the linearization of a basic signal on frequency fc, but also simultaneously enable the elimination of harmonic signals on the high frequencies of 2fc, 3fc, 4fc, etc. The digital pre-distortion device for a broadband power amplifier according to a preferred embodiment of the present invention comprises: a nonlinear power amplifier; an equivalent amplifier model estimator; N pre-distorters; and a coefficient extractor for extracting the coefficients of the N pre-distorters.

主权项

1. A digital predistortion device for broadband power amplifier, comprising:
Digital to Analog Converters (DACs) for converting N input signals generated by a random signal generator into analog signals; first mixers for upconverting the N input signals converted by the DACs; real operators for selecting real number signals from the N input signals upconverted by the first mixer; a nonlinear power amplifier for amplifying N input signals and then generating N output signals; second mixers for downconverting the N output signals of the nonlinear power amplifier; Analog to Digital Converters (ADCs) for converting the N output signals downconverted by the second mixers into digital signals; low pass filters for eliminating image signals from the N output signals converted by the ADCs; an equivalent amplifier model estimator for receiving the N input signals and the N output signals, and estimating characteristics of the nonlinear power amplifier; N predistorters for eliminating or compensating for all or part of the N output signals; and a coefficient extractor for extracting coefficients of the N predistorters using the characteristics of the nonlinear power amplifier estimated by the equivalent amplifier model estimator.