射频源累积能量下的物理层安全性

Shashibhushan Sharma, Sanjay Dhar Roy, S. Kundu
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引用次数: 0

摘要

在本文中,我们研究了解码和转发(DF)中继在几个帧上收集能量的积累,这些能量被中继用于在无源窃听者存在的情况下转发特定帧中的信号。信号源在广播阶段向DF中继发送信息信号。每个中继都有两个全向天线辅助,而源和目的都有一个全向天线辅助。所选中继使用从一个天线接收的信号来获取能量,同时使用从另一个天线接收的信号来解码消息。在中继中,每一帧通信中收集的能量可能不足以转发信号,这需要能量的积累。在中继阶段,几帧积累的能量足以使信号通过单个天线转发到特定帧中的目的地,而窃听者则试图窃听中继的信息信号。当所选择的中继使用累积的能量传输时,我们评估了所提出的网络中的保密中断概率,以确保物理层信息信号的安全。保密性能随信源发射功率的增加和用于能量积累的帧数的增加而增加。建立了收集能量积累下的保密中断概率的封闭表达式,并通过MATLAB仿真验证了该表达式的正确性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Physical Layer Security under Accumulated Harvested Energy from RF Source
In this paper, we have studied the accumulation of harvested energy, at decode and forward (DF) relays over several frames, which is used by the relays to forward the signal in a particular frame in presence of a passive eavesdropper. The source broadcasts the information signal to DF relays in the broadcasting phase. Each relay is assisted with two omnidirectional antennas, while the source and the destination is assisted with a single omnidirectional antenna. The selected relay uses the signal received from one antenna to harvest energy, while it uses the received signal from another antenna to decode the message. At the relay, the harvested energy in each frame of communication might not be sufficient to forward the signal, which requires accumulation of energy. The accumulated energy over several frames becomes sufficient to forward the signal to the destination in a particular frame through a single antenna in the relaying phase, while the eavesdropper tries to eavesdrop the relayed information signal. We evaluate the secrecy outage probability in the proposed network to secure the information signal at the physical layer when the selected relay transmits using accumulated harvested energy. The secrecy performance increases with an increase in transmit power of the source, and the number of the frames used for energy accumulation. A closed-form expression on secrecy outage probability under accumulation of harvested energy is developed which is verified by MATLAB based simulation.
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