Error floor behavior study of LDPC codes for concatenated codes design
Weigang Chen, Liuguo Yin, Jianhua Lü · Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE · 2007
Error floor behavior of low-density parity-check (LDPC) codes using quantized decoding algorithms is statistically studied with experimental results on a hardware evaluation platform. The results present the distribution of the residual errors after decoding failure and reveal that the number of residual error bits in a codeword is usually very small using quantized sum-product (SP) algorithm. Therefore, LDPC code may serve as the inner code in a concatenated coding system with a high code rate outer code and thus an ultra low error floor can be achieved. This conclusion is also verified by the experimental results.