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。
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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