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arXiv 2006.00191cs.ITmath.IT
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带ADC的高斯窃听信道的秘密容量总是正的

Secrecy Capacity of a Gaussian Wiretap Channel With ADCs is Always Positive

Seung-Hyun Nam, Si-Hyeon Lee

摘要:

我们考虑一个复杂的高斯窃听信道,在合法的接收器和窃听器的有限分辨率模数转换器(ADC)。对于这个通道,我们表明,一个积极的保密率总是可以实现的,只要在合法的接收机和窃听者的信道增益是不同的,无论ADC的量化水平。对于可互换性,我们首先考虑合法接收器处的1位ADC的情况,并应用二进制输入分布,其中当合法接收器处的信道增益小于窃听器处的信道增益时,两个输入点具有相同的相位,否则具有相反的相位。然后,通过适当地转换输入分布,将结果推广到合法接收器处的任意有限分辨率ADC的情况。对于真实高斯窃听信道的特殊情况下,在合法的接收器和窃听器的一位ADC,我们表明,我们的输入分布的选择满足Wyner码的最佳分布的必要条件。

英文摘要:

We consider a complex Gaussian wiretap channel with finite-resolution analog-to-digital converters (ADCs) at both the legitimate receiver and the eavesdropper. For this channel, we show that a positive secrecy rate is always achievable as long as the channel gains at the legitimate receiver and at the eavesdropper are different, regardless of the quantization levels of the ADCs. For the achievability, we first consider the case of one-bit ADCs at the legitimate receiver and apply a binary input distribution where the two input points have the same phase when the channel gain at the legitimate receiver is less than that at the eavesdropper, and otherwise the opposite phase. Then the result is generalized for the case of arbitrary finite-resolution ADCs at the legitimate receiver by translating the input distribution appropriately. For the special case of the real Gaussian wiretap channel with one-bit ADCs at both the legitimate receiver and the eavesdropper, we show that our choice of input distribution satisfies a necessary condition of optimal distributions for Wyner codes.

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