TRANSMITTING AND RECEIVING OVER-INPUT ISOLATION APPARATUS IN MOBILE COMMUNICATION REPEATER AND METHOD THEREOF

摘要

An apparatus and a method for blocking transmission/reception over-input in a mobile communication repeater are provided to provide a stable service to a mobile terminal which normally performs call communication through a different frequency channel without interruption and degradation of speech quality. A reception antenna(100) receives a signal to be relayed from a base station(mobile station) of a shadow area. A BPF(Band Pass Filter)(110) filters the signal received through the reception antenna(100). An LNA(Low Noise Amplifier)(120) receives the filtered signal and amplifies it. A down-converter(130) receives the amplified signal and down-converts it into an IF(Intermediate Frequency) band. An input monitoring unit(140) measures input signal levels of each frequency channel and transmits the results. A controller(150) compares input signal level values of each frequency channel with a pre-set level value, and if an input signal level is determined as an abnormally high input for more than a certain time, the controller(150) controls such that a corresponding frequency channel is attenuated or cut off, and transfers the result. A channel filter unit(160) selectively attenuates or cuts off the entire usage band or a signal of the abnormal corresponding frequency channel. An up-converter(170) up-converts the IF signal whose entire use band or particular frequency channel was attenuated or cut off into a high frequency band. A power amplifier(180) amplifies the signal of the up-converter(170). When an abnormal over-input signal is detected, a state monitoring unit(190) reports the detection result to a corresponding base station in real time. A transmission antenna(200) transmits the signal amplified by the power amplifier(180) or the result detected by the state monitoring unit(190) to the base station.