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电子学报  2014 

RFID防碰撞时隙应变协处理算法研究

DOI: 10.3969/j.issn.0372-2112.2014.06.016, PP. 1139-1146

Keywords: 射频识别,防碰撞算法,差分门限,时隙前向检测,时隙后向预测

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Abstract:

射频识别(RadioFrequencyIDentification,RFID)技术具有同时识别多个标签的能力.由于标签随机占用信道会使响应信号发生混叠,当大量的标签在读写器感应区域内同时响应势必会引起标签碰撞问题,严重影响了RFID的系统吞吐率.为进一步提高RFID系统吞吐率,在不增加标签端算法复杂度和硬件的条件下,本文提出了预设调整盘存周期的差分门限、时隙前向检测后向预测和二进制散列的方法,协同处理当前时隙和下一个时隙的标签响应情况.利用预设差分门限的方式避免读写器进行浮点运算,同时通过时隙前向检测和后向预测的方法提前判别当前时隙和下一个时隙的标签响应情况,然后快速跳过当前空闲时隙和下一个空闲时隙,并对在当前碰撞时隙和下一个碰撞时隙响应的标签实时进行二进制散列.通过盘存周期调整方式比较、时隙散列方式对比、识别时延与吞吐率比较三个仿真实验,结果显示改进的算法提高了读写器的计算效率,明显减少了无效时隙占用信道的时间,RFID系统吞吐率可提高到52%以上.

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