Secrecy Capacity Optimization via Cooperative Relaying and Jamming for WANETs
Secrecy Capacity Optimization via Cooperative Relaying and Jamming for WANETs
复制标题
通过协作中继和干扰 WANET 的保密容量优化
DOI：
10.1109/tpds.2014.2316155
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发表时间：
2015-04-01
影响因子：
5.3
通讯作者：
Zhao, Baokang
中科院分区：
文献类型：
--
作者：
Han, Biao;Li, Jie;Zhao, Baokang
协作无线网络通过获取更准确、更及时的信息来提高系统的运行效率和可靠性，在实践中支持许多业务，引起了人们的极大关注。然而，安全协作通信问题还没有得到很好的研究。在本文中，我们利用物理层安全来为涉及多个源目的对和恶意窃听者的无线自组织网络(WANET)提供安全的协作通信。通过用保密容量来刻画系统的安全性能，研究了通过协作中继和协作干扰实现安全增强的保密容量优化问题。具体地说，我们提出了一种系统模型，在该模型中，一组中继节点可以被多个源-目的节点对利用来实现物理层安全。从理论上给出了继电保护分配问题的相应公式，并给出了在多项式时间内求解该问题的最优算法。为了进一步提高系统的保密容量，我们利用协作干扰技术，提出了一种智能干扰算法来干扰窃听信道。通过大量的实验，我们验证了我们提出的算法在各种网络环境下显著提高了系统的保密容量。
Cooperative wireless networking, which is promising in improving the system operation efficiency and reliability by acquiring more accurate and timely information, has attracted considerable attentions to support many services in practice. However, the problem of secure cooperative communication has not been well investigated yet. In this paper, we exploit physical layer security to provide secure cooperative communication for wireless ad hoc networks (WANETs) where involve multiple source-destination pairs and malicious eavesdroppers. By characterizing the security performance of the system by secrecy capacity, we study the secrecy capacity optimization problem in which security enhancement is achieved via cooperative relaying and cooperative jamming. Specifically, we propose a system model where a set of relay nodes can be exploited by multiple source-destination pairs to achieve physical layer security. We theoretically present a corresponding formulation for the relay assignment problem and develop an optimal algorithm to solve it in polynomial time. To further increase the system secrecy capacity, we exploit the cooperative jamming technique and propose a smart jamming algorithm to interfere the eavesdropping channels. Through extensive experiments, we validate that our proposed algorithms significantly increase the system secrecy capacity under various network settings.