Method for Estimating Frequency Offset based on OFDM System and Apparatus Thereof

摘要

The present invention relates to a frequency error estimating method based on an OFDM system and a device thereof. The frequency error estimating method based on the OFDM system according to the present invention comprises; a step of receiving an OFDM signal in which a pilot subcarrier is inserted from a transmission terminal and Fourier-transforming the received OFDM system; a step of grouping pilot subcarriers having a specific phase difference between the pilot subcarriers included in the OFDM signal as a sub group; a step of changing the pilot subcarriers included in the sub group as the same phase; a step of calculating a correlation value between adjacent subcarriers according to the each sub group and adding the correlation values obtained in the sub group; and a step of selecting an integer multiple frequency error estimating value in which the added value of the correlation values becomes a maximum value. According to the present invention, the calculation complexity can be reduced in comparison with a traditional technique by reducing complex multiplication calculation between the adjacent subcarriers of the correlation calculation of the subcarriers. Also, high costs generated in the actual implementation and the number of hardware can be reduced.