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首页> 外文期刊>International journal of communication systems >Cooperative beamforming of full-duplex relays for improving physical layer security
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Cooperative beamforming of full-duplex relays for improving physical layer security

机译：全双工中继的协作波束成形以提高物理层安全性

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In this paper, we consider secure communications of one source-destination pair in the presence of one eavesdropper, when full-duplex decode-and-forward cooperative relays operate to enhance physical layer security. While the conventional half-duplex relay receives the signal from the source and forwards the re-encoded signal to the destination in two separated time slots, the full-duplex relay (FDR) performs the transmission and reception at the same time, which can ideally double the secrecy capacity. However, because of the simultaneous transmission and reception, each FDR suffers from both its own self-interference and the interference from the other cooperative FDRs. When the conventional cooperative relaying schemes are used in full-duplex relaying, it is obviously expected that the self-interference signals cause severe degradation of the secrecy capacity. Here, we propose an iterative transmit power allocation and relay beamforming weight design scheme for cooperative FDRs to enhance the secrecy rate as well as suppress the self-interference signals. Numerical results present that the FDRs with the proposed scheme significantly improve the secrecy rate compared with the conventional half-duplex relays. Copyright (C) 2015 John Wiley & Sons, Ltd.
机译：在本文中，当全双工解码转发协作中继用于增强物理层安全性时，我们考虑存在一个窃听者时一对源-目的地对的安全通信。传统的半双工中继从源接收信号并在两个分开的时隙中将重新编码的信号转发到目的地，而全双工中继（FDR）同时执行发送和接收，这在理想情况下可以实现保密能力加倍。但是，由于同时进行发送和接收，每个FDR都遭受其自身的干扰以及来自其他协作FDR的干扰。当在全双工中继中使用传统的协作中继方案时，显然可以预期，自干扰信号会严重降低保密能力。在这里，我们提出了一种针对协作FDR的迭代发射功率分配和中继波束成形权重设计方案，以提高保密率并抑制自干扰信号。数值结果表明，与传统的半双工继电器相比，采用该方案的FDR显着提高了保密率。版权所有（C）2015 John Wiley＆Sons，Ltd.

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