a method of channel estimation of a mobile communication system based on a time division pilot field is disclosed . the method uses a transmitting end that transmits a time division pilot sequence having a cyclic prefix and a receiving end that transforms the time division pilot sequence into frequency domain using a fast fourier transform module . channel estimation is performed to obtain a channel frequency response estimation result . the receiving end transforms the channel frequency response estimation result back into time domain and obtains a channel impulse response estimation result .