一种新的RFID标签数目估算方法  

Novel tags quantity estimation method for anti-collision in RFID systems

作　　者：邓晓[1] 何怡刚[1] 向阳[1] 肖迎群[1] 

机构地区：[1]湖南大学电气与信息工程学院,长沙410082

出　　处：《计算机工程与应用》2008年第31期142-144,共3页Computer Engineering and Applications

基　　金：国家自然科学基金No.50677014;国家高技术研究发展计划(863)No.2006AA04A104;高校博士点基金No.20060532002~~

摘　　要：动态帧时隙ALOHA反碰撞算法中帧长度调整的关键在于对阅读器读写范围内标签数目的估算。通过模拟帧时隙ALOHA算法得到了不同帧长度时标签数目与碰撞时隙数目的关系曲线。创建了碰撞时隙中的平均标签数目e和碰撞时隙所占比例PC之间关系的数学表达式,该表达式对所有的帧长度都适用。在此基础上提出了一种新的RFID标签数目估算方法。该方法计算量小,不需要预先建立和存储查找表,有利于提高RFID系统的实时响应速度和降低硬件成本。MATLAB仿真表明,提出的标签数目估算方法比现有的方法估算准确度有较大提高。Estimating tags quantity in the valid area of the reader is the key of dynamic frame slotted ALOHA algorithm in RFID systems.A mathematical expression is constructed which describes the relation between the average tags quantity in collision slots and the collision slots proportion in a frame through simulating frame slotted ALOHA algorithm and analyzing the related data.A novel RFID tags quantity estimating method is proposed based on the expression.The proposed method doesn＇t need complex computation and extra memory to store lookup tables.Simulation indicates that the proposed method improves the estimating precision apparently compared to other estimating methods.

关 键 词：射频识别 反碰撞 动态帧时隙ALOHA算法 标签数目估算 

分 类 号：TN911[电子电信—通信与信息系统]