A New Rfid Anti-Collision Technique Based On Time-Hopping Sub Slots Early Estimation

Tag collision is one of the most noteworthy issues of Radio frequency Identification (RFID) that affect the system efficiency and limit the fast redeployment of this technology. In this paper, a new efficient anti-collision method based on time-hopping sub-slots early estimation technique is proposed. The corresponding anti-collision algorithm is dubbed time-hopping sub-slots estimation Dynamic Framed Slotted Aloha (THSE-DFSA). In THSE-DFSA, the reader proposes an initial frame divided into N sub-nanosecond slots, where tags can randomly choose one sub-slot as theirs fist pulse response to be used subsequently for the estimation of the number of tags. In fact, the introduced time hopping estimation mechanism into numerous existing DFSA algorithms showed significant improvements in terms of system efficiency and the allocated identification time needed to identify all tags of the system. Simulation results show superior THSE-DFSA performance versus convolutional DFSA algorithms.