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Optimal strongly conflict-avoiding codes of even length and weight three

机译:长度和重量均三的最佳避免强烈冲突的代码

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Strongly conflict-avoiding codes (SCACs) are employed in a slot-asynchronous multiple-access collision channel without feedback to guarantee that each active user can send at least one packet successfully in the worst case within a fixed period of time. By the assumption that all users are assigned distinct codewords, the number of codewords in an SCAC is equal to the number of potential users that can be supported. SCACs have different combinatorial structure compared with conflict-avoiding codes (CACs) due to additional collisions incurred by partially overlapped transmissions. In this paper, we establish upper bounds on the size of SCACs of even length and weight three. Furthermore, it is shown that some optimal CACs can be used to construct optimal SCACs of weight three.
机译:在无反馈的时隙异步多路访问冲突信道中采用了强烈避免冲突的代码(SCAC),以确保每个活动用户可以在固定的时间段内在最坏的情况下成功发送至少一个数据包。通过假定为所有用户分配了不同的代码字,SCAC中的代码字数量等于可以支持的潜在用户数量。与SCAC相比,SCAC具有不同的组合结构,这是由于部分重叠的传输引起了额外的冲突。在本文中,我们确定了长度和重量为三的SCAC大小的上限。此外,表明可以使用一些最佳CAC来构建权重为3的最佳SCAC。

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