DEVICE OF COMPENSATING FOR PHASE ERROR OF DIGITAL SIGNAL AND METHOD THEREOF

摘要

PURPOSE: A device of compensating for a phase error of a digital signal is provided to stop an operation of an equalizer during delay time of the equalizer, and to operate the equalizer after almost removing a phase error, thereby enabling the equalizer to focus on removing inter-symbol interference by reducing burden of the equalizer. CONSTITUTION: An equalizer(210) outputs a compensated equalization signal when the first predetermined delay time elapses. The first multiplier(260) complex-multiplies the compensated signal, and outputs the first multiplied value. The first multiplexer(220) selectively outputs a receiving signal and the first multiplied value. A phase compensator(230) sets an initial value of a local oscillator before the first delay time elapses, and removes a phase error existing in the first multiplied value after the first delay time elapses. A signal decider(240) decides an original signal from an inputted signal. A subtractor(290) compares an input signal with an output signal, and detects an error. The second multiplier(270) multiplies the output signal of the subtractor(290) by an output signal of the phase compensator(230), and outputs the second multiplied value. The third multiplier(280) multiplies an output signal of the decider(240) by the output signal of the compensator(230), and outputs the third multiplied value. The first switch(295-1) supplies an output signal of the first multiplexer(220) to the subtractor(290). The second switch(295-2) supplies the output signal of the decider(240) to the subtractor(290) and the third multiplier(280). An error controller(250) controls an error value, and supplies the error value to the equalizer(210).