Improved MAP channel estimation algorithm for MIMO-OFDM systems under angle domain

This paper proposes an improved Maximum a posteriori probability (IMAP) algorithm for the estimation of frequency-selective channels in MIMO-OFDM systems. To further mean square error (MSE) performance and reduce the training overhead during MAP channel estimation, joint estimation is carried out over multiple OFDM symbols firstly. Then, according to the idea that MIMO channels in angle domain can be assumed to be independently. Most significant taps (MST) technique in angle domain is used to improve the MSE performance of MAP algorithm. Simulation results indicate the effectiveness of the proposed algorithm.