MIMO-OFDM system will become the core technology of the4G,but the frequency synchronization is one of the problems to be solved.In most of the traditional blind synchronization algorithms,it is difficult to make a choice between precision and complexity.In view of the low precision of LS algorithms,a new frequency synchronization method based on the MMSE(minimum mean square error) algorithm is proposed,and the comparison between its performances and that of the LS(Least Square) algorithm is also made.The simulation results show that under the same signal-to-noise ratio,the MMSE algorithm can get lower bit error rate and mean square error than the LS algorithm.%MIMO-OFDM技术将成为4G的核心技术,但其频率同步问题是必须要解决的问题之一。传统的盲同步算法中,大多在精确度和复杂度之间很难取舍。针对LS（最小二乘）算法精确度不高的问题,提出了一种新的基于MMSE（最小均方误差）算法的频率同步方法,并与LS算法的性能进行了比较。仿真结果表明,在同样的信噪比下,MMSE算法能得到比LS算法更低的误码率和均方误差。
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