中文摘要：

针对高速正交频分复用（Orthogonal frequency division multiplexing，OFDM）系统，提出了一种新的非数据辅助（Non—data aided，NDA）载波残余频偏（Residual frequency offset，RFO）跟踪方法。利用RFO造成的时域信号相位旋转和频域子载波相位偏移特性，提取相位误差信息，并通过设计合理的环路滤波器输出误差估计量补偿时域和频域相位。该方法适用于相移键控（MPSK）调制的OFDM系统，可对不超过子载波间隔5％的残余频偏进行精确的跟踪。由于不需要利用导频子载波，提高了传输效率。本文对算法进行了计算机仿真，结果表明，该方法在加性高斯白噪（AWGN）和多径（Multipath）信道下具有良好的性能，且实现复杂度低。

英文摘要：

A non-data-aided（NDA） method without the pilot signals is proposed for the residual frequency offset （RFO） in orthogonal frequency division multiplexing （OFDM） systems, by using the rotation property of OFDM signals in time domain and the phase offset in frequency domain. Specifically, with the extraction of the phase error information, two one-tap loop filters are used for the phase compensation. The RFO of less than 5% of the subcarriers spacing can be tracked for OFDM systems with MPSK modulation. The pilot subcarriers are saved so it is efficient. The performance of the proposed algorithm is verified by simulations. Results demonstrate that the proposed algorithm works well in AWGN and mutipath fading channel. Moreover, the implementation is easier than the traditional tracking methods for OFDM systems.