To Harvest and Jam: A Paradigm of Self-Sustaining Friendly Jammers for Secure AF Relaying
To Harvest and Jam: A Paradigm of Self-Sustaining Friendly Jammers for Secure AF Relaying
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DOI：
10.1109/tsp.2015.2477800
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发表时间：
2015-12-15
影响因子：
5.4
通讯作者：
Nallanathan, Arumugam
中科院分区：
文献类型：
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作者：
Xing, Hong;Wong, Kai-Kit;Nallanathan, Arumugam
本文研究了在多天线放大转发中继窃听信道中，假设源端和目的端之间的直接连接被破坏的情况下，多天线收获干扰（HJ）辅助器的使用。我们的目标是在AF中继和HJ助手的发射功率限制下最大化目的地的保密率。在完美信道状态信息（CSI）条件下，采用紧致的半定松弛（SDR）方法研究了协同干扰人工噪声（AN）协方差矩阵与自动对射波束形成矩阵的联合优化问题，并设计了复杂度较低的次优解。对于不完全CSI情况，我们提供了等效的最坏情况鲁棒优化公式，以最大化最小可实现保密率。受完美CSI情况的最优解的启发，提出了一种兼顾复杂性和性能的次优鲁棒方案。最后，给出了不同设置下的数值结果来评价所提出的方案。
This paper studies the use of multi-antenna harvest-and-jam (HJ) helpers in a multi-antenna amplify-and-forward (AF) relay wiretap channel assuming that the direct link between the source and destination is broken. Our objective is to maximize the secrecy rate at the destination subject to the transmit power constraints of the AF relay and the HJ helpers. In the case of perfect channel state information (CSI), the joint optimization of the artificial noise (AN) covariance matrix for cooperative jamming and the AF beamforming matrix is studied using semidefinite relaxation (SDR) which is tight, while suboptimal solutions are also devised with lower complexity. For the imperfect CSI case, we provide the equivalent reformulation of the worst-case robust optimization to maximize the minimum achievable secrecy rate. Inspired by the optimal solution to the case of perfect CSI, a suboptimal robust scheme is proposed striking a good tradeoff between complexity and performance. Finally, numerical results for various settings are provided to evaluate the proposed schemes.