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arXiv 1503.06900cs.ITmath.IT
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一类新的部分几何及其相关的LDPC码

New Classes of Partial Geometries and Their Associated LDPC Codes

Qiuju Diao, Juane Li, Shu Lin, Ian Blake

摘要:

使用部分几何结构来构造LDPC码的奇偶校验矩阵已经导致了在低至$10^{-15}$的出错率下具有接近香农容量的错误概率的成功码的设计。这些考虑促使我们进行进一步的调查。给出了一类具有拟循环结构的部分几何的一种新的简单构造,并研究了它们的性质。部分几何代码的捕获集先前被认为是使用底层结构的几何方面来导出关于允许的捕获集的大小的信息。在此进一步审议这一专题。最后,部分几何和强正则图之间有一种自然的联系。这种图的邻接矩阵的特征值是众所周知的,并且确定从部分几何导出的任何Tanner图对于某些参数集是否是良好的扩展器是有意义的,因为可以认为具有良好几何和扩展特性的代码在消息传递解码下可能表现良好。

英文摘要:

The use of partial geometries to construct parity-check matrices for LDPC codes has resulted in the design of successful codes with a probability of error close to the Shannon capacity at bit error rates down to $10^{-15}$. Such considerations have motivated this further investigation. A new and simple construction of a type of partial geometries with quasi-cyclic structure is given and their properties are investigated. The trapping sets of the partial geometry codes were considered previously using the geometric aspects of the underlying structure to derive information on the size of allowable trapping sets. This topic is further considered here. Finally, there is a natural relationship between partial geometries and strongly regular graphs. The eigenvalues of the adjacency matrices of such graphs are well known and it is of interest to determine if any of the Tanner graphs derived from the partial geometries are good expanders for certain parameter sets, since it can be argued that codes with good geometric and expansion properties might perform well under message-passing decoding.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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