摘要
针对现有RFID多标签防碰撞算法无法兼顾减小传输开销与降低碰撞率的缺点,提出了一种基于多碰撞位联合锁位动态可调防碰撞算法的系统。系统工作流程包括空闲时隙检测和多标签动态识别,空闲时隙检测用于锁定空闲时隙,以避免阅读器访问增大时间开销;多标签识别采用动态可调整防碰撞算法,其由多碰撞位联合锁位防碰撞算法和动态二叉树算法构成,阅读器根据曼彻斯特译码结果检测碰撞,估算标签数量,从而调用不同的防碰撞算法,成功识别一个标签后返回到上一次发生碰撞的节点。仿真结果表明,通信速率125 Kbit/s条件下,系统在传输开销、寻呼指令开销、吞吐率性能方面有明显的提高。
Due to the existing RFID multi-tag anti-collision algorithm can＇t solve the faults of reducing the transmission overhead or having a low collision rate,a system of dynamic adjustable algorithm based on multi-collision bit joint lock-bit is proposed.System working process includes free timeslot detection and multi-tags dynamic identification,free timeslot detection is used for locking free timeslot in order to avoid increases time cost of reader access.Multi-tag identification uses dynamic adjustable anti-collision algorithm,it is composed of multi-collision bit joint lock-bit anti-collision algorithm and dynamic binary tree algorithm.According to the collision results of Manchester decoder test,the reader estimates the number of tags.After successful identifying a collision tag,the system called different collision algorithm returns to the last occurrence of the collision nodes.When the communication rate is 125 Kbit/s,the simulation results show that the system is significantly improved in transmission cost,paging instruction spending and throughput.
出处
《电子测量与仪器学报》
CSCD
2013年第8期773-780,共8页
Journal of Electronic Measurement and Instrumentation
基金
教育部博士点基金(20100111110004)
国家物联网发展专项资金计划(工信部科〔2012〕583)
科技部科技型中小企业技术创新基金(11C26214425532)
安徽高校省级自然科学研究(KJ2011ZD01)资助项目
关键词
RFID
动态可调整
多碰撞位联合锁位
空闲时隙
Radio frequency identification system
tags anti-collision
dynamic adjustable
free time slot
