Melhoria do desempenho de sistemas RFID UHF passivos utilizando códigos de singularização.

Abstract

With the RFID tags quantity growth in practical applications, several issues, such as collisions - event in which two or more tags transmit signals simultaneously -, have their effects reinforced, what results in an increase of identification delays and significant energy losses during the communication process. Thus, the use of efficient identification protocols constitutes one of the main challenges for designing of these systems. Classical methods are implemented assuming that the information in the collision signal must be discarded. This work uses a different approach, in which collsions are the basis of a method of information recovery for passive RFID tags in the UHF range. The concept of singulation codes is reviewed and a identification protocol that uses these structures is investigated. Results obtained through simulations have been shown a decrease in the total time identification and an increase in the throughput for scenarios with high density of tags compared to two ALOHA-based methods.