Abstract
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.
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