基于位编码单元的双时隙防碰撞算法

摘要

In RFID system,tags collisions occur while a reader attempts to identify multiple tags at the same time. Propose a bi-slot RFID anti-collision algorithm based on bits coding unit by setting a Bits Coding Unit ( BCU) in every tags. In this algorithm,the bit encoding unit is used to recode the collision bit information,so that the reader which does not need to traverse queries can identify the collision bit information of tags once,thereby reducing the number of queries and the identification delay,making the tags can be identified quickly. Analysis of performance and the results of simulation show that the proposed algorithm improves the identification efficiency under the condition of a lot of tags.%在RFID系统中，一个阅读器在同时有多个标签响应时就会发生标签碰撞。文中通过在标签内设置一个编码单元，提出一种基于标签位编码单元( BCU)的双时隙RFID防碰撞算法。该算法中，采用位编码单元对碰撞位信息进行重新编码，使阅读器不需要遍历查询就能一次性识别标签的碰撞位信息，从而降低了查询的次数，减少了二进制树算法延时，使得标签能够快速识别。算法性能分析和仿真结果显示，文中所提出的算法在存在大量标签的环境下识别效率有较大的提高。