Performance Analysis for Ambient Backscatter Communications With Hybrid Long-Short Packets
Performance Analysis for Ambient Backscatter Communications With Hybrid Long-Short Packets
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DOI：
10.1109/lwc.2024.3369067
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发表时间：
2024-05
影响因子：
6.3
通讯作者：
Jiayao Shi;Liqin Shi;Yinghui Ye;Yuzhi Zhang;Xiaoli Chu
中科院分区：
文献类型：
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作者：
Jiayao Shi;Liqin Shi;Yinghui Ye;Yuzhi Zhang;Xiaoli Chu
这封信研究了具有混合长短数据包的环境反向散射通信 (AmBackCom) 网络的性能，其中长数据包用于蜂窝传输，而多个物联网 (IoT) 节点轮流通过反向散射通信 (BackCom) 反向散射短数据包。考虑到每个物联网节点的能量因果关系约束以及 BackCom 和蜂窝传输之间的联合解码误差，我们推导了每个物联网节点 BackCom 的块错误率（BLER）的封闭式表达式，以及蜂窝传输中断概率的上下界。仿真结果验证了推导表达式的正确性，并展示了关键参数对BackCom BLER和蜂窝传输中断性能的影响。具体来说，存在一个最佳功率反射系数，使所有物联网节点的平均BLER最小化，并且平均BLER随着短包块长度的增加而减小，直到达到某个值。此外，蜂窝传输的中断概率受到导出的上限和下限的良好限制，当长分组数据比特增加时，上限和下限变得更严格。
This letter studies the perfermance of an ambient backscatter communication (AmBackCom) network with hybrid long and short packets, where long packets are used for the cellular transmission while multiple Internet-of-Things (IoT) nodes take turns to backscatter short packets via backscatter communication (BackCom). Considering the energy causality constraint of each IoT node and the joint decoding error between BackCom and the cellular transmission, we derive the closed-form expressions of the block error rate (BLER) for each IoT node’s BackCom, as well as the upper and lower bounds of the outage probability for the cellular transmission. Simulation results verify the correctness of the derived expressions and show the impacts of key parameters on the BLER of BackCom and the outage performance of the cellular transmission. Specifically, there exists an optimal power reflection coefficient that minimizes the average BLER of all the IoT nodes and the average BLER decreases with the short-packet blocklength until it reaches a certain value. Besides, the outage probability of the cellular transmission is well bounded by the derived upper and lower bounds, which become tighter when the long-packet data bits increase.