A soft-in soft-out detection approach using partial Gaussian approximation
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Guo, Q.
Fang, L.
Huang, D.
Nordholm, Sven
Date
2012Type
Conference Paper
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Guo, Q. and Fang, L. and Huang, D. and Nordholm, S. 2012. A soft-in soft-out detection approach using partial Gaussian approximation, in 2012 International Conference on Wireless Communications & Signal Processing (WCSP). IEEE.
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2012 International Conference on Wireless Communications and Signal Processing, WCSP 2012
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Department of Electrical and Computer Engineering
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Abstract
This paper concerns the implementation of the soft-in soft-out detector in an iterative detection system. A detection approach is proposed based on the properties of Gaussian functions. In this approach, for the computation of the APP (a posteriori probability) of a concerned symbol, the other symbols are distinguished based on their contributions to the APP of the concerned symbol, and the symbols with less contributions are treated as Gaussian variables to reduce the computational complexity. The exact APP detector and the well-known LMMSE (linear minimum mean square error) detector are two special cases of the proposed detector. Simulation results show that the proposed detector can significantly outperform the LMMSE detector, and achieve a good trade-off between complexity and performance. © 2012 IEEE.
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