Iterative Channel Estimation based on Linear Regression for a MIMO-OFDM system

Multiple-input multiple-output (MIMO) systems combined with orthogonal frequency-division multiplexing (OFDM) receive a great deal of attention due to its great potential in achieving high data rates in wireless communications. Nevertheless for coherent detection systems, performance of these MIMO-OFDM systems can severely degrade due to inaccurate channel estimation especially over frequency-selective fast-varying channels. In this paper, we address a MIMO-OFDM coherent transmission with a pilot aided turbo channel estimation improved by addition of a linear regression algorithm in the iterative process. The efficiency of the proposed channel estimation is demonstrated over fast time varying channels thanks to comparison with other turbo-channel estimation systems