超高频RFID读写器数字接收机设计

Design of Digital Receiver for UHF RFID Reader

针对超高频无源标签返回信号能量差异显著、数据率偏差大的特点,提出一种超高频无线射频识别(RFID)读写器数字接收机的实现方案。采用包含功率估计、数字锁相环同步和差分解码等模块的接收机方案,实现快速准确的接收。该数字接收机经过Matlab仿真验证,在Xilinx Spartan3E平台上实现并测试通过。与常用的多组相关器接收机方案相比,该数字接收机能以更少的硬件资源消耗实现更高性能的接收效果。

This paper presents a scheme of digital receiver for Ultra-high Frequency（UHF） Radio Frequency Identification（RFID） reader. Backscattered signals of passive RFID tags have various energy levels and large frequency variation, which can be handled by power detector, digital phase lock loop and differential decoding. The receiver is simulated in Matlab and implemented on Xilinx Spartan3E platform. Compared with conventional RFID receiver utilizing multiple correlation banks, the scheme achieves better performance with less hardware cost.