A New Channel Estimation Algorithm for Time-Varying Multi-Path Channel in MIMO-OFDM Systems

In order to improve the reliability of channel communication in MIMO-OFDM systems, this paper proposes a channel estimation algorithm which can be adopted in situations with time-varying multi-path effect. In our study, the channel estimation is obtained based on the least squares (LS) method of the optimal pilots, and then further improve the performance of the rough estimate by autoregressive (AR) model prediction and decision-directed (DD). As channel time-varying rapidly, this research use the correction factor to improve the algorithm so that the proposed algorithm can be applied to this scene. The simulation results demonstrate that our proposed channel estimation algorithm outperforms the existing algorithms without increasing the number and the power of pilots.