Chapter 3
Physical Theory of RFID System Physical
Anti-Collision
Radio-frequency identification (RFID) technology is a wireless communication technology that enables users to uniquely identify tagged objects or people. An RFID
tag is mainly composed of antenna, chip, and Integrated Circuit (IC). The reliability
of the RFID tag refers to be read completely under prescribed conditions. Once
exceeding the normal environmental conditions (temperature, humidity, and so on),
RFID tags could be read difficultly or have poor reading performance because of
drifted threshold voltage, long delay time, and inferior noise tolerance [1, 2].
In practical applications, radio-frequency identification (RFID) systems are
susceptible to various factors (metals, liquids, temperature, etc.). This chapter takes
the reading distance of the tag as the evaluation standard of the reading performance
of the RFID system, focusing on the influence of different factors on the dynamic
performance of the UHF RFID system. First, an experimental system includes a
temperature control system and a detection platform designed to control the temperature and measure the reading distance of the RFID tag, and test the effect of different
temperatures on the performance of the tag. Secondly, a theoretical formula for
calculating the reading distance of RFID in salt fog and humidity environments is
proposed. An RFID dynamic identification experiment platform based on salt fog and
humidity environment was designed and established. The relationship between salt
fog, humidity, and RFID reading distance was established by fitting experimental
data. Finally, a test method for performance evaluation and optimization of radio
frequency identification and multiple input multiple output (RFID-MIMO) systems
based on Cramer–Rao boundary (CRB) is studied. The effect of the distribution of
multiple tags in the RFID-MIMO system on reading performance is analyzed.
© Science Press 2021
X. Yu et al., Physical Anti-Collision in RFID Systems,
https://doi.org/10.1007/978-981-16-0835-3_3
59
Physical Theory of RFID System Physical
Anti-Collision
Radio-frequency identification (RFID) technology is a wireless communication technology that enables users to uniquely identify tagged objects or people. An RFID
tag is mainly composed of antenna, chip, and Integrated Circuit (IC). The reliability
of the RFID tag refers to be read completely under prescribed conditions. Once
exceeding the normal environmental conditions (temperature, humidity, and so on),
RFID tags could be read difficultly or have poor reading performance because of
drifted threshold voltage, long delay time, and inferior noise tolerance [1, 2].
In practical applications, radio-frequency identification (RFID) systems are
susceptible to various factors (metals, liquids, temperature, etc.). This chapter takes
the reading distance of the tag as the evaluation standard of the reading performance
of the RFID system, focusing on the influence of different factors on the dynamic
performance of the UHF RFID system. First, an experimental system includes a
temperature control system and a detection platform designed to control the temperature and measure the reading distance of the RFID tag, and test the effect of different
temperatures on the performance of the tag. Secondly, a theoretical formula for
calculating the reading distance of RFID in salt fog and humidity environments is
proposed. An RFID dynamic identification experiment platform based on salt fog and
humidity environment was designed and established. The relationship between salt
fog, humidity, and RFID reading distance was established by fitting experimental
data. Finally, a test method for performance evaluation and optimization of radio
frequency identification and multiple input multiple output (RFID-MIMO) systems
based on Cramer–Rao boundary (CRB) is studied. The effect of the distribution of
multiple tags in the RFID-MIMO system on reading performance is analyzed.
© Science Press 2021
X. Yu et al., Physical Anti-Collision in RFID Systems,
https://doi.org/10.1007/978-981-16-0835-3_3
59