关键词: 射频识别系统, 防碰撞, 无效时隙, 时隙长度, 识别效率

Abstract: In order to improve the identification efficiency of the Radio Frequency Identification（RFID）system, reduce the time of empty slot and collision slot, a new anti-collide algorithm is proposed. This algorithm detection of empty slots and collision slot is handled separately, it reduces the length of empty slot and collision slot. It dynamically adjusts the frame length according to the principle of time slot no equal long, maximally reduces the cost of invalid time slot to get the optimal identification efficiency. Algorithm analysis and simulation result show that the improved algorithm reduces the length of empty slot and collision slot, the succeed slot is increased and collision slot is reduced within a frame, and can reduce the times of frame length adjustment.

Key words: Radio Frequency Identification（RFID） system, anti-collision, invalid slot, length of slot, identification efficiency