改进的基于ALOHA的RFID防碰撞算法

Improved RFID anti-collision algorithm based on ALOHA

为了解决RFID系统中电子标签识别效率不高的问题,对基于ALOHA的随机性防碰撞算法进行了详细分析,提出了一种新的ALOHA防碰撞算法。在该算法中,针对标签估计,采用动态调整的方式自动改变标签估计式中的系数,使得标签估计个数随着已识别的标签数动态变化,从而估计下一帧待识别标签数;而对于帧长调整,根据估计的标签数,通过帧长与标签数分组的关系确定。通过MATLAB进行仿真,结果表明,该算法能明显提高系统的吞吐率和稳定性。

In order to solve the problem of low efficiency of electronic tag identification in RFID system, a new ALOHA anti-collision algorithm was presented. In this algorithm, the coefficients of the tag estimation were automatically changed by using the dynamic adjustment method, which made the number of tag estimation could be dynamic changed with the number of identified tags, then the number of tags to be identified was estimated. And for the frame length adjustment, it could be determined by the relationship between the length of the frame and the tag number according to the estimated number of tags. With the tool of MATLAB, the results show that the proposed algorithm can significantly improve the throughput and stability of the system.