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LMMSE Channel Estimation with Soft Statistics for Turbo-MIMO Receivers
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- Authors
- Woo Ram Shin, Seung Joon Lee, Dong Seung Kwon, Joon Hyuk Kang
- Issue Date
- 2009-08
- Citation
- IEEE Communications Letters, v.13, no.8, pp.585-587
- ISSN
- 1089-7798
- Publisher
- IEEE
- Language
- English
- Type
- Journal Article
- Abstract
- Channel estimation techniques for turbo multipleinput 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. © 2009 IEEE.