The gaussian two-way relay channel with wiretapper
The gaussian two-way relay channel with wiretapper
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DOI：
10.1109/acssc.2011.6190373
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发表时间：
2011-11
期刊：
影响因子：
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通讯作者：
Sungsoo Kim;Won-Yong Shin;K. Ishibashi
中科院分区：
文献类型：
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作者：
Sungsoo Kim;Won-Yong Shin;K. Ishibashi
分析了高斯双向中继窃听信道(TRWC)中的保密容量，其中两个合法源节点希望在有窃听者在场的情况下通过中继交换消息。我们假设所有预期的节点都以全双工模式运行，并且在两个源之间没有直接路径。在高斯TRWC中，我们提出了一种可实现的编码方案，该方案由具有结构码本和随机码本的叠加格码组成。在两个信源以及中继处进一步引入干扰策略，以最大化可实现的保密速率区域，其中每个节点分配其部分功率来干扰窃听者。我们的结果表明，即使在反向退化的情况下，也保持了正的可实现保密率。此外，假设两个信源具有相等的功率约束，在下行链路处于高信噪比的情况下，基于无保密约束的信道，该方案渐近达到离割集上界不到1/2比特。
Secrecy capacity is analyzed in a Gaussian two-way relay wiretap channel (TRWC), where two legitimate source nodes wish to exchange their messages through a relay in the presence of an eavesdropper. We assume that all intended nodes operate in full-duplex mode and there is no direct path between two sources. In the Gaussian TRWC, we propose an achievable coding scheme composed of superposed lattice codes with both structured and random codebooks. A jamming strategy is further introduced at the two sources as well as at the relay to maximize the achievable secrecy rate regions, where each node allocates part of its power to jam the eavesdropper. Our result indicates that positive achievable secrecy rates are maintained even for the reversely degraded scenario. In addition, assuming two sources with equal power constraint, it is shown that the scheme asymptotically achieves within 1/2 bit from the cut-set bound based on the channel with no secrecy constraints, as the downlink phase is in the high signal-to-noise ratio regime.