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东北师范大学 物理学院,吉林 长春,130024
收稿日期:2014-07-25,
修回日期:2014-08-04,
纸质出版日期:2014
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梁士利, 徐美玲, 林青等. 优化结合二叉树和帧时隙ALOHA的防碰撞算法[J]. 光学精密工程, 2014,22(9): 2580-2584
LIANG Shi-li, XU Mei-ling, LIN Qing etc. Mixed frame anti-collision algorithm based on binary tree and frame time slot ALOHA[J]. Editorial Office of Optics and Precision Engineering, 2014,22(9): 2580-2584
梁士利, 徐美玲, 林青等. 优化结合二叉树和帧时隙ALOHA的防碰撞算法[J]. 光学精密工程, 2014,22(9): 2580-2584 DOI: 10.3788/OPE.20142209.2580.
LIANG Shi-li, XU Mei-ling, LIN Qing etc. Mixed frame anti-collision algorithm based on binary tree and frame time slot ALOHA[J]. Editorial Office of Optics and Precision Engineering, 2014,22(9): 2580-2584 DOI: 10.3788/OPE.20142209.2580.
分析和比较了现有无线射频识别(RFID)中采用的防碰撞算法存在的问题,提出了一种优化结合二叉树(BT)和帧时隙ALOHA的新的防碰撞算法。提出的算法在阅读器与标签开始通讯时采用帧时隙的ALOHA算法,当有时隙发生碰撞时采用BT算法对其进一步识别。该算法根据曼彻斯特译码得到碰撞位,通过估算一帧中可能出现的碰撞情况,运用数学推导并通过R软件编程计算给出数学期望值。仿真实验显示:提出的算法充分发挥了两种算法的优点,其搜索次数、传输时延、吞吐率等重要指标都明显优于ALOHA算法,尤其是新的防碰撞算法的吞吐率比ALOHA算法提高了近50%。另外,传输负担的减小还使数据传输的安全性有了更高的保障。
The current anti-collision algorithms for Radio Frequency IDentification (RFID)was analyzed and compared
and an optimized mixed frame anti-collision algorithm based on the binary tree and frame time slotted ALOHA was presented to resolve the problems in traditional algorithms. In proposed algorithm
the frame time slot algorithm was used to identify collision time slot when a reader communicated with the labels. However
if the collision labels have happened in the one time slot
the binary tree algorithm was used to make a clear distinction. By using the Manchester decoder to get collision location
the states of collision was estimated in one time slot
then the mathematical expectation was obtained by using mathematical deduction and R software programming. The simulation shows that the proposed mixed algorithm gives full play to the advantages of the two algorithms
its throughput rate
searching time and transmission delay are all superior to that of the traditional algorithm
especially
the throughput rate is nearly higher 50% than that of the ALOHA algorithm. Moreover
the data transmission shows higher security by decreasing of the burden of other transport.
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