Nikos Kanistras Vassilis Paliouras Impact of roundoff error on the decisions of the Log Sum-Product algorithm for LDPC decoding. 100-105 2008 SiPS http://dx.doi.org/10.1109/SIPS.2008.4671745 conf/sips/2008 db/conf/sips/sips2008.html#KanistrasP08