RFID Glossary

RFID Glossary : Reader collision occurs

2020-04-08 18:10:15 M&W SmartCard 31

Reader collision occurs in RFID systems when the coverage area of one RFID reader overlaps with that of another reader. This causes two different problems:

  • Signal interference
    The RF fields of two or more readers may overlap and interfere. This can be solved by having the readers programmed to read at fractionally different times. This technique (called time division multiple access - TDMA) can still result in the same tag being read twice.

  • Multiple reads of the same tag
    The problem here is that the same tag is read one time by each of the overlapping readers. The only solution is to program the RFID system to make sure that a given tag (with its unique ID number) is read only once in a session. 

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Index of related articles:

Active Tag (Active RFID Tag)
Amplitude Modulation (AM)
Antenna (RFID Tag Antenna)
Back scatter (RFID back scatter)
Contactless smart card
Chipless RFID tag
Contactless Credit Cards
Closed Systems (or Closed Loop Systems)
Code plate (RFID code plate)
Continuous Wave (CM)
Electromagnetic Interference (EMI)
Electronic Article Surveillance (EAS)
Electronic Product Code (EPC)
Error Correcting Code (ECC)
Error Correcting Mode
Error Correcting Protocol
Factory Programming
Field Programming
Frequency Modulation (FM)
Frequency Shift Keyed Modulation (FSKM)
Frequency Hopping
Inductive Coupling
Passive RFID Tag (or Passive Tag)
Phase Modulation (PM)
Pulse Duration
RF Fibers
RFID Reader
RFID Tag Collision
RFID tag
Smart label (RFID Smart Label)
RFID Reader Collision
Smart cards
Transponder for RFID

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