Title :
Matched median filter as detector for QAM signals
Author :
Liu, Qin ; Astola, Jaabko ; Neuvo, Y.
Author_Institution :
Dept. of Electr. Eng., Tampere Univ. of Technol., Finland
Abstract :
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
Keywords :
amplitude modulation; error statistics; filtering and prediction theory; matched filters; signal detection; QAM signal detection; computer simulation; detection error probability; extended matched filters; impulsive noise; linear matched filter; matched median filter; maximum likelihood criterion; quadrative amplitude modulation; robustness property; Amplitude modulation; Computer simulation; Detectors; Error probability; Matched filters; Maximum likelihood detection; Noise robustness; Quadrature amplitude modulation; Signal detection; Working environment noise;
Conference_Titel :
Circuits and Systems, 1991., IEEE International Sympoisum on
Print_ISBN :
0-7803-0050-5
DOI :
10.1109/ISCAS.1991.176282
