Joint estimation for Carrier Frequency Offset and Sampling Frequency Offset in OFDM systems

For solving the problem of non-ideal factors introduced from the analog front-end in Orthogonal Frequency Division Multiplexing (OFDM) systems, a joint estimation method of Carrier Frequency Offset (CFO) and Sampling Frequency Offset (SFO) is proposed. This algorithm uses three consecutive preamble symbols to estimate and is robust to large I/Q imbalance. It can reduce interference of Gaussian noise by considering all the samples and taking the advantage of them. Compared to the previous methods, the simulation results show that the proposed method can provide high precision in CFO and SFO estimation, which is robust to large-scale SNR and I/Q imbalance.