LOPES, C. D. R.; http://lattes.cnpq.br/8248434669451226; LOPES, Camila Duarte Rodrigues.
Resumo:
The constant technological advancement in areas such as identification, tracking and
sensing of processes and elements always looks for alternatives to increase speed and facilitate
the exchange of information. The radio frequency identification, known by its acronym in
English – RFID, although it’s not a new technology, has been pointed as a important alternative
in these areas, because of some attractive characteristics that other systems on the market do
not have. In this regard, efforts have been made in order to reduce production costs of the RFID
elements. As a result, a new strand of research related to RFID has emerged in recent years,
the use of tags that do not have integrated circuit. As these elements are the most numerous
of the system, this change would help to reduce the production costs substantially. However,
changing the tag’s architecture in this way, brings other issues to discussion, with the main
one relating to the communication signals between the elements and their problems, such as
the reading collisions in environments with more than one tag. From these issues, the main
objective of this work is to focus on the treatment of reading collisions for RFID systems with
tags which do not have chip and uses the spectral signature as a mean of encoding binary
information. As a tool for processing the signals involved in the communication system, its used
the Fractional Fourier Transform and its mathematical properties on the separation of colliding
signals and the concepts of minimum distance detection for recovery the binary information
from the previously separated signals. The method was simulated and produced the expected
results, with the effective separation of signals and satisfactory performance identifying tag’s
binary information.