Patent ID: 7826801

Claim:
An adaptive feedback estimation and cancellation (AFEC) apparatus for repeating between a base station and a terminal, the apparatus comprising: a controller for generating and outputting control information by using a synchronization signal from an external synchronization acquisition unit and base station information, in order to remove a feedback signal that exists in a forward/reverse repeater signal to be repeated and then send the forward/reverse repeater signal; a first feedback prediction canceller for adaptively removing a feedback signal that exists in the forward repeater signal based on the control information from the controller and automatically adjusting the gain of the forward repeater signal; a second feedback prediction canceller for adaptively removing a feedback signal that exists in the reverse repeater signal based on the control information from the controller and automatically controlling the gain of the reverse repeater signal; a first automatic delay adjustor for preventing mutual interference between the feedback signal that exists within the forward repeater signal and a multipath signal under the control of the controller; a second automatic delay adjustor for preventing mutual interference between the feedback signal that exists within the reverse repeater signal and the multipath signal under the control of the controller, wherein, the first automatic delay adjustor and the second automatic delay adjustor adjust the generation delay of the feedback signal so that the feedback signal is generated at the moment when the multipath signal is not received.