In this correspondence, we consider an amplify-and-forward relay network in which relayed information is overheard by an eavesdropper. In order to confound the eavesdropper, a wireless-powered jammer is also considered which harvests energy from a multiple-antenna source. We proposed a new secure beamforming scheme in which beamforming vector is a linear combination of the energy beamforming (EB) and information beamforming (IB) vectors. We also present a new closed-form solution for the proposed beamforming vector which is shown to achieve a higher secrecy rate as compared to the trivial EB and IB vectors. Moreover, a tight closed-form approximation for the ergodic secrecy rate is also derived for the asymptotic regime of a large number of antennas at the source. Finally, numerical examples and simulations are provided which validate our analytical results.

中文翻译：

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具有无线供电干扰器的放大转发中继网络的安全波束成形和遍历保密率分析

在此对应关系中，我们考虑了一个放大转发中继网络，其中中继信息被窃听者窃听。为了迷惑窃听者，还考虑使用无线供电干扰器，从多天线源收集能量。我们提出了一种新的安全波束成形方案，其中波束成形向量是能量波束成形 (EB) 和信息波束成形 (IB) 向量的线性组合。我们还为所提出的波束成形向量提出了一种新的封闭形式的解决方案，与普通的 EB 和 IB 向量相比，该解决方案显示出更高的保密率。此外，对于源处大量天线的渐近机制，也推导出了遍历保密率的严格封闭形式近似值。最后，