Patent ID: 6631174
Filing Date: 2003-10-07
Classification: H03J,H04L

Abstract:
An automatic frequency control apparatus comprising:a distortion detecting unit for detecting a fading distortion according to a known signal inserted into an incoming signal; a first phase difference estimating unit for estimating a phase difference in a prespecified first period from the fading distortion and outputting the estimated value as a first phase difference; a second phase difference estimating unit for estimating a phase difference in a prespecified second period different from the first period from the fading distortion and outputting the estimated value as a second phase difference; a phase difference computing unit for computing a phase difference in one symbol in the incoming signal according to the first phase difference and the second phase difference and outputting the computed value as a third phase difference; an integrating unit for executing integration processing for the third phase difference by means of iterative addition and outputting a phase signal as a result of the integration processing; and a phase rotating unit for rotating a phase of the incoming signal according to the phase signal.