Clipping demapper for LDPC decoding in impulsive channel

Abstract : This paper deals with the performance of Low-Density Parity-Check codes in impulsive interference modeled by α-stable random variables. In case of α-stable noise, the optimal inputs of the belief propagation decoder are complex to obtain. We propose to use the simple clipping approach that reduces the impact of large noise values. Our main contribution is to give three different approaches to obtain the parameters of the clipping function and to assess the performance of the decoder. We show that a look-up table whose values are pre-determined, thanks to the Density Evolution tool, is the most efficient approach.
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Hassen Benmaad, Alban Goupil, Laurent Clavier, Guillaume Gelle. Clipping demapper for LDPC decoding in impulsive channel. IEEE Communications Letters, Institute of Electrical and Electronics Engineers, 2013, 17 (5), pp.968-971. ⟨10.1109/LCOMM.2013.031913.130060⟩. ⟨hal-00851898⟩

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