A Frequency Estimation Method for Improving Acquisition Accuracy of TC-OFDM

摘要

Aiming at the shortcomings that existing traditional receivers have a low frequency estimation accuracy in terrestrial fading channels, this paper presents a high-precision frequency estimation method. Using multiple parallel down converters and integral unit to down convert and integrate the stored RF signals with multiple local frequencies, then using cubic spline interpolation algorithm to fit the integral result to finally obtain the residual carrier frequency estimation value. The simulation results show that in the terrestrial fading channels, compared with the traditional linear frequency search method, the proposed algorithm can improve the capture frequency estimation accuracy of TC-OFDM receiver, the mean value of the frequency estimation error is less than 1 Hz reaching the request of the receiver phase-locked loop.