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Fundamental Limits of Communication With Low Probability of Detection

机译:低检测概率的通信的基本限制

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This paper considers the problem of communication over a discrete memoryless channel (DMC) or an additive white Gaussian noise (AWGN) channel subject to the constraint that the probability that an adversary who observes the channel outputs can detect the communication is low. In particular, the relative entropy between the output distributions when a codeword is transmitted and when no input is provided to the channel must be sufficiently small. For a DMC whose output distribution induced by the “off” input symbol is not a mixture of the output distributions induced by other input symbols, it is shown that the maximum amount of information that can be transmitted under this criterion scales like the square root of the blocklength. The same is true for the AWGN channel. Exact expressions for the scaling constant are also derived.
机译:本文考虑了在离散无记忆信道(DMC)或加性高斯白噪声(AWGN)信道上进行通信的问题,该约束受制于观察者观察到该信道输出的对手可以检测到该通信的可能性很低的约束。特别地,当发送码字时和没有向信道提供输入时,输出分布之间的相对熵必须足够小。对于DMC,其“关闭”输入符号引起的输出分布不是其他输入符号引起的输出分布的混合,表明在此标准下可以传输的最大信息量按比例的平方根表示。块长。 AWGN频道也是如此。还导出了比例常数的精确表达式。

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