LMMSE Channel Estimation With Soft Statistics for Turbo-MIMO Receivers

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Channel estimation techniques for turbo multiple-input multiple-output receivers are addressed, which exploit a priori information to refine the poor performance of initial channel estimates solely using training symbols. The authors study Linear Minimum Mean Squared Error Channel Estimation (LMMSE-CE) using second-order soft statistics to incorporate the degree of decoding reliability. Utilizing this additional information effectively minimizes the error propagation which the Maximum Likelihood based expectation maximization Channel Estimation (ML-CE) suffers. The LMMSE-CE provides a smaller mean square error of channel estimation and block error rate than the ML-CE.