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In this paper, we study the optimal detection of QAM signaling with channel estimation error. Optimal detectors, Maximum Likelihood (MaxLike) detector and a Modified Minimum Distance (ModDist) detector, are derived for the case of a known Gaussian channel distribution and unknown channel distribution, respectively. These detectors differ from the traditional minimum distance detector which ignores the effect of channel estimation error. Soft decision metrics for coded performance are alsodoi:10.1109/icc.2003.1204040 dblp:conf/icc/Xiao03a fatcat:scfyjwg6kbd7lkb2j7g2dzsjvu