研究了一种在循环前缀中插入四元序列的载波频偏估计方法。由于在循环前缀中添加的四元序列自身携带的相位信息丰富，因此可以利用其这一特点完成对载波频偏的估计。该方法实现简单，且不限制特定的调制方式，在基于循环前缀的OFDM系统上稍加改进即可实现本系统的设计，降低了系统实现的复杂度。通过仿真表明在信噪比大于16dB并且序列长度较短时，所提算法即可以满足系统对载波频偏估计的要求。%This paper studies the method of carrier frequency offset estimation based on the quaternary sequence inserted in cyclic prefix. Since the quaternary sequence inserted in cyclic prefix carry rich information of phase, this feature can be used to complete the carrier frequency offset estimate. The method is simple and not limited to special modulation modes. Therefore, the system can be achieved with slight improvement of the OFDM system based on cyclic prefix. It reduces the complexity of system implementation. Simulation results show that this method can fulfill the estimation of frequency offset when SNR is higher than 16dB and the sequence is short enough.
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