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Hybrid relaying and jamming for secure two-way relay networks with per-node power constraint

机译:具有按节点功率约束的安全双向中继网络的混合中继和干扰

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Cooperative relaying and jamming are two efficient schemes to improve the physical-layer security of a wireless transmission in the presence of an eavesdropper. In this paper, we propose a hybrid cooperative relaying and jamming mechanism to enhance the security of a two-way relay network, where some intermediate nodes adopt distributed beamforming to improve the channel quality to legitimate terminals and others jam the eavesdropper, simultaneously. Subjected to the more practical per-node power constraint of each cooperative node, we propose a secrecy scheme to maximize the secrecy sum rate of the two terminals. It is shown that the problem can be transformed into a semi-definite programming (SDP) problem with an additional rank-1 constraint. We then propose a penalty function method and an iterative algorithm to solve such a problem efficiently, instead of the popular semi-definite relaxation (SDR) and randomization technique in the previous literature. Simulations show that the proposed hybrid schemes greatly improve the security of the two-way relay networks.
机译:协作中继和干扰是两种有效的方案,可以在有窃听者的情况下提高无线传输的物理层安全性。在本文中,我们提出了一种混合协作中继和干扰机制,以增强双向中继网络的安全性,其中一些中间节点采用分布式波束成形来提高到合法终端的信道质量,而其他一些中间节点则同时干扰窃听者。根据每个协作节点的更实际的每节点功率约束,我们提出了一种保密方案,以最大化两个终端的保密和率。结果表明,该问题可以转换为具有附加等级1约束的半定规划(SDP)问题。然后,我们提出了一种罚函数方法和一种迭代算法来有效解决该问题,而不是先前文献中流行的半定性松弛(SDR)和随机化技术。仿真表明,提出的混合方案大大提高了双向中继网络的安全性。

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