ofdm基本原理及同步技术的研究，利用CP相关性，对ML算法和迭代ML算法进行了仿真，通过误码率的变化观察频偏估计对于系统的影响。-The basic principles and research ofdm synchronization technology, the use of CP correlation algorithm for ML and ML iterative algorithm for the simulation, the estimated impact of the system offset by changes observed error rate.