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arXiv 2005.07164cs.ITmath.IT
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环境反向散射通信中断性能研究

On the Outage Performance of Ambient Backscatter Communications

Yinghui Ye, Liqin Shi, Xiaoli Chu, Guangyue Lu

摘要:

环境反向散射通信(AmBackComs)已经被认为是物联网的频谱和能量高效技术,因为它允许无源反向散射设备(BD)将其信息调制成传统信号,例如,蜂窝信号,并将它们反射到它们相关联的接收机,同时从传统信号中收集能量以为其电路操作供电。然而,\color{black} AmBackComs的性能分析中,反向散射链路与传统链路之间的同信道干扰以及BD处的能量收集器的非线性行为在很大程度上被忽略。考虑到这两个方面,本文提供了一个全面的中断性能分析的AmBackCom系统与多个反向散射链路,其中一个反向散射链路是机会主义地选择利用在给定的资源块中发送的传统信号。对于任何选定的后向散射链路,我们提出了一个自适应反射系数(RC),这是适应于非线性能量收集(EH)模型和选定的后向散射链路的位置,以最大限度地减少中断概率的后向散射链路。为了研究同信道干扰对后向散射和传统链路的影响,对于选定的后向散射链路,我们推导出传统链路和后向散射链路的中断概率。此外,我们研究了最好的和最坏的中断性能的反向散射系统中所选择的反向散射链路的最大化或最小化的信号干扰噪声比(SINR)在反向散射接收机。我们还研究了传统链路的最佳和最差中断性能,其中所选择的反向散射链路导致对传统接收机的最低和最高同信道干扰。

英文摘要:

Ambient backscatter communications (AmBackComs) have been recognized as a spectrum- and energy-efficient technology for Internet of Things, as it allows passive backscatter devices (BDs) to modulate their information into the legacy signals, e.g., cellular signals, and reflect them to their associated receivers while harvesting energy from the legacy signals to power their circuit operation. {\color{black} However, the co-channel interference between the backscatter link and the legacy link and the non-linear behavior of energy harvesters at the BDs have largely been ignored in the performance analysis of AmBackComs. Taking these two aspects, this paper provides a comprehensive outage performance analysis for an AmBackCom system with multiple backscatter links}, where one of the backscatter links is opportunistically selected to leverage the legacy signals transmitted in a given resource block. For any selected backscatter link, we propose an adaptive reflection coefficient (RC), which is adapted to the non-linear energy harvesting (EH) model and the location of the selected backscatter link, to minimize the outage probability of the backscatter link. In order to study the impact of co-channel interference on both backscatter and legacy links, for a selected backscatter link, we derive the outage probabilities for the legacy link and the backscatter link. Furthermore, we study the best and worst outage performances for the backscatter system where the selected backscatter link maximizes or minimizes the signal-to-interference-plus noise ratio (SINR) at the backscatter receiver. We also study the best and worst outage performances for the legacy link where the selected backscatter link results in the lowest and highest co-channel interference to the legacy receiver, respectively.

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