Patent ID: 7869761

Claim:
A radio frequency repeater comprising an analog signal processing unit and a digital signal processing unit, wherein the analog signal processing unit comprises: a filtering unit for eliminating noise from receiving signals; an amplification unit on receiving side for receiving and amplifying output signals output of the filtering unit; a frequency conversion unit on receiving side for converting output signals of the amplification unit on receiving side into baseband signals; a frequency conversion unit on transmitting side for converting output signals of an automatic gain control unit into radio frequency band signals; and an amplification unit on transmitting side for amplifying and outputting output signals of the frequency conversion unit on transmitting side, and wherein the digital signal processing unit comprises: a receiving signal detection unit for determining whether signals to be actually repeated exist in the output signals of the frequency conversion unit on receiving side; an automatic gain control unit for controlling a amplitude of output signals of the frequency conversion unit on receiving side; a feedback signal detection unit for updating phase and amplitude of feedback signals using phase and amplitude of feedback signals in an input signals, which is input from the frequency conversion unit on receiving side and the automatic gain control unit; a feedback signal combining unit for generating inverse-feedback signals using the updated phase and amplitude of feedback signals transferred from the feedback signal detection unit; a feedback signal elimination unit for combining the receiving signals output from the frequency conversion unit on receiving side and the inverse-feedback signals output from the feedback signal combining unit to eliminate the feedback signals; an automatic delay control unit for receiving control signals from a control unit and controlling delay time of signals output from the automatic gain control unit to control multi-path environment; and the control unit.