Sampling frequency offset estimation apparatus and method for OFDM system

摘要

A sampling frequency offset estimation apparatus and method to be applied to an OFDM (orthogonal frequency division multiplexing) system are provided. The apparatus includes an ADC (analog-to-digital converter 100) sampling a received signal based on a predetermined sampling frequency; an FFT (Fast Fourier Transform) unit (300) transforming the sampled received signal into a frequency domain; a phase calculator (610) calculating phase shifts of pilot subcarriers of the sampled received signal which has been transformed into the frequency domain; a determiner (620) calculating phase shift reaching times at which samples of the pilot subcarriers shift due to the phase shift; a time offset calculator (630) calculating a sampling time offset using the pilot subcarriers, and a frequency offset calculator (630) calculating a sampling frequency offset based on the phase shift reaching times and the sampling time offset.