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arXiv 1607.04525cs.ITmath.IT
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分层网络中的安全模拟网络编码

Secure Analog Network Coding in Layered Networks

Tulika Agrawal, Samar Agnihotri

摘要:

我们考虑一类高斯分层网络,其中源与目的地通过$L$中间中继层与$N$节点在每一层中的存在下,一个单一的窃听者,可以偷听在任何一层中的节点的传输。考虑了在有向链路的分层无线中继网络中,采用模拟网络编码进行单播通信时,可获得的最大保密率问题。执行模拟网络编码的中继节点缩放并转发在其输入处接收的信号。这项工作的关键贡献是一个引理,提供了一组全局最优的缩放因子的节点,最大限度地提高了端到端的保密率的一类分层网络。我们还表明,在高信噪比制度,ANC实现保密率在一个恒定的间隙的割集上界的保密能力。据我们所知,这项工作提供了第一个表征的安全ANC在多层网络中的窃听者的存在下的性能。

英文摘要:

We consider a class of Gaussian layered networks where a source communicates with a destination through $L$ intermediate relay layers with $N$ nodes in each layer in the presence of a single eavesdropper which can overhear the transmissions of the nodes in any one layer. The problem of maximum secrecy rate achievable with analog network coding for a unicast communication over such layered wireless relay networks with directed links is considered. A relay node performing analog network coding scales and forwards the signals received at its input. The key contribution of this work is a lemma that provides the globally optimal set of scaling factors for the nodes that maximizes the end-to-end secrecy rate for a class of layered networks. We also show that in the high-SNR regime, ANC achieves secrecy rates within a constant gap of the cutset upper bound on the secrecy capacity. To the best of our knowledge, this work offers the first characterization of the performance of secure ANC in multi-layered networks in the presence of an eavesdropper.

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