Although RFID(Radio Frequency Identification

RFID) is capable of identifying multiple tags synchronously

the tag collision occurs inevitably when a large number of tags respond in the induction area of reader simultaneously

which seriously influences the throughput of RFID system because signal aliasing arises from tags occupying the channel randomly.In order to further improve the throughput of RFID system

this paper proposes a new anti-collision algorithm with adjusting inventory cycle by the preset difference threshold

the slot checking forward

the slot predicting backward and the slot binary splitting

which are coordinately combined to deal with the response of the current slot and the next slot when algorithm complexity and hardware are not added in tags.In the algorithm

the preset difference threshold can prevent reader from floating point computation.Meanwhile

the methods of slot checking forward and predicting backward are joined together to judge the response of the current slot and the next slot in advance

which can skip the current idle slot and the next idle slot

and split the tags responding in the current collision slot and the next collision slot in real time.In the following three simulation experiments

ways of inventory cycle adjustment

methods of slot splitting

the identification delay and throughput are compared respectively.The results indicate that the improved anti-collision algorithm can raise the computation efficiency of reader

effectively reduce the time of channel occupied by invalid slots

and as a result

the throughput of RFID system can reach more than 52%.