A Universal Frequency Offset Estimator for OFDM Applications

This paper studies fractional carrier frequency offset (CFO) estimation for orthogonal frequency-division multiplexing (OFDM) systems. In the IEEE 802.16 (WiMAX) standard, a training symbol structure with three highly correlated but not identical segments is specified. The existing CFO estimation methods require the segments in the training symbol to be identical, so cannot work for the generalized training structure. In this paper, we proposed a universal fractional CFO estimator to solve the problem. Both the analytical and numerical results are presented to confirm the performance of the proposed method.