Channel estimation optimizing method for amplitude-limiting OFDM system

The disclosed optimization method separates data signal from pilot signal, which pass through sign extension portion and IFFT portion respectively. The data portion passes through clipping module then. Optimizing process module carries out optimizing process for data signal. The purpose of the optimizing process is to eliminate influence on the pilot signal by the clipping operation. FFT is carried out for data after self-adapting amplitude limiting in advance so as to convert signal in time domain into signal in frequency domain. Afterwards, the signal in frequency domain passes through module for limiting and eliminating amplitude of noise. Finally, the method superposes the portion of optimizing processed data signal with the portion of pilot signal, and outputs the superposed signal. Through iterative algorithm, the invention reduces influence on the pilot signal caused by amplitude-limited noise, raises precision for estimating channel so as to raise transmission performance.