RA codes, IRA codes, ARA codes and its nested codes, which are the subclasses of LDPC codes, their protographs, encoding structures and threshold characteristics are given.

研究LDPC码的原模图设计及构造方法，给出LDPC码的子类：RA码、IRA码、ARA码及其嵌套码的原模图表示、编码结构及阈值特性。

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For example, if the grammar were to allow nested markup codes, this recursive style would probably be used.

例如，如果一种语法中允许嵌套标记代码，或许可以使用这种递归风格。

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