【摘要】 针对超高频无源射频识别(RFID)系统中Capture效应的分析问题,提出一种新颖的Capture模型-RFIDCap,并通过Monte-Carlo仿真分析了各系统参数对Capture效应的影响,同时比较了RFIDCap及其他传统模型与测试结果的符合程度.RFIDCap综合考虑了读写器抗干扰能力、无线信道损耗及衰落、标签反向散射等因素.仿真结果表明,读写器capture阈值、碰撞标签数量及标签位置是影响capture概率的主要因素.测试结果表明,实测数据与RFIDCap仿真值的均方误差小于3%,相对传统模型(均方误差大于12%)有较大幅度的改善.更多还原

【Abstract】 Capture effect plays an important role in system performance evaluation and efficient anti-collision algorithm development in passive UHF RFID systems.In this paper,a novel RFID capture model-RFIDCap is presented,which considers the anti-interference performance of RFID reader,path loss and Rician fading of indoor radio channel,backscattering and spatial distribution of passive tags.Dependence of system parameters on capture probability is analyzed by Monte-Carlo simulation.The results show that the capture ratio,collision size and TR(Tag-Reader) distance are the main influence factors for capture probability.Experimental results measured at a warehouse show that the mean square error between simulation results from RFIDCap and measurement data is less than 3%,which is much smaller than that as in traditional RFID capture models.更多还原