Secrecy Performance of Backscatter Communications With Multiple Self-Powered Tags
Secrecy Performance of Backscatter Communications With Multiple Self-Powered Tags
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DOI：
10.1109/lcomm.2022.3201031
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发表时间：
2022-12-01
期刊：
影响因子：
--
通讯作者：
Sun, Haijian
中科院分区：
文献类型：
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作者：
Liu, Zhipeng;Ye, Yinghui;Sun, Haijian
反向散射通信（BackCom）网络容易遭受窃听，然而其保密性能尚未得到充分研究。在本文中，我们针对存在窃听者的多标签自供电BackCom网络提出一种标签选择策略，以同时优化遍历保密容量（ESC）和保密中断概率（SOP）。具体而言，首先设计一种自适应功率反射系数方案，以使每个标签的瞬时保密容量最大化，在此基础上选择具有最高保密容量的标签来反向散射消息。为了评估所得到的保密性能，我们首先得到在独立但非同分布的Nakagami - $m$衰落信道下瞬时保密容量的精确累积分布函数，然后分别推导遍历保密容量和保密中断概率。仿真结果验证了理论分析，并表明所提出的策略优于现有策略。
Backscatter communication (BackCom) networks are vulnerable to eavesdropping, while its secrecy performance has not been sufficiently studied. In this letter, we propose a tag selection strategy to optimize the ergodic secrecy capacity (ESC) and the secrecy outage probability (SOP) simultaneously for a multi-tag self-powered BackCom network in the presence of an eavesdropper. Concretely, an adaptive power reflection coefficient scheme is first designed to maximize the instantaneous secrecy capacity per tag, based on which the one with the highest secrecy capacity is selected to backscatter message. To evaluate the resulting secrecy performance, we first obtain the exact cumulative distribution function of the instantaneous secrecy capacity under independent but non-identically distributed Nakagami- $m$ fading channels, and then derive the ESC and the SOP, respectively. Simulation results validate the theoretical analyses and demonstrate that the proposed strategy is superior to the existing strategies.