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In Radio-Frequency IDentification (RFID) systems, tag collision resolution is a significant issue for fast tag identification. Dynamic Framed Slotted ALOHA (DFSA) is one of the most widely used algorithms to resolve tag collision. Collision Detection (CD) plays an important role in determining the efficiency of DFSA-based algorithms because most DFSA-based algorithms determine the next frame size according to the number of collided slots in the current frame. Existing CD methods do not respond quickly enough to detect a collision and have difficulty in distinguishing a collision from noise, resulting in a degradation of system efficiency.
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