Method for Detecting the Collision of Multiple RFID Tags
A method for detecting collision of multiple RFID(Radio Frequency Identification) tags is proposed and implemented in a RFID reader compliant with the ISO/IEC18000-6C standard.The collision flag for RFID tags are generated by the decode module of the digital receiver of RFID reader through detecting the received signals' violations against the data encoding principals specified in the RFID standard.According to the test results,the precision of the proposed method is up to 99 percent,which makes it a reliable foundation for the implementation of ALOHA-based anti-collision algorithms in RFID readers.After adopting the proposed collision detection method in several anti-collision algorithms for multiple RFID tags,the test result shows that the identification throughput of RFID reader can be improved about 30~40 percent on average.