The automatic gain control apparatus in a wireless communication system and method

The present invention full-duplex for performing interference cancellation (full duplex) automatic gain control of the relay apparatus: relates to a target RSSI adaptive control apparatus and method for (Automatic Gain Control AGC). The invention consists of the SIR estimator and the target RSSI decision unit and the AGC device is the target RSSI is applied to determine a target RSSI by using a value outputted from the SIR estimating part for estimating a received signal power ratio of the interference signal . Full Duplex (full duplex) when becoming the relay transmitter signal fed back to the relay receiver is great interference signal input, the use of the AGC is the target RSSI applied by practice of the invention the increase of the quantization noise as compared to the AGC is not considered to interfere with the existing as it is possible to reduce the performance degradation due. Full Duplex (full duplex) relay, automatic gain control (AGC), the target RSSI, SIR estimation, and the maximum data rate MCS level