Advanced Collision Recovery Receiver for RFID

In this paper, we focus on a substantial throughput increase of a Radio Frequency Identification (RFID) multiantenna system. We investigate the influence of the channel estimation and the receiver structure on the theoretical throughput of Framed Slotted Aloha (FSA) based RFID systems. We propose an increase of the theoretical throughput by resolving collisions and acknowledging more than one tag per slot. Furthermore, in order to profit of such increase, we suggest a collision recovery method through successive interference cancellation and projection of the constellation into the orthogonal subspace of the interference. The performance of the proposed method is analysed by means of simulations.