A Designing Method of LDPC Encoder Based on Algorithm Sequence
Wu Xiaoxiao · Dianzi xuebao · 2007
This paper defines a D-vector and D-matrix,based on which a new ensemble of LDPC code,called as D-LDPC codes,is developed.We discover that the D-matrix has the characteristics of orthogonality and circular-shift,by means of which we construct sparse parity-check matrix based on algorithm sequence.Studying shows that the D-LDPC codes has many advantages,such as the performance of the D-LDPC code is as same as,or in some extent,much better than convolution codes at the condition of middle and low code length and 1/2 code rate;the complexity of the algorithm to encode a D-LDPC code is O(M) which is lower than O(N) of the complexity for the convolution codes;the D-LDPC code has high flexibility concerning design of code length and code rate,which makes it compatible with the existed standard.