Werner Haselmayr, Andreas Springer,
"Extrinsic LLR Computation by the SISO LMMSE Detector: Four Different Approaches"
: Proc. Int. Conf. Comput. Aided Syst. Theory 2015 (EUROCAST 2015), 2-2015
Extrinsic LLR Computation by the SISO LMMSE Detector: Four Different Approaches
Sprache des Titels:
Proc. Int. Conf. Comput. Aided Syst. Theory 2015 (EUROCAST 2015)
In this paper we present four different approaches for the computation of the extrinsic information by a soft-input soft-output LMMSE detector used in a turbo equalization system. Moreover, we show the equivalence of the four approaches. All methods apply a Gaussian approximation, but at different stages, e.g. Gaussian approximation on the LMMSE filter output. Each approach offers different strategies for reducing the computational complexity, where the factor graph approach is the most promising solution.