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Negligible Cooperation: Contrasting the Maximal- and Average-Error Cases

机译:可忽略的合作:对比最大和平均误差案例

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In communication networks, cooperative strategies are coding schemes where network nodes work together to improve performance metrics such as the total rate delivered across the network. This work studies encoder cooperation in the setting of a discrete multiple access channel (MAC) with two encoders and a single decoder. A network node, here called the cooperation facilitator (CF), that is connected to both encoders via rate-limited links, enables the cooperation strategy. Previous work by the authors presents two classes of MACs: (i) one class where the average-error sum-capacity has an infinite derivative in the limit where CF output link capacities approach zero, and (ii) a second class of MACs where the maximal-error sum-capacity is not continuous at the point where the output link capacities of the CF equal zero. This work contrasts the power of the CF in the maximal- and average-error cases, showing that a constant number of bits communicated over the CF output link can yield a positive gain in the maximal-error sum-capacity, while a far greater number of bits, even a number that grows sublinearly in the blocklength, can never yield a non-negligible gain in the average-error sum-capacity.
机译:在通信网络中,合作策略是编码方案,网络节点一起工作,以改善诸如网络上传送的总速率等性能度量。该工作研究编码器在具有两个编码器和单个解码器的离散多接入通道(MAC)的设置中的编码器合作。通过限速链路连接到两个编码器的合作辅导员(CF),网络节点称为合作辅助程序(CF),可以实现合作策略。以前的工作由作者呈现了两类MAC:(i)平均误差总和 - 容量在限制中具有无限衍生的一类,其中CF输出链路容量接近零,并且(ii)第二类Mac最大误差总和容量在CF等于零的输出链路容量的点处不连续。这项工作对比最大和平均误差情况下CF的功率,示出了通过CF输出链路传送的恒定数量可以在最大误差和容量中产生正增益,而数量远远超过位,即使是在块长度中延长的数字,也永远不会产生平均误差总和的不可忽略的增益。

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