Patent ID: 6807399
Filing Date: 2004-10-19
Classification: H04B

Abstract:
A repeater system, comprising:a receiving apparatus for receiving a signal from a base station; and a transmitting apparatus, wherein the transmitting apparatus varies a phase and a magnitude of a power amplified transmission signal to generate a compensation signal and applies the compensation signal to the receiving apparatus, and the receiving apparatus adds the inputted compensation signal and a signal inputted through a receiving antenna and removes an unnecessary frequency component caused due to interference of the transmission signal, wherein the transmitting apparatus comprises: a mixer for mixing an intermediate frequency signal outputted from the receiving apparatus and a local signal to generate a radio frequency signal; a power amplifier for amplifying the radio frequency signal outputted from the mixer; a low-pass filter for filtering the output signal of the power amplifier; a transmitting antenna for transmitting the output signal of the low-pass filter toward a destination; a phase converter for converting a phase of the signal amplified by the power amplifier; and a variable amplifier for variably amplifying the output signal of the phase converter so as to adjust the magnitude of the output signal and generating a compensation signal.