文中在发送数据前先发训练序列和导频序列，在接收端对接收到的信号进行信道估计，再将得到的信道信息来解调我们有用的信号(In this paper, the training sequence and pilot sequence are sent before sending the data, the received signal is estimated at the receiving end, and then the obtained channel information is used to demodulate our useful signal.)