基于后向散射调制指数选择的RFID系统工作范围提高  

Improved operating range of RFID system based on backscattering modulation index selection

作　　者：霍兰兰[1] 马照瑞 Huo Lanlan;Ma Zhaorui(Logistics School,Henan College of Transportation,Zhengzhou 450000,China;School of Computer and Communication Engineering,Zhengzhou University of Light Industry,Zhengzhou 450000,China)

机构地区：[1]河南交通职业技术学院物流学院,郑州450000 [2]郑州轻工业大学计算机与通信学院,郑州450000

出　　处：《国外电子测量技术》2022年第7期166-172,共7页Foreign Electronic Measurement Technology

基　　金：河南省高等学校重点科研项目基础研究项目(21zx014);共青团河南省委专项调研课题(QSNYJ2019228)项目资助。

摘　　要：针对无源射频识别系统上、下行工作范围的不对称性,提出了基于后向散射阻抗调制指数选择的方案。一方面将标签集成电路的两种阻抗状态用来实现后向散射调制,每种调制状态都由一个调制指数来表征;另一方面,通过对并联调制、串联调制和混合调制3种调制方式的分析,获得不同调制方式下的下行和上行范围估计;为了进一步提高工作范围,将问题构建为一个以最大化系统工作范围为目标同时使下行和上行范围相等的约束优化问题,通过优化求解获得最佳调制指数,从而实现系统工作范围最大化。仿真实验结果表明,所提出的方案不仅能够在给定标签灵敏度下获得理想范围内的后向散射调制指数和工作范围,而且相比于其他方案有更大的最大工作范围。Aiming at the asymmetry of the operating range of passive RFID system,a scheme based on backscattering impedance modulation index selection is proposed.On the one hand,two impedance states of tag integrated circuit are used to realize backscattering modulation,and each modulation state is characterized by a modulation index.On the other hand,through the analysis of three modulation modes,namely parallel modulation,series modulation and mixed modulation,the downlink and uplink range estimation under different modulation modes is obtained.In order to further improve the operating range,the problem is constructed as a constrained optimization problem with the goal of maximizing the system operating range and making the downlink and uplink ranges equal simultaneously.The optimal modulation index is obtained by optimizing the solution,so as to maximize the operating range of the system.The simulation results show that the proposed scheme can not only obtain the desired backscattering modulation index and operating range under the given tag sensitivity,but also has a larger maximum operating range compared with other schemes.

关 键 词：射频识别系统 无源标签 后向散射 调制指数 标签灵敏度 误码率(BER) 工作范围 

分 类 号：TN820.1[电子电信—信息与通信工程]