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arXiv 0902.2235cs.ITmath.IT
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关于卷积码的等距

On Isometries for Convolutional Codes

Heide Gluesing-Luerssen

摘要:

本文将讨论卷积码的等距和强等距。等距是保权模同构,而强等距是保度模同构。这些映射的特殊情况是某些类型的单项变换。我们将证明麦克威廉斯等价定理的一种形式,即卷积码之间的每一个等距都是由一个单项变换给出的。例子表明,强等距不能用这种方法来刻画,但特别注意的重量邻接矩阵允许进一步的描述。各种距离参数出现在文献中的卷积码也将讨论。

英文摘要:

In this paper we will discuss isometries and strong isometries for convolutional codes. Isometries are weight-preserving module isomorphisms whereas strong isometries are, in addition, degree-preserving. Special cases of these maps are certain types of monomial transformations. We will show a form of MacWilliams Equivalence Theorem, that is, each isometry between convolutional codes is given by a monomial transformation. Examples show that strong isometries cannot be characterized this way, but special attention paid to the weight adjacency matrices allows for further descriptions. Various distance parameters appearing in the literature on convolutional codes will be discussed as well.

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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