Iterative MMSE channel estimation method based on AR model

The invention belongs to the technical field of OFDM communication, and particularly relates to an iterative MMSE channel estimation method based on an AR model. The method comprises the following steps: firstly, solving an autocorrelation sequence of a channel in a frequency domain and an estimation error variance of an AR model by utilizing AR modeling according to channel estimation at a pilot frequency, then forming a covariance matrix in a Toeplitz form and the estimation error variance by utilizing the autocorrelation sequence, carrying out MMSE estimation on the channel, and then carrying out AR modeling again by utilizing the channel obtained by estimation. And updating the covariance matrix and the variance of the estimation error, solving the MMSE channel estimation again, and iteratively carrying out the steps until the noise power is converged, so as to obtain a final estimation channel. Simulation results show that even if channel synchronization is imperfect, the method provided by the invention