DIGITAL REPEATER SYSTEM

A digital repeater system is provided to transmit a downward signal as a digital signal through an optical line without passing through an RF(Radio Frequency) coupling process, thus high-quality signal transmission without noise signals is available, consequently a mobile communication system operates with optimum performance. An RRH(Radio Remote Headend) unit(250) comprises as follows. A DAC(Digital to Analog Converter)(262) receives a digital signal from a modem(222) of a base station(210) to convert the digital signal into an analog signal. An up converter(264) increases a frequency of an output signal of the DAC(262). A transceiving converter(254) performs transceiving conversion of a signal through an antenna(252). A down converter(256) lowers a frequency of an output signal of the transceiving converter(254). An AGC(Automatic Gain Controller)(258) controls a gain of an output signal of the down converter(256). An ADC(Analog to Digital Converter)(260) converts an output signal of the AGC(258) into a digital signal, and transmits the digital signal to an upward signal combination module(230).