Strongly conflict-avoiding codes are used in the asynchronous multiple-access collision channel without feedback. The number of code words in a strongly conflict-avoiding code is the number of potential users that can be supported in the system. In this paper, an upper bound on the size of strongly conflict-avoiding centered codes is obtained. This bound is further shown to be fight for some cases by direct constructions.%强避免冲突码适用于无反馈异步多址冲突信道,码中所包含的码字的个数称为码的容量,它是系统中所支持的潜在用户的个数.给出了重量为3的强避免冲突中心码容量上限.进一步通过直接构造,证明了某些码类容量能达到上限.
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