Method for inserting pilot frequency and estimating parameters of channel for equilibrium in frequency doman

The method makes multiple connections of data signal and pilot signal at the sending end of the communication system after mapping the coded modulation. Also the method makes the pilot signal appear at some frequency points only, and the data have no such frequency components. The circle prefix is added into each data block at the sending end, and the circle prefix is removed at the receiving endin order to eliminate interference between data blocks or between signals in frequency domain caused by time delay expand in multiple routes. Then, the channel parameter estimation at the corresponding frequency point is obtained by using the picked pilot signal in frequency domain. Base on the estimation at the said point, the channel parameter estimations for all frequency points are obtained by using the interpolation method. The invention has the advantages of simple algorithm and high accuracy for channel parameter estimation.