Abstract:

To solve the insufficient ideal filtering in the traditional channel estimation (CE) algorithm based on discrete Fourier transform (DFT), a novel CE algorithm based on DFT with the threshold and direct-decision in orthogonal frequency division multiplexing (OFDM) system is proposed, which filters out noise twice by the threshold-based CE method. Simulation results show that the proposed algorithm can improve the performance of CE at both high and low signal to noise ratios and the normalized mean square error (NMSE) is better than the traditional algorithms.