Robust clipping demapper for LDPC decoding in impulsive channel

Low-Density Parity-Check codes, are a class of linear block codes and have recently received a great deal of attention owing to their excellent performances over Additive White Gaussian Noise channels. However they are not well investigated in non-Gaussian environments, for instance when the noise is impulsive. In this paper we discuss the use of clipping to mitigate the effect of impulsive noise modeled as an α-stable random variable. The slope in the linear section of the demapper and the threshold have a significant impact on the Belief Propagation decoder performance. We show that judicious choices of those parameters can result in an important performance improvement.