Secure Beamformer Designs in MU-MIMO Systems With Multiuser Interference Exploitation
Secure Beamformer Designs in MU-MIMO Systems With Multiuser Interference Exploitation
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DOI：
10.1109/tvt.2018.2841387
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发表时间：
2018-05
影响因子：
6.8
通讯作者：
Ming Li;Guangyu Ti;Li-Yu Daisy Liu
中科院分区：
文献类型：
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作者：
Ming Li;Guangyu Ti;Li-Yu Daisy Liu
近年来，物理层安全因其在防止机密信息泄露给窃听者方面的进步而引起了广泛关注。在本文中，我们重点关注多用户多输入多输出 (MU-MIMO) 系统中的安全波束形成器设计，其中多天线窃听器试图偷听特定用户的机密信息。与现有工作不同，我们的目标是利用固有的多用户干扰来破坏窃听者的接收并增强无线通信的安全性。特别是，利用实用的信号干扰噪声指标，安全波束形成器设计的目标是最大限度地减少窃听者的 SINR，同时为合法用户提供所需的预先指定的 SINR，以保证服务质量。我们分别在已知和未知窃听者信道的条件下，提出了下行链路和上行链路传输的安全波束形成器设计。使用所提出的安全波束形成器，多用户信号的行为类似于人工噪声或分布式友好干扰，这会进一步降低窃听者的接收效果。广泛的仿真研究证实了我们的分析性能预测，并说明了所提出的波束形成器设计对于安全 MU-MIMO 传输的优势。
Physical layer security has drawn significant attention in recent years because of its advancement in preventing confidential information leakage to eavesdroppers. In this paper, we focus on secure beamformer designs in multiuser multi-input multi-output (MU-MIMO) systems with a multi-antenna eavesdropper attempting to overhear the confidential information of a particular user. Unlike the existing work, we aim to exploit the inherent multi-user interference to disrupt the reception of the eavesdropper and enhance the security of wireless communications. Particularly, utilizing practical signal-to-interference-noise metrics, the objective of the secure beamformer design is to minimize the eavesdropper's SINR, while providing legitimate users with required prespecified SINRs to guarantee the qualify of service. We propose secure beamformer designs for both downlink and uplink transmissions, under the conditions of known and unknown eavesdropper's channels, respectively. With the proposed secure beamformers, the multiuser signal behaves like the artificial noise or distributed friendly jamming, which can further degrade the reception of the eavesdropper. Extensive simulation studies confirm our analytical performance predictions and illustrate the advantages of proposed beamformer designs for secure MU-MIMO transmissions.