Digital predistortion system

The invention belongs to the technical field of wireless communication, and discloses a digital predistortion system. The system includes a time delay unit, a channel switch, a predistortion processing unit, a DAC, a PA, an ADC, an over-distortion compensation unit, an adaptive algorithm unit, a table address generation unit, and a compensation parameter query unit. The time delay unit, DAC, PA, ADC, over-distortion compensation unit and adaptive algorithm unit form a training channel to train pre-distortion compensation parameters. The time delay unit, predistortion processing unit, table address generation unit, compensation parameter query unit, DAC and PA form a predistortion channel to perform predistortion processing on digital baseband input signals, and the pre-distorted signals are power-amplified and output after DA conversion. The digital predistortion system can improve the overcompensation of feedback link distortion of the digital predistortion system and improve the efficiency of a radio freque