应用于超高频阅读器的相关解调器设计  

Correlation Demodulator Design for UHF RFID Reader

作　　者：刘圆[1] 黄晨灵[1] 李国宏 韩益锋 闵昊[1] 

机构地区：[1]复旦大学专用集成电路与系统国家重点实验室,上海201203 [2]智骋电子(上海)有限公司,上海201203

出　　处：《小型微型计算机系统》2007年第12期2282-2287,共6页Journal of Chinese Computer Systems

基　　金：国家高技术研究发展"八六三"计划资助项目(2005AA1Z1300)资助

摘　　要：在分析RFID系统接收数据的特征的基础上,提出一种基于相关操作的数字解调器设计.该解调器可对低信噪比且具有较大频偏的接收数据完成频偏估计并进行解码.仿真结果显示,该解调器可对信噪比≥6dB、频偏+/-22%之内的数据进行正确解调,FPGA测试结果表明,应用该解调电路后阅读器和标签的通讯距离可达4米以上.本文采用的设计思想亦可拓展到除RFID系统外其他低接收信噪比、大频偏信号的接收机设计中.In this paper, a high performance digital demodulator used for UHF RFID Reader receiver is proposed. After carefully analyzing the characteristics of the received data, correlation operation is introduced into the demodulator design to estimate the frequency of the received data and then decode them. This demodulator has been implemented on FPGA and found to work well for the RFID receiver link. Simulation results and FPGA test results indicate that this demodulator can work well under the 6dB input signal-to-noise ratio （SNR） and tolerate ＋/- 22% frequency deviation of the received data.

关 键 词：解调器 相关 射频识别 

分 类 号：TP331[自动化与计算机技术—计算机系统结构]