Error floor properties of low-density parity-check codes using iterative decoding algorithms
Jianhua Lü · Journal of Tsinghua University(Science and Technology) · 2009
Error floor properties of low-density parity-check(LDPC)codes using different decoding algorithms were statistically analyzed utilizing test data from a hardware evaluation platform.The analysis shows that the number of residual error bits in an error codeword after decoding failure using the sum-product(SP)algorithm or the modified min-sum(MMS)algorithm is usually quite small;therefore,LDPC codes can serve as the inner code in a concatenated coding system to achieve an ultra low bit error rate.The analysis also shows that SP algorithm is more suitable for a concatenated coding system than MMS algorithm since less residual error bits occur when using the SP algorithm.Concatenated codes based on the analysis achieve bit error rates lower than 10-10 with a low decoding threshold.