Research and simulate of the optimization anti-collision technology in UHF RFID system

The technique of RFID (Radio Frequency Identification) as a perfect combine of wireless communications and automatically identifies, it can be thought of the most promising IT technologies at present. The most familiar problem in the UHF RFID system is Read and write collision. In UHF RFID system, we generally adopt improved ALOHA protocol and the tree algorithm to avoid collision. However, when increasing amount of the data and the number of tags, the effects are still not very satisfactory. In this text, reference to O-ALOHA (Optimality ALOHA), put forward the method of tags number estimated that merger reliability of derivative DRCTE (derivative reliabilities combined tag estimation) and combine with O-ALOHA arithmetic, first adopt DRCTE to estimate the number of labels, then aim at the number which had been already known, adopt O-ALOHA arithmetic to read, so it can solve O-ALOHA arithmetic accuracy problem when reading a great deal of labels. After simulation, this arithmetic can improve the reading accuracy of O-ALOHA arithmetic effectively with a great deal of labels.