A Novel Automatic Modulation Recognition Method for RFID Signals Based on ANN and SDR

In this paper, to improve the recognition rates, based on the technology of software defined radio and artificial neural network, a novel method for modulation recognition of RFID signals is proposed. New characteristic parameters R is presented, which can be used to distinguish the different modulation modes, such as, ASK, FSK and PSK, or 2ASK and 4ASK. Simulation results indicate that, the proposed method can recognize the different modulation modes exactly and quickly, and the recognition rates are greater than or equal to 94% even the signal to noise ratio is more than 5dB.