Abstract: A novel MIMO-OFDM channel estimation algorithm is proposed by exploiting the sparsity property of channel impulse response.At first,the matching pursuit idea is used to detect the position of the nonzero tap coefficients,then the least square algorithm is utilized to estimate the exact value of the nonzero coefficients,so as to reduce the computational complexity of the algorithm by decreasing the numbers of the channel parameters being estimated.This algorithm has good performance,but the update of the residue vector is not exact,another algorithm called MIMO-MMP is acquired by modifying the mode of the residue vector update,MIMO-MMP algorithm has better performance.Simulation results demonstrate the validity of the algorithm.