Mobility

Robust Channel Tracking in Fast Fading MIMO Channels

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Executive Summary

Channel estimation for Alamouti Space Frequency Coded (ASFC) 2?2 and 2?1 MIMO OFDM systems, employing Decision Directed Channel Tracking (DDCT) for high fade rates and long frame durations is studied here. Errors in the regression matrix (i.e., equalisation errors) have a Gaussian distribution, but due to error propagation problem of DDCT at high fade rates and long symbol durations, large deviations from the Gaussian model is observed. Hence, the problem of channel estimation can be formulated as an outlier contaminated Gaussian linear regression problem. Most of the classical estimators like Least Squares (LS) and Expectation Maximisation (EM) algorithm perform poorly in presence of outliers.

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