Matched median filter as detector for QAM signals
Q. Liu, Jaakko T. Astola, Yrjo A. Neuvo · 1991
The complex matched median filter (MMF) is developed under the maximum likelihood criterion for QAM (quadrative amplitude modulation) signal detection. It is shown that the MMF has the so-called robustness property similar to median filters in the case of impulsive noise. Based on the combination of the MMF and the linear matched filter (LMF), extended matched filters are also introduced. These filters have properties of both MMF and LMF and behave well in a varying environment. Computer simulations demonstrate that the proposed detectors give a smaller detection error probability than the LMF when impulsive noise is present.>