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arXiv cs/0506091cs.ITmath.IT
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环上置换多项式构作LDPC码

A New Construction for LDPC Codes using Permutation Polynomials over Integer Rings

Oscar Y. Takeshita

摘要:

提出了一种利用有限整数环上的二次置换多项式构造低密度奇偶检验(LDPC)码的新方法。新码的相关图具有代数和伪随机性质,并且新码是准循环的。图同构和自同构的识别和使用在一个有效的搜索良好的代码。找到了围长为12的图,用解析和算法找到了最小汉明距离的上界。边界指示最小距离随着块长度而增长。近码字是导致LDPC码错误平层的原因之一,新构造为研究LDPC码近码字提供了一个很好的框架。文中给出了九个码例,计算机模拟结果表明,这些码具有优良的误码性能。最后,这种新的LDPC构造和Turbo码之间的连接使用二次置换多项式产生的交织器。

英文摘要:

A new construction is proposed for low density parity check (LDPC) codes using quadratic permutation polynomials over finite integer rings. The associated graphs for the new codes have both algebraic and pseudo-random nature, and the new codes are quasi-cyclic. Graph isomorphisms and automorphisms are identified and used in an efficient search for good codes. Graphs with girth as large as 12 were found. Upper bounds on the minimum Hamming distance are found both analytically and algorithmically. The bounds indicate that the minimum distance grows with block length. Near-codewords are one of the causes for error floors in LDPC codes; the new construction provides a good framework for studying near-codewords in LDPC codes. Nine example codes are given, and computer simulation results show the excellent error performance of these codes. Finally, connections are made between this new LDPC construction and turbo codes using interleavers generated by quadratic permutation polynomials.

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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