RFID physical layer collision recovery receivers with spatial filtering
RFID physical layer collision recovery receivers with spatial filtering
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DOI：
10.1109/rfid-ta.2015.7379795
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发表时间：
2015-09
期刊：
影响因子：
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通讯作者：
J. Kaitovic;M. Rupp
中科院分区：
文献类型：
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作者：
J. Kaitovic;M. Rupp
在这篇文章中，我们关注的是提高多天线射频识别(RFID)系统的吞吐量。提出了一种基于空间滤波的物理层冲突恢复接收机。我们的目标是通过对接收到的信号进行后处理并消除来自特定到达方向的标签来减少碰撞中涉及的标签数量。为了实现这一点，我们将读取器的区域划分为扇区，并分别在每个扇区中使用不同的角度衰减执行碰撞恢复。此外，我们还推导了一个考虑空间滤波器特性和吞吐量的半解析公式，并在此基础上预测了最优的帧大小。通过仿真分析了该方法对系统性能的影响，并与符合EPC标准的阅读器的性能进行了比较。与我们提出的方法相比，标签查询时间大大缩短，系统吞吐量得到了很大的提高。
In this paper, we focus on a throughput increase in multiantenna Radio Frequency Identification (RFID) systems. We propose a physical layer collision recovery receiver with spatial filtering. Our goal is to decrease the number of tags involved in a collision by postprocessing received signals and cancelling tags from certain directions of arrival. To achieve this, we divide the reader's area in sectors and we perform a collision recovery with different angular attenuations in each sector separately. Furthermore, we derive a semi-analytical formula that takes into account properties of a spatial filter and the throughput, and based on that we predict the optimal frame size. The influence of the proposed method on the system performance is analysed by means of simulations and compared with the performance of an EPC standard compliant reader. When comparing with our proposed method, the tag interrogation time is considerably shortened through which a large gain in the system throughput is achieved.