Blind estimation of large carrier frequency offset in wireless OFDM systems

In this paper, a highly efficient blind band-edge filter-based technique is introduced for the estimation of carrier frequency offsets that are much larger than the subcarrier spacing in orthogonal-frequency-division-multiplexing (OFDM) systems. The proposed scheme is shown to have a high accuracy and an acquisition range that is much larger than the subcarrier spacing limitation inherent to other synchronization techniques. The performance of the proposed system as well as other well-referred techniques is assessed over additive white Gaussian noise and frequency-selective fading channels using different pulse shaping filters.