In offset quadrature amplitude modulation/orthogonal frequency division（ OQAM/OFDM） systems

frequency channel estimation method exist error code leveling problem in high frequency selective channel

time domain channel estimation method is proposed. Time domain channel estimation model for OQAM/OFDM systems is set up

the channel covariance matrix is obtained through the iterative method

a linear minimum mean square error（ LMMSE） channel estimation method which needn’t a priori information of channel covariance matrix is obtained. The simulation result shows that the proposed methods can effectively overcome error code leveling and improve the channel estimation performance to 5 dB compared with the weighted least squares（ WLS） channel estimation and have a close performance with the LMMSE channel estimation method which has a priori information of channel covariance matrix.