In this letter, we propose a new and efficient physical layer collision recovery method which exploits the statistical properties of RFID tag signals in terms of the second and fourth-order cumulants. This method is able to recover more than two collided tags even with a single receive antenna at the reader and without requiring any modification in the EPC C1 G2 standard used for UHF RFID passive tags. Simulation results show that the proposed method exhibits the lowest complexity compared to existing techniques. Moreover, the throughput analysis reveals that, when the proposed approach is used in the framed slotted ALOHA protocol, it provides a significant gain of 1.58 read tags per slot at an average SNR of 20dB.

中文翻译：

---

新的半盲标签分离方法，用于 RFID 系统中高效标签读取器碰撞恢复

在这封信中，我们提出了一种新的有效的物理层碰撞恢复方法，该方法利用 RFID 标签信号在二阶和四阶累积量方面的统计特性。即使在阅读器处使用单个接收天线，该方法也能够恢复两个以上碰撞的标签，并且无需对用于 UHF RFID 无源标签的 EPC C1 G2 标准进行任何修改。仿真结果表明，与现有技术相比，所提出的方法具有最低的复杂度。此外，吞吐量分析表明，当在成帧时隙 ALOHA 协议中使用所提出的方法时，它提供了每时隙 1.58 个读取标签的显着增益，平均 SNR 为 20dB。