Optimized recovery of collided chipless RFID signals using Fractional Fourier Transform

Chipless RFID systems appears as an alternative to reduce the costs of RFID systems by using tags without a chip. The design of these new systems impose some challenges as the design of a tag, processing the signal reflected by the tag, among others. In this paper we consider the problem of collisions in the signal reflected simultaneously by various tags, and the recovery of information in these collided signals. The problem is treated by processing the signals received by the reader using the Fractional Fourier Transform - FrFT and the binary information is recovered using the minimum distance detection concepts. Presented simulation results show the effectiveness of the proposed method.