The problems of LDPC codes in CCSDS 131.0-P-1.1
We found that the generator matrix in Fig.6-2 to be wrong, Bi,j's are not circulant. You can not derive circulant Bi,j's from the parity check matrix in Fig.6-1.
There are two vital problems in the LDPC codes of CCSDS 131.0-P-1.1:
(1) the parity check matrix in Fig.6-1 is not full rank;
(2) the generator matrix in Fig.6-2 is wrong, which are not circulant.
To check our comments for the CCSDS 131.0-P-1.1 codes, you only construct the generator matrix in Fig.6-2, then multiply the transpose of the the parity check matrix in GF(2) provided by our program. You will find that the product in GF(2) is not zero!
Cite As
Yang Xiao (2024). The problems of LDPC codes in CCSDS 131.0-P-1.1 (https://www.mathworks.com/matlabcentral/fileexchange/26382-the-problems-of-ldpc-codes-in-ccsds-131-0-p-1-1), MATLAB Central File Exchange. Retrieved .
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