Distortion compensation apparatus, signal transmitter and method for transmitting signal

PURPOSE: A distortion compensation apparatus, a signal transmitting device, and a method thereof are provided to prevent performance degradation because of calculation error during a process of extracting distortion information. CONSTITUTION: A distortion compensation apparatus(12) recompenses nonlinearly characteristic of a nonlinear device(10) for wireless telecommunication. The nonlinear device outputs linear signal through a transmission antenna(14) using a distortion compensation apparatus. The distortion compensation apparatus uses a signal predistortion mode in order to recompense the nonlinear characteristic of the nonlinear device. The distortion compensation apparatus comprises an additional signal applying unit(120), a predistortion unit(122), and an indirect adaptation controller(124).