一种基于碰撞因子的RFID标签估算方法

摘要

In RFID systems, the estimating tags quantity is the key of dynamic framed slotted ALOHA algorithm. Unlike the table lookup and curve-fitting method, this paper directly gave a mathematical expression through theoretical calculation, which described the relation between the collision factor and the quantities of idle, success, collision slots. It proposed a tag quantity estimation using a collision factor based on the expression. This method is simple and don' t have the hardware cost or fitting error. Simulation indicates that the proposed method improves the accuracy of tags estimation and the speed of tag identification.%在射频识别系统中,标签数目的精确估算对于动态帧时隙ALOHA反碰撞算法起着关键的作用.基于与已往只能使用查表法和曲线拟合法不同,通过理论推导直接给出了碰撞因子与空闲、成功和碰撞时隙概率之间的数学表达式,给出了一种基于碰撞因子的标签估算方法.该方法计算简单,避免了硬件成本和拟合误差方面的缺点.MATLAB仿真证明,该方法对标签估算准确度以及标签识别速度有较大提高.