C15. CFO mitigation in OFDM systems with a comparative analysis to CP-based estimator technique

The sensitivity of Orthogonal Frequency Division Multiplexing (OFDM) systems to Carrier Frequency Offset (CFO) is a major disadvantage. Researchers have proposed various CFO compensation techniques. One method is to use the inherent construction of the OFDM symbol by estimating the value of CFO using the cyclic prefix (CP) part then compensate for it. The estimated CFO range of this method does not exceed half the value of the subcarrier spacing. One of the major competitions between researchers is to enlarge the estimation range. Our proposed scheme enlarges this range by four times at least compared to the CP-based technique keeping low complexity. This is done at the expense of reducing, slightly, the transmitted data rate. This paper discusses the proposed scheme in both cyclic-prefix and zero-padding systems with a comparative analysis to the CP-based estimator technique. The simulations are done for Rayleigh multipath fading channels using MATLAB.