基于EPC C1G2协议的RFID系统数据解码

Data Decoding of RFID System based on EPC C1G2 Protocol

RFID系统中数据解码模块的性能对整个系统影响极大。对基于EPC C1G2协议的UHF RFID系统数据解码进行研究,讨论了目前该系统前向链路的PIE码解码的主要理论基础。该系统的反向链路采用FM0码或采用Miller码调制副载波,提出了一种新的解码实现方法,即利用时钟信号将收到的每个数据的前半个周期分解为一路信号,后半个周期分解为另一路信号然后再运用基本数字逻辑器件进行解码。在Simulink平台下运用该方法分别搭建仿真模型实现了FM0码的解码和含有多个副载波周期的Miller码的解码。

Data decoding modules have a huge effect on the performance of the whole RFID system.This paper studies data decoding of UHF RFID system based on EPC C1G2 protocol.The main theoretical foundation of PIE decoding in the forward link of the system is discussed.The reverse link of the system encodes data as FM0 baseband or Miller modulation of a subcarrier.Here a new method is proposed,i.e.,first and second half periods of each bit of the received data is changed into two respective signals with clock signals,then the data is decoded with basic digital logic devices.The simulation models are respectively constructed with Simulink platform,thus to implement decoding of FM0 and Miller with several periods of subcarrier.