Fast Frequency Offset Estimation Method for OFDM

A fast frequency offset estimation scheme for OFDM is proposed. This scheme is low-overhead oriented, which uses only one OFDM symbol with L identical slots as preamble. By extracting the phase from correlation between two identical halves of the preamble, the fractional frequency offset is estimated and then compensated. After reshaping the compensated preamble into many L-point sub-symbols, which are processed by FFT algorithm, the estimate of integer frequency offset is accomplished by finding the maximum magnitude of the combined frequency domain signals. To further reduce the computational load of the algorithm, the scheme is carried out in a multistage manner. Simulation results show that the proposed scheme exhibits good performance, while maintaining a low complexity