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An analysis of the timed Z-channel

机译:定时Z通道分析

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Golomb analyzed the Z-channel, a memoryless channel with two input symbols and two output symbols, where one of the input symbols is transmitted with noise while the other is transmitted without noise, and the output symbol transmission times are equal. We generalize to the timed Z-channel, where the output symbol transmission times are not equal. The timed Z-channel appears as the basis for a large class of covert (communication) channels appearing in multilevel secure computer systems. We give a detailed mathematical analysis of the timed Z-channel and report a result expressing the capacity of the timed Z-channel as the log of the root of a characteristic equation. This generalizes Shannon's work on noiseless channels for this special case. We also report a new result bounding the timed Z-channel's capacity from below. We show how an interesting observation that Golomb reported for the Z-channel also holds for the timed Z-channel.
机译:Golomb分析了Z通道,这是一个具有两个输入符号和两个输出符号的无记忆通道,其中一个输入符号以噪声传输,而另一个则以无噪声传输,并且输出符号传输时间相等。我们推广到定时Z通道,其中输出符号传输时间不相等。定时的Z通道是出现在多层安全计算机系统中的大量隐蔽(通信)通道的基础。我们对定时Z通道进行了详细的数学分析,并报告了将定时Z通道的容量表示为特征方程根的对数的结果。对于这种特殊情况,这概括了香农在无噪声通道上的工作。我们还从下面报告了一个新的结果,该结果限制了定时Z通道的容量。我们展示了Golomb报告的有关Z通道的有趣观察结果如何也适用于定时Z通道。

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