基于多处碰撞位探测的标签防碰撞算法研究

在无线射频识别系统（RFID）中，当阅读器向范围内的标签发送命令以后，标签向阅读器发送反馈信号，当有两个或者两个以上的标签做出了相同的反馈信息，就会产生标签碰撞。解决碰撞问题提高标签识别效率对RFID的应用具有重要意义。针对目前一些已有算法存在查询次数过多且吞吐率不高的问题，该文提出一种基于多处碰撞位探测的标签防碰撞算法(Multiple Collision Bits Detection, MCBD)。该算法通过阅读器发送的探测命令，获取标签发生碰撞位的比特值，再结合查询命令直接识别出标签。仿真实验结果显示MCBD算法降低了识别标签所需的查询次数，提高了吞吐率。该文算法的创新在于可以对单独或者连续的碰撞位都一并处理，充分利用标签的ID信息，对RFID标签识别的研究具有一定意义。

Research of Tag Anti-collision Algorithm based on Multiple Collision Bits Detection

The tag sends a feedback signal to the reader when the reader sends a command to the tags within the range in the RFID system. When there are two or more than two tags make the same feedback information, it will produce the tag collision. It has great significance for the application of RFID to solve collision problems and improve the efficiency of tag identification. In this paper, a Multiple Collision Bits Detection (MCBD) algorithm is proposed, according to the fact that some existing algorithms have too many query times and low throughput rate. Through the detection command sent by the reader, this algorithm can obtain the bit value of the collision bit, and then the tag is identified directly by query command. The simulation results show that the MCBD algorithm reduces the number of query times and improves the throughput rate. The innovation of this algorithm is that it can deal with single or continuous collision bits, and make full use of the ID information of the tags, which is meaningful to the recognition of RFID tags.