11 extractmake LDPC编解码程序

代码说明：

ldpc的11个程序 encode decode extract make-gen make-ldpc make-pchk print-gen print-pchk rand-src transmit verify 共十一个程序，学习ldpc编码的重要资料-The 11 procedures LDPC encode decode extractmake-gen make-ldpc make-pchk print-genprint-pchk rand-src transmit verify a total of 11 procedures, learn important information LDPC coding