To deal with the noise thresholds of LDPC codes,the density evolutionary algorithm based on belief propagation algorithm is discussed to determine the thresholds through simplifying the message iterative arithmetic on the means of the check nodes which can reduce the computing complexity and the amount of computation.Three different degree distribution LDPC codes have been constructed,and the theoretical calculation and simulation have been carried on to determine the noise variance thresholds and the SNR thresholds under AWGN channel,the results have been compared.It shows that with the increase of the column weight,the performance of LDPC codes becomes worse.Excellent performance can be obtained if we choose good numbers of degree distribution,that has guiding significance for further application research of LDPC codes.
YIN Xiaoqi
. Thresholds of regular LDPC codes based on density evolution algorithm[J]. Journal of Hebei University(Natural Science Edition), 2016
, 36(3)
: 332
-336
.
DOI: 10.3969/j.issn.1000-1565.2016.03.018
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