On Ergodic Secrecy Capacity of Random Wireless Networks With Protected Zones
On Ergodic Secrecy Capacity of Random Wireless Networks With Protected Zones
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DOI：
10.1109/tvt.2015.2477315
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发表时间：
2016-08
影响因子：
6.8
通讯作者：
Weigang Liu;Z. Ding;T. Ratnarajah;J. Xue
中科院分区：
文献类型：
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作者：
Weigang Liu;Z. Ding;T. Ratnarajah;J. Xue
在本文中，我们研究了随机无线网络中的物理层安全，其中合法节点和窃听节点都是随机部署的。在第一个场景中，我们研究了源节点周围没有保护区的基本随机网络。推导了同时具有衰落和路径损耗的复合信道增益的概率密度函数，并用于计算安全连接概率和遍历保密容量。在第二个场景中，我们考虑在源节点周围使用保密保护区来增强噪声限制网络中的安全性。在这里，我们研究以下两种情况：1)窃听者知道保密保护区，2)窃听者不知道保密保护区。此外，还给出了原始节点到秘密保护区外的随机节点之间的距离的分布。在最后一个场景中，合法接收者周围的干扰者保护区被用来通过重组干扰来提高物理层安全性。通过蒙特卡罗模拟验证了分析结果的正确性。结果表明，在不同的系统参数下，采用保密和干扰保护可以显著提高系统的安全性。
In this paper, we investigate physical-layer security in a random wireless network where both legitimate and eavesdropping nodes are randomly deployed. In the first scenario, we study the basic random network without a protected zone around the source node. The probability density functions (pdfs) for the composite channel gain with both fading and path loss is derived and used to calculate the probability of secure connection and ergodic secrecy capacity. In the second scenario, we consider the use of secrecy protected zone around the source node to enhance the security in a noise-limited network. Here, we study the following two cases: 1) The eavesdroppers are aware of the secrecy protected zone, and 2) the eavesdroppers are unaware of the secrecy protected zone. Moreover, the distribution of the distances between the origin and random nodes outside the secrecy protected zone is derived. In the final scenario, the interferer protected zones around the legitimate receivers are used to improve the physical-layer security by restructuring the interference. The derived analytical results are verified by the Monte Carlo simulations. It is shown that the application of secrecy and interferer protected zones lead to significant improvement in security, depending on different system parameters.