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LMMSE channel estimation with soft statistics for turbo-MIMO receivers

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4 Author(s)
W. Shin ; Electronics and Telecommunications Research Institute, Daejeon 305-700, Korea (e-mail: {w.shin, dskwon}@etri.re.kr). ; S. Joon Lee ; D. -S. Kwon ; J. Kang

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.

Published in:

IEEE Communications Letters  (Volume:13 ,  Issue: 8 )