Patent ID: 8040990

Claim:
An apparatus for estimating a sampling frequency offset, the apparatus comprising: a waveform characteristic extraction unit which extracts a waveform characteristic of a training sequence period in one frame period of a sample data signal and outputs a waveform characteristic value corresponding to the waveform characteristic of the training sequence period; a variation quantity calculation unit which calculates a waveform characteristic variation quantity representing a variation quantity in waveform characteristic between an m-th frame and an (m−k)-th frame based on a waveform characteristic value in the m-th frame and a waveform characteristic value in the (m−k)-th frame, where m and k are independently integers of 1 or more; a SFO (sampling frequency offset) estimator which estimates an SFO of the sample data signal based on the waveform characteristic variation quantity, wherein the variation quantity calculation unit includes: a delayer which delays the waveform characteristic value in the (m−k)-th frame by k frames and outputs the delayed waveform characteristic value; and a subtracter which calculates a difference between the waveform characteristic value in the m-th frame output from the waveform characteristic extraction unit and the waveform characteristic value in the (m−k)-th frame output from the delayer and outputs the waveform characteristic variation quantity.