中文说明：
本代码对OFDM中载波频偏对系统误码率的影响进行了全面的仿真和比较，对加深对OFDM载波同步技术的理解很有帮助。
English Description：
This code makes a comprehensive simulation and comparison of the influence of carrier frequency offset on BER in OFDM system, which is helpful to deepen the understanding of OFDM Carrier Synchronization Technology