The problems of LDPC codes in CCSDS 131.0-P-1.1

This program provided the parity check matrix of LDPC 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!