To master the technique for good short LDPC codes supporting fast encoding algorithm, please read my following published book, which provided many examples.
 Y. Xiao, Turbo and LDPC Codecs and their Applications, Press of Posts and Telecommunications, Beijing, 2010.
Two LDPC codes of DVB-s2 are too long, which lead to huge implementation complexity. Our published papers try to shorten them and keep their original good BER. This program shows that it is possible to get good short codes from the DVB-s2 LDPC.