Interference cancellation apparatus and method in a WiBro repeater, repeater therewith

Disclosed are a feedback channel interference canceling apparatus and method for processing an interference signal that is output by an echo signal from a WiBro repeater, and a repeater having the same. The WiBro repeater according to the present invention, which relays an OFDM signal, removes an interference signal calculated through feedback channel estimation from a received signal, and uses the pilot signal included in the received signal to adjust characteristics of the feedback channel. An interference canceling unit for separating the original signal from the received signal by estimating; And an amplifier for amplifying and transmitting the original signal from which the interference has been removed. According to the present invention, it is possible to easily implement the interference canceling apparatus and method with a simple structure.