Fig. 2From: Very-low-SNR cognitive receiver based on wavelet preprocessed signal patterns and neural networkThe 3-bit glossary space with 5 levels, each of which has 7 patterns (depth is set to 6). The signal’s amplitude is [0.1,0.2,0.45,0.7,0.9] V, frequency is [4.600,5.000,5.600,6.600,7.400] kHz, and phase shift is [ −π/2 −π/4 0 π/4 π/2] radBack to article page