Patent ID: 8310962

Claim:
A Time Division Duplex (TDD) radio repeater, comprising: a transmitting/receiving means for transmitting/receiving and filtering forward/backward relay signals; a switching means for switching the forward/backward relay signals according to control of a synchronization acquiring means; a down-converting means for down-converting the forward/backward relay signals from the switching means; a united Adaptive Forward Error Correction (U-AFEC) for removing a feedback signal component in the forward/backward relay signals from the down-converting means and controlling a gain of the forward/backward relay signals; an up-converting means for up-converting the forward/backward relay signals from the U-AFEC; and the synchronization acquiring means for acquiring synchronization based on the forward relay signal from the down-converting means and controlling the U-AFEC and the switching means wherein the U-AFEC includes: an automatic gain control unit for controlling the gain of the forward/backward relay signals; a feedback detection switching unit for switching the forward/backward relay signals from the down-converting means; a forward feedback signal detecting unit for detecting and updating a phase and a size of a feedback signal from the forward relay signal of the automatic gain control unit and the feedback detection switching unit; a backward feedback signal detecting unit for detecting and updating the phase and the size of the feedback signal from the backward relay signal of the automatic gain control unit and the feedback detection switching unit; a reverse feedback signal synthesizing unit for generating a reverse feedback signal based on the phase and the size of the feedback signal from the forward or backward feedback signal detecting unit; a feedback signal removing unit for removing the feedback signal in the forward/backward relay signals from the down-converting means based on the reverse feedback signal from the reverse feedback signal synthesizing unit and transmitting the forward/backward relay signals to the automatic gain control unit; and a control unit for removing the feedback signal in the forward/backward relay signals and controlling each constituent element based on synchronization information from the synchronization acquiring means in order to transmit the forward/backward relay signals.