Apparatus and method for controlling digital agc in ofdma communication system

The present invention in a communication system, the change in frame-by-frame power level significantly appears, digital automatic gain controller (AGC: Auto Gain Controller) that, (Signal to Noise Ratio) uplink SNR of the next frame to an apparatus and method for controlling the the estimated output SNR estimator and a power meter for measuring and outputting the up-link received power for each frame, from the SNR estimator (n-1) from the SNR estimate and the power meter of the second frame (n-1, which ) predicts the uplink power of an n th frame using the received power measurement of the second frame, using the uplink power of the prediction to calculate the gain (gain) of the automatic gain control to be applied to the n-th frame It includes a gain calculator. This invention before, by using the calculated SNR estimate of the current frame and the received power measurement of the current frame prediction the size of the upstream signal of the next frame, and using the predicted value controlling a digital automatic gain controller, a digital automatic gain there is an advantage that the controller is able to detect the more accurate the effective bits. OFDMA, OFDM, AGC, Gain, SNR