说明：  本程序提供了无4环和6环的LDPC好码设计算法。 使用者对照程序前言中的参考文献，可以迅速理解并掌握无4环和6环的LDPC好码的设计技术。
(This procedure provides a non-4 ring and 6 ring good LDPC code design algorithm. Foreword to the user control procedures of references, you can quickly understand and grasp the non-4 ring and 6 ring good LDPC code design techniques.)