A New Quasi-Random LDPC Convolutional Codes and Window Decoding
Peng Wan-qua · Dianzi xuebao · 2014
Using column permutation,number setting,cutting and merging,a new( l,3,6) quasi-random LDPC convolutional codes is derived from Gallager LDPC block code. Aiming at this codes,the paper advances a windowed decoding,which the size of window sash is invariable and sliding step is optional,and it can considerably reduce the size of the register and decoding delay. The simulation defines the value range of sliding step and confirms the effectiveness of the construction method and windowed decoding,and also tests the BER performance of quasi-random LDPC convolutional codes with different constraint degrees. The results show that l = 1535 can obtain an error-correcting ability about 1 dB from the capacity limit.