Simulation and measurements of physical layer parameters for passive UHF RFID tags toward collision detection and canceling

Radio-Frequency IDentification (RFID) is anenabling and emergent technology. Nowadays it still remains several challenging research issues beforeits widespread implementation, especially in dense environment. One of the main problems that limit the efficiency of passive UHF RFID system is the collision between the tags. Current solutions are based on collision avoidance using Media Access Control (MAC) Protocols (e.g. Frame Slotted Aloha, Binary Tree algorithms), whichcan be time consuming process because when a collision is detected, the retransmission of RN16 frame is required and all the signals in the physical layer are discarded. This paper presentsan experimental and simulation study of physical layer parameters for passive UHF RFID tags. Physical characteristics of the backscatter tag´s (Modulation type, signal encoding, datatransfert rate and power Tag activation) are used in order to detect collision. This preliminary work shows the influence of these parameters and their impact on the collision phenomenon.