Buffer-Aided Collision Resolution for UHF RFID

Abstract

A buffer-aided collision resolution scheme for UHF RFID is proposed. The scheme uses buffers to store the collided signal, so collision resolution can be achieved through subtracting the identified signals from the corrupted signal stored in the buffer. Based on the buffer-aided collision resolution technique, a novel buffer-aided dynamic frame-slotted Aloha algorithm with the ability to resolve m-tag-collided slots (B-DFSA-m) is introduced. Simulations show that the system efficiencies of B-DFSA-m with the ability to resolve m = 2, 3, and 4-tag-collided slots are 55%, 64%, 66.5%, and their time efficiencies are 72%, 74%, and 75%. These system and time efficiencies compare favorably with the efficiencies of Q-algorithm, Schoute, MAPP, FEIA, and ILCM, BE-MDT, ds-DFSA, ABTSA, and DBTSA, which are the best previous collision resolution schemes for UHF RFID.