A search algorithm to construct girth-8 quasi-cyclic LDLC
Yang Hai-yan · Journal of Chongqing University of Posts and Telecommunications · 2011
In order to find a kind of linear code with simple structure and approaching Shannon limit,based on the algorithm of constructing quasi-cyclic low density parity check(LDPC) codes and combined with the characteristic of low density lattice codes(LDLC),the LDLC with girth-8 through improving the algorithm was constructed.The new algorithm ensures the LDLC generating sequence distribute in each row or each column randomly and its uniformity in each row and each column.Meanwhile this article analyses the complexity of the algorithm.Simulation result in AWGN channel shows that the performance of girth-8 LDLC code using the proposed algorithm is better than the present girth-6 LDLC code.