一种基于二进制码调制的射频识别防碰撞算法

摘要

To improve the identification efficiency and reduce the communication overhead,a novel algorithm,Binary Code Modulation Algorithm( BCMA) is proposed. BCMA works as follows:the activated tag generates and sends back a 2m bit binary code,Master Control Relay(MCR),on which the location information of the tag’s ID in the multi-branch tree is modulated. After receiving the MCR,the reader finds out the collided bits,demodulates the branch information,and groups the tags into determinate subsets. It is obvious that BCMA avoids generating idle slots. Analysis results and simulations show that compared with other existing multi-branch algorithms, as the common octree algorithm, BCMA improves the system throughput by 168% .%针对射频识别( RFID)标签防碰撞算法识别效率低的问题,提出一种基于二进制码调制的RFID标签防碰撞算法BCMA。对传统多叉树防碰撞算法进行改进,活动标签采用位编码技术把标签ID在多叉数中的位置信息调制到一个2m位的二进制数主控继电器(MCR)上,并把MCR回送给阅读器；阅读器采用位跟踪技术,定位MCR碰撞发生的数位,从而解调出活动标签的分组信息。阅读器对待识别标签的分组是确定性的,进而避免空闲时隙的产生,提高系统识别效率。仿真结果表明,与常见的八叉树算法相比,BCMA算法使系统吞吐率提高168%。