A Highly Accurate Iteratively Interpolated Frequency Estimator

Based on the "half stock fence"-interpolated FFT coefficients of a single-tone sequence, this paper presents a novel frequency estimation iteration algorithm starting with the Rife-Jane\´s estimator, which develops a symmetry frequency offset estimator and employs adaptive adjustment technique of the symmetric center. Computer Monte-Carlo simulations show that the algorithm is effective and the proposed estimator outperforms the traditional Rife-Jane\´s estimator in both accuracy and the CRLB-approximate RMSE of estimation over the whole frequency range. It is also shown that the Rife-Jane\´s initialized iteration has as lower SNR threshold as to about -12 dB.