Potential and Practical Limits of Time-Domain Reflectometry Chipless RFID
Potential and Practical Limits of Time-Domain Reflectometry Chipless RFID
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DOI：
10.1109/tmtt.2016.2593722
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发表时间：
2016-09-01
影响因子：
4.3
通讯作者：
Vossiek, Martin
中科院分区：
文献类型：
--
作者：
Poepperl, Maximilian;Parr, Andreas;Vossiek, Martin
本文对无芯片时域反射计 (TDR) 射频识别 (RFID) 的最大可能信息内容和读取范围进行了基本分析。需要考虑标签上编码的位以及阅读器可以解码的位来估计标签上的信息内容。这需要一种处理整个 RFID 系统的方法。插入损耗、读取器信号、读取范围和通道属性等因素会影响读取器可解码的位数。单独考虑这些参数，我们可以通过雷达理论方程（例如 Cramer-Rao 下界）对解码器处的信号属性进行建模。这些系统的整体性能无法用雷达理论来令人满意地描述，因为当今的无芯片 RFID 系统使用不同的调制方案来增加信息内容。调制理论可以根据信道和信号属性提供调制方案的详细分析。该理论影响标签设计和解码器上的解调算法，但不适合描述整个 RFID 系统。本文提供了一种结合雷达和调制理论的方法，对无芯片 TDR RFID 通信进行详尽的描述。通过这种分析可以估计实践中可获得的最大信息内容。所介绍的方法适用于表面声波和基于超宽带延迟线的 TDR 标签。我们展示了使用不同标签进行的模拟和测量，以显示理论发现的实际重要性。
This paper provides a fundamental analysis of the maximum possible information content and reading range of chipless time-domain reflectometry (TDR) radio frequency identification (RFID). Bits encoded on a tag as well as bits that can be decoded by the reader need to be considered to estimate the information content on a tag. This needs an approach that deals with the entire RFID system. Factors such as insertion loss, reader signal, reading range, and channel properties impact the number of bits that can be decoded by the reader. Taking these parameters into account on their own, we can model the signal properties at the decoder by equations from radar theory such as the Cramer-Rao lower bound. The overall performance of these systems cannot be satisfactorily described by the radar theory, as today's chipless RFID systems use different modulation schemes to increase the information content. Modulation theory can provide a detailed analysis of the modulation schemes depending on the channel and signal properties. This theory influences the tag design and the demodulation algorithms on the decoder, but is not suited to describe the RFID systems as a whole. This paper provides an approach that combines the radar and modulation theories to provide an exhaustive description of chipless TDR RFID communication. The maximum information content obtainable in practice can be estimated with this analysis. The introduced methodology is applied to surface-acoustic wave and ultra-wideband delay-line-based TDR tags. We present the simulations and measurements taken with different tags to show the practical importance of the theoretical findings.