METHOD AND APPARATUS FOR REALIZING DECIMAL FREQUENCY OFFSET ESTIMATION

摘要

A method and apparatus for realizing decimal frequency offset estimation are provided by the present invention. The relationship of decimal frequency offset values between in the frequency domain and in the time domain is utilized, and the frequency domain correlation is adopted to replace the time domain correlation, and correlation sequence components corresponding to the highest power value and its neighbourhood are deleted from a frequency domain correlation sequence, only the remained correlation sequence is accumulated to obtain a frequency offset. Because the frequency of the single tone interference is generally not equal to the subcarrier frequencies, the single tone interference, after a frequency domain transform, will be decomposed onto the nearest frequency point and the neighboring frequency points. Hence, by deleting the components near the highest value, the influence of the single tone interference is better eliminated, thus the robustness of the decimal frequency offset estimation is improved greatly, and the influence of the single tone interference and direct-current component on the performance of the decimal frequency offset estimation is eliminated.