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Radio frequency identification (RFID) suffers from collisions when multiple tags respond in the same time. This paper presents Query Tree ALOHA (QTA) anti collision algorithm, improved by using a new tag estimation technique based on signal strength. In addition, by using this technique it is possible to detect when two tags remain in the identification tree and hence acknowledge these tags without...
The paper presents the design and development of a low cost chipless RFID system for secure near field data transfer. This system is ideal for use in credit cards and similar identification cards which are based on "data transfer by contact" which at present uses the conventional using integrated circuits (IC) or magnetic strips. The system consists of the design of a compatible low cost...
Radio frequency identification (RFID) is a wireless communication technology that provides automatic identification and data collection. In RFID systems with a large number of tags, many tags respond to the reader at the same time. Thus, enhanced anti-collision algorithms are required to have a fast multiple tag identification process. Anti-collision algorithms can be classified as probabilistic (eg...
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