We propose a new transmit antenna selection (TAS) technique that can be beneficial for physical layer security purposes. Specifically, we show that the conventional TAS criterion based on the legitimate channel state information (CSI) is not recommended when the average signal-to-noise ratio for the illegitimate user becomes comparable or superior to that of the legitimate user. We illustrate that an eavesdropper's based antenna selection technique outperforms conventional TAS, without explicit knowledge of the eavesdropper's instantaneous CSI. Analytical expressions and simulation results to support this comparison are given, showing how this new TAS scheme is a better choice in scenarios with a strong eavesdropper.
翻译:我们建议一种新的传输天线选择技术(TAS)可用于物理层安全目的。 具体地说,我们表明,当非法用户的平均信号对噪音比率与合法用户的信号对噪音比率相同或更高时,不建议基于合法频道状态信息的常规TAS标准。 我们举例说明,以窃听器为基础的天线选择技术优于常规TAS,没有明确了解窃听器即时的CSI。 为支持这一比较,我们给出了分析表达和模拟结果,表明在有强大的窃听器的情况下,这个新的TAS计划如何是更好的选择。