中文摘要：

为了进一步提高多径快衰落环境下，正交频分复用（orthogonal frequency-division multiplexing，0FDM）系统的载波频偏估计精度，研究了利用在OFDM符号中插入的导频子载波进行小数倍频偏跟踪的算法在多径快衰落信道下的频偏跟踪性能。通过与常规的基于循环前缀的跟踪算法进行比较，采用导频子载波的频偏跟踪算法，不仅在高斯白噪声信道下能达到很好的频偏跟踪性能，而且在多径快衰落信道下也能实现更准确的频偏估计，因此采用导频子载波的算法更适合用于多径快衰落信道下的频偏跟踪。

英文摘要：

To improve the estimation precision of the carrier frequency offset in a multi-path fast fading environment, the performance of the frequency offset tracking algorithm using a pilot sub-carrier was studied extensively. Comparing with the frequency offset tracking algorithm based on a cyclic prefix, a frequency offset tracking algorithm using a pilot sub-carrier can not only derive better frequency offset tracking performance in the AWGN channel, but also obtain exact frequency offset estimation in multi-path fast fading channels. The algorithm using a pilot sub-carrier therefore is more suitable for frequency offset tracking in the multi-path fast fading channels.