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Application of full duplex guarantees secure wireless communication

机译：全双工的应用保证了安全的无线通信

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摘要

This paper proposes an amplify-and-forward (AF) based scheme for full duplex systems to realize secure wireless communication between two nodes over block fading medium. The paper consider all four possible scenarios: Multiple-input and multipleoutput (MIMO), multiple-input and single-output (MISO), singleinput andmulti-output (SIMO), and single-input and single-output (SISO) systems. We first devise communication protocol of the scheme that does not bring additional communication cost. The core of the protocol is amplify-and-forward process, in which artificial noise sent by the receiver is amplified and retransmitted by the transmitter with information signal back to the receiver. Since the receiver has the knowledge of the noise, the artificial noise only degrades the eavesdropper. Then, we present the form of the artificial noise for the four scenarios respectively. Thereafter, we derive the closed form expressions of secrecy capacity, and reformulate them irrelevant to the channel of the eavesdropper. This makes our scheme valid when the transmitter does not know any information about the eavesdropper. We investigate the solution for the secrecy capacity optimization problem in SISO scenario at first, which can be extended to SIMO, MISO, and MIMO systems. The optimization problems are easy to solve and have analytical solutions. Numerical results are presented to show the validation of our scheme.
机译：本文提出了一种基于放大转发（AF）的全双工系统方案，以通过块衰落介质实现两个节点之间的安全无线通信。本文考虑了所有四种可能的情况：多输入和多输出（MIMO），多输入和单输出（MISO），单输入和多输出（SIMO）以及单输入和单输出（SISO）系统。我们首先设计不带来额外通信成本的方案的通信协议。该协议的核心是放大和转发过程，其中，将接收器发送的人为噪声放大，然后由发送器将其与信息信号一起转发回接收器。由于接收者了解噪声，因此人造噪声只会使窃听者的声音变差。然后，我们分别介绍四种情况下的人工噪声形式。此后，我们得出保密能力的封闭形式，并重新构造它们与窃听者的渠道无关。当发射机不知道有关窃听者的任何信息时，这使我们的方案有效。首先，我们研究了针对SISO场景中的保密容量优化问题的解决方案，该解决方案可以扩展到SIMO，MISO和MIMO系统。优化问题易于解决，并且具有解析性解决方案。数值结果表明了该方案的有效性。

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