Patent ID: 8213891

Claim:
A gain control apparatus in a receiver of a multiband Orthogonal Frequency Division Multiplexing (OFDM) system, the gain control apparatus, comprising: an amplification unit configured to amplify a reception signal based on a first auto gain control signal; an analog-to-digital conversion unit configured to convert the amplified signal into a digital signal; a plurality of band reception signal extraction units configured to extract a signal of a desired reception band from the digital signal for each reception band, and control a gain of the extracted signal according to a second auto gain control signal; a reception power detection unit configured to detect a reception power value of whole band from the digital signal to output the detected reception power value; and a multiband integration baseband processor configured to generate the first auto gain control signal by using the detected reception power value of the whole band, and generate the second auto gain control signal to be provided to the band reception signal extraction units by using power information of a whole band, resource allocation information for each band, and a reception power for each reception band.