Interpolation Based Frequency Synchronization in OFDM System

The mismatch of the oscillators in transmitter and receiver and the Doppler shift,introduce an offset in the expected carrier frequency.In orthogonal frequency-division multiplexing(OFDM) systems,this frequency offset causes large errors in the signal values.Therefore,it is very important to correct the offset.In this paper,an interpolation-based algorithm is proposed for carrier frequency offset synchronization in OFDM systems.This algorithm is based on maximum-likelihood estimation,for acquisition purpose,only uses one OFDM symbol block.And,because the algorithm is dependent on system phase offset,it is more robust.As an synchronization algorithm for acquisition phase,it gives a very good start of tracking phase,then general BER performance will be improved.