Fig. 1. Experimental configuration

Fig. 2. Schematic of frequency shift of Rayleigh scattering traces

Fig. 3. Structural diagrams of ANN and neuron

Fig. 4. Performance evaluation of ANN model. (a) Actual frequency and predictive frequency; (b) absolute errors of two frequencies

Fig. 5. Demodulation results by different methods. (a)(b) ANN model; (c)(d) cross-correlation method