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A General Upper Bound on the Size of Constant-Weight Conflict-Avoiding Codes

机译:等重避免冲突代码大小的一般上限

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摘要

Conflict-avoiding codes are used in the multiple-access collision channel without feedback. The number of codewords in a conflict-avoiding code is the number of potential users that can be supported in the system. In this paper, a new upper bound on the size of constant-weight conflict-avoiding codes is proved. This upper bound is general in the sense that it is applicable to all code lengths and all Hamming weights. Several existing constructions for conflict-avoiding codes, which are known to be optimal for Hamming weights equal to four and five, are shown to be optimal for all Hamming weights in general.
机译:在多路访问冲突通道中使用避免冲突的代码,而无需反馈。避免冲突代码中的代码字数量是系统中可以支持的潜在用户数量。本文证明了恒定权重避免冲突代码的大小的新上限。从某种意义上说,此上限是通用的,它适用于所有代码长度和所有汉明权重。通常,已知有几种用于避免冲突的代码的构造对于所有等于4和5的汉明权重是最佳的,但对于所有汉明权重来说,它们都是最优的。

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