A major problem with RFID systems is that a tag might not be read, in spite of being in the reader’s range, due to collisions[4]. A collision is said to have occurred when various devices interfere with each others’ operations, or their simultaneous operations lead to loss of data. The reading process is not efficient due to various types of collisions, which are classified as follows :- • Single Reader-Multiple Tags collision : Multiple tags are present to communicate with the reader. They respond simultaneously and reader is not able to interpret the signal. • Single Tag-Multiple Readers collision : Single tag is in the range of two or more readers. Tags are mainly passive entities, they do not have enough power to differentiate between frequency range of the readers. • Reader-Reader interference : Two or more readers within the same frequency range interfere with each others’ operations.

Improving RFID Efficiently.pdf

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