Blind Synchronization Method of OFDM Sampling Frequency Based on Correlation Peak

Abstract

This paper studies the synchronization of sampling frequency for OFDM systems. A method of blind synchronization of OFDM sampling frequency based on correlation peak is proposed. The interpolation algorithm is used to interpolate the sampled signals at different intervals. The peak position of the correlation curve between the interpolated signals and the cyclic prefix of the original signals is used for accurate estimation of effective symbol length, through which the accurate synchronization of sampling frequency offset is possible. The simulation results show that the method is independent of sampling frequency offset, carrier frequency offset and OFDM system baseband modulation method. With the method, a small number of OFDM symbols are needed for high-accuracy estimation of sampling frequency offset.