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arXiv 1502.07066cs.ITmath.IT
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捕获与干扰:一种用于安全AF中继的自维持友好干扰器范例

To Harvest and Jam: A Paradigm of Self-Sustaining Friendly Jammers for Secure AF Relaying

Hong Xing, Kai-Kit Wong, Zheng Chu, Arumugam Nallanathan

摘要:

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链路中断,多天线捕获和干扰辅助器的使用。我们的目标是最大限度地提高保密率在目的地的AF中继和HJ助手的发射功率约束。在理想信道状态信息(CSI)的情况下,利用半定松弛法(SDR)研究了协同干扰的人工噪声(AN)协方差矩阵和AF波束形成矩阵的联合优化问题,该方法具有较强的收敛性,同时也得到了复杂度较低的次优解。对于不完美的CSI的情况下,我们提供了等价的最坏情况下的鲁棒优化,以最大限度地提高最小可实现的保密率。受理想CSI情况下的最优解的启发,提出了一种次优鲁棒方案,该方案在复杂度和性能之间取得了良好的折衷。最后,提供了各种设置的数值结果来评估所提出的方案。

英文摘要:

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 semi-definite 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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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