中文说明：本文的OFDM信号在无线通信中会受到多普勒频移的影响，从而影响了OFDM信号的正交性，引起载波间的干扰和OFDM信号符号间的干扰，本代码先形成含有N个二进制码元的信号，而这个信号的千把女部分和后半部分的信号是一样的，然后根据把这个信号调制成OFDM信号，最后接收端根据这个OFDM信号估计出多普勒因子
English Description：
OFDM signals in a wireless communication herein will be Doppler shift influence, thus affecting the orthogonality of the OFDM signal, the OFDM signal causing interference between symbols and interference between carriers, the code comprising forming a first N binary code element signal, and this signal thousand female portion and the rear half of the signal is the same, then according to this OFDM signal to estimate the Doppler factor according to the signal modulated into OFDM signals, and finally the receiver