超高频射频识别系统信号特征分析及应用

Signal characterization and application of UHF RFID system

基于无源标签的超高频射频识别系统由于其上下行通信的不对称性,读写器和标签在基带分别采用PIE和FM0/Miller编码。通过分析和计算得到了其各自的功率谱特征,并依此确定了第一零点带宽与数据率的关系。同时,在读写器发射信号分别采用DSB-ASK、SSB-ASK及PR-ASK调制时,通过数值仿真得到了PIE编码数据在经过基带脉冲成形滤波器调制后的功率谱及相应的邻道功率抑制,并给出了在一定信道带宽条件下,优化的通信数据率选择方案。

For the asymmetry property of the passive tag UHF RFID system＇s up/down link, PIE and FM0/Miller encoding were used in the reader and tag baseband respectively. The power spectral density （PSD） and the first null bandwidth of these encoding were characterized by analysis and calculation. The PSD and adjacent channel power ratio （ACPR） of DSB-ASK, SSB-ASK and PR-ASK modulated PIE data after pulse shaping were given by simulation. And the optimized data rate was proposed for a given channel bandwidth.