An artificial fast fading generation scheme for physical layer security of MIMO-OFDM systems
An artificial fast fading generation scheme for physical layer security of MIMO-OFDM systems
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DOI：
10.1109/icspcs.2015.7391734
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发表时间：
2015-12
期刊：
影响因子：
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通讯作者：
Yu Kozai;T. Saba
中科院分区：
文献类型：
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作者：
Yu Kozai;T. Saba
人工快衰落（AFF）是实现安全通信的物理层安全方案之一。在AFF方案中，要发送的信号乘以一个随机权重，称为AFF权重。结果，诸如快衰落的影响被添加到发送信号中，并且窃听者的解调性能下降。相反，由于AFF权重被生成为通过发送器和合法接收器之间的信道的影响而被抵消，所以它不会降低合法接收器的解调性能。现有的AFF方案中，仅考虑单流传输。然而，目前的无线通信系统大多采用多流传输。在本文中，我们提出了一种采用正交频分复用（OFDM）的多输入多输出（MIMO）系统的AFF生成方案。仿真结果表明，我们的AFF生成方案产生的AFF在合法接收器处被成功抵消，并且合法接收器的互信息随着传输流的数量而增加。
Artificial fast fading (AFF) is one of the physical layer security schemes that achieve secure communications. In the AFF scheme, the signal to be transmitted is multiplied by a random weight which is called the AFF weight. As a result, the effect like fast fading is added to the transmitting signal, and the demodulation performance of an eavesdropper is degraded. In contrast, since the AFF weight is generated to be canceled out by the effect of channel between a transmitter and a legitimate receiver, it does not degrade the demodulation performance of the legitimate receiver. In the existing AFF scheme, only single-stream transmission is considered. However, recent wireless communications systems mostly adopt multiple-stream transmission. In this paper, we propose an AFF generation scheme for multiple-input multiple-output (MIMO) systems employing orthogonal frequency division multiplexing (OFDM). Simulation results show that the AFF produced by our AFF generation scheme is successfully canceled out at the legitimate receiver, and the mutual information of the legitimate receiver is increased along with the number of transmitted streams.