Improved coarse frequency synchronization algorithm with extended differential detection

OFDM (orthogonal frequency division modulation) is a very promising technique for future communication system. However, frequency offset is well known as one of the main factors that influence the performance of OFDM communication systems. Various coarse frequency synchronization algorithms based on differential detection have been proposed to cope with the oscillation in frequency response in dispersive channel. This paper extends the concept of differential detection and improves existing coarse frequency offset synchronization algorithm. In this modified algorithm, parameter can be adjusted to obtain different performance tradeoff. In addition, compared with the conventional algorithm, the computation complexity of this proposed algorithm only increases a little and remains the same order. Simulations are carried out to verify the improvement of performance of our proposed algorithm.