改进的基于多比特识别的射频识别标签防碰撞算法

针对现有射频识别(RFID)防碰撞算法存在的通信开支较大问题,提出一种改进的多比特识别算法.该算法在不降低原有算法识别效率的情况下,采用帧时隙的结构,避免了查询前缀的重复发送;同时,通过对碰撞比特进行定位,仅恢复碰撞比特的方法从而进一步减少了算法的通信开支.仿真结果表明,相比基于多比特识别的防碰撞算法,该算法在标签端和总通信开支方面均有所降低,其中总的通信开支最大降低20%.

Enhanced tag anti-collision algorithm based on multi-bit identification for radio frequency identification

Most Radio Frequency Identification (RFID) tag anti-collision protocols have the problem that too many bits are transmitted by tag during the identification. To solve this issue, an Enhanced Multi-Bit Identification (EnMBI) algorithm was proposed. On the premise of guaranteeing the identification efficiency, a frame-slotted structure was adopted to avoid the repeated transmitting of common prefixes. Meanwhile, through locating the collision bits, only the collision bits were recovered so as to further decrease the communication overhead. The simulation results show that the EnMBI algorithm has less tag overhead and total overhead than the multi-bit identification anti-collision algorithm. Its total overhead is at most 20% lower than the multi-bit identification algorithm.