LMMSE turbo equalization based on factor graphs

@article{Guo2008LMMSETE,
  title={LMMSE turbo equalization based on factor graphs},
  author={Qinghua Guo and Li Ping},
  journal={IEEE Journal on Selected Areas in Communications},
  year={2008},
  volume={26}
}
In this paper, a vector-form factor graph representation is derived for intersymbol interference (ISI) channels. The resultant graphs have a tree-structure that avoids the short cycle problem in existing graph approaches. Based on a joint Gaussian approximation, we establish a connection between the LLR (log-likelihood ratio) estimator for a linear system driven by binary inputs and the LMMSE (linear minimum mean-square error) estimator for a linear system driven by Gaussian inputs. This… CONTINUE READING
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