Fast frequency tracking algorithm for OFDM applications

In this paper, we present a fast frequency tracking algorithm for orthogonal frequency division multiplexing (OFDM) applications. Based on a novel cost function of the carrier frequency offset (CFO), an improved gradient method is proposed to construct the recursive formula. The modified S curve is also employed for the purpose of accelerating frequency tracking. Performance of the proposed algorithm is investigated analytically as well as by simulation. In comparison to the previous methods, the proposed method has faster tracking speed, larger tracking range and lower implementation complexity.