LMMSE channel estimation with soft statistics for turbo-MIMO receivers

Authors:
Wooram Shin;Seung Joon Lee;Dong-Seung Kwon;Joonhyuk Kang
Affiliations:
Electronics and Telecommunications Research Institute, Daejeon, Korea;Department of Electrical & Electronic Engineering, Kangwon National University, Chuncheon, Korea;Electronics and Telecommunications Research Institute, Daejeon, Korea;Korea Advanced Institute of Science and Technology, Daejeon, Korea
Venue:
IEEE Communications Letters
Year:
2009

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Abstract

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. We 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.