最后，论文以ARAPA原模图ldpc码为分量码，结合多级编码调制(MLC)技术，设计了一种兼顾带宽和功率效率的编码调制系统。

Finally, a multilevel coding (MLC) scheme with ARAPA protograph LDPC codes as component codes is designed. This scheme takes both bandwidth and power efficiency into account.

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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.

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