Novel EM-Based Channel Estimation Algorithm for MIMO-OFDM Systems

MIMO-OFDM is a promising technique for broadband communications over mobile wireless channel. In this paper, we investigate the channel estimation problem for MIMO-OFDM systems. We proposed a novel EM (expectation maximization)-based channel estimation method. This proposed method employs the poly-nomial channel model along with the EM-based algorithm and makes a tradeoff between the computational complexity and the performance of estimation accuracy. Computer simulations show that, compared with the traditional EM-based channel estimation, the novel method has a great advantage of estimation accuracy.