中文摘要：

在无线通信领域,现在可利用的频谱资源是有限的,正交频分复用技术（OFDM）是提高频谱资源利用率的途径,得到了广泛的研究和使用。多普勒频移会破坏OFDM信号子载波之间的正交性,从而导致载波间干扰（ICI）,使系统的性能大大降低,所以对多普勒频移进行估计和补偿是十分重要的。分析了一种基于循环前缀的多普勒频移估计算法,并且对算法进行了仿真和性能分析。最后,提出了一种算法的改进方案,并且进行了仿真及性能比较,证明了改进方案的可行性。

英文摘要：

The spectrum resource which can be used in the field of wireless communication is limited. The orthogonal frequency division multiplexing（OFDM）is an avenue to improve the utilization of spectrum resource,so it is widely studied and used. Doppler frequency shift can destroy the orthogonality between the subcarriers of OFDM signal,which may cause the intercarrier interference（ICI）,and reduce the system performance greatly,so it′s important to estimate and compensate the Doppler frequency shift. An estimation algorithm of the Doppler frequency shift based on cyclic prefix is analyzed,and its simulation and performance analysis are conducted. An improvement scheme of the algorithm is proposed,simulated and compared with the algorithm before improvement in performance. The feasibility of the improvement scheme was verified.