Patent ID: 8364076

Claim:
An apparatus for cancelling a feedback signal of an on-channel repeater, comprising: an antenna configured to receive a Radio Frequency (RF) signal; a first Radio Frequency (RF) receiver configured to down-convert the received RF signal to a predetermined frequency band; a subtractor configured to generate a feedback cancelled signal by subtracting a replica of a feedback signal from the down-converted signal of the first RF receiver; a transmission signal generator configured to generate a repeater output signal using the feedback cancelled signal of the subtractor; a RF transmitter configured to wirelessly transmit the repeater output signal of the transmission signal generator; a second RF receiver configured to down-convert a RF signal outputted from the RF transmitter to a predetermined frequency band; a reference signal generator configured to receive the RF signal output from the RF transmitter and generate a reference signal having no DC pilot; and a replica generator configured to generate a filter coefficient using correlation between the feedback cancelled signal of the subtractor and the reference signal of the reference signal generator and to generate a replica of the feedback signal using the generated filter coefficient and the down-converted signal of the second RF receiver.