Analysis and characterization of the backscatter-link frequency in passive UHF-RFID systems

Abstract

[ES] La tecnología de identificación por radiofrecuencia (RFID) es clave para la visualización de cada objeto en el marco de la Internet de las Cosas. Y más concretamente, la tecnología pasiva es la más extendida e implantada, ya que un lector puede identificar multitud de etiquetas en un corto periodo de tiempo. Cada etiqueta responde al lector a través de una subportadora denominada Frecuencia de Enlace por Retro-dispersión (Backscatter-Link Frequency, BLF). Con el objetivo de caracterizar este parámetro, en este artículo se emplea un conjunto de pruebas para evaluar la aleatoriedad de valores de BLF medidos y obtenidos de etiquetas comerciales. Los resultados muestran grandes variaciones de este parámetro respecto al primer valor esperado por el lector, así como durante el proceso de comunicación. Este comportamiento puede ser aprovechado como una característica diferenciadora de cada etiqueta y puede emplearse en los procesos de comunicación u otros fines. Consiguiendo, en definitiva, e[EN] Radio-frequency identification technology (RFID) is key for the  visualization of each object in the Internet of Things framework. Specifically, passive technology is the most widespread type of the worldwide implemented systems, due to a reader can identify multitude of tags in a short period of time. Each tag responds to the reader at a subcarrier called Backscatter-Link Frequency (BLF). In order to characterize this parameter, a set of tests has been used in this paper to assess the randomness of measured BLF values from commercial tags. The results show great variations of this parameter comparing with the first expected value in the reader, as well as during the communication process. This behavior can be used as a distinguishing feature of each tag, in communication processes or for other purposes. 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