A high performance frequency offset estimation method for OFDM systems

In this paper, we proposed a new frequency synchronization method for an orthogonal frequency division multiplexing (OFDM) system by using training sequences. In the conventional method, the estimation range of the frequency offset is determined by the period of the repeated sequences which compose the training sequence. But in the new method it is independent of period of the repeated sequences. The proposed method can estimate frequency offset over ten times the subcarrier separation. So we can choose a longer period of repeated sequence for time synchronization, which means much better performance can be achieved. Also the method can be extended to any other methods for frequency synchronization as long as a known training sequence is used.