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无源标签反向散射调制性能的分析和测试
Analysis and measurement for passive tag modulation performance of backscatter link
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摘要: 分析了无源超高频射频识别系统阅读器接收机获得最大有效吸收功率的标签侧条件,讨论阻抗失配对标签反向散射链路调制系数的影响,导出阅读器接收机归一化有效吸收功率、解调输出信号的信噪比下边界和接收端误码率三者的反向散射调制系数表达式.在开阔的室内环境下,完成了不同参数条件下的反向散射调制系数测试.测试研究表明,反向散射调制系数位于区间[5%,10%]时,标签可以被正确识别.Abstract: Optimal conditions for maximizing the effectively received power of reader receiver in passive ultra high frequency radio-frequency identification system are analyzed in this paper.The mismatched impendence affecting modulation index of tag backscatter link is discussed.Expressions of backscattered modulation indexes for calculating normalized effective received power of reader receiver,lower boundary of signal-to-noise ratio for demodulated output signal,and bit error rate are derived.Modulation indexes of backscatter link under different parameters are measured in open indoor environment.The measurement results show that the tag can be detected successfully when the modulation index of backscatter link is in a range from 5% to 10%.
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