An M-QAM Signal Modulation Recognition Algorithm in AWGN Channel

Figure 20

(a) Probability of the correct classification rate vs frequency offset and signal length N = 4096. (b) Probability of the correct classification rate vs frequency offset with variable signal lengths from N = {64 128 265 512 1024 2048 4096} with a phase offset of “.” {4∼1024}-QAM with 10,000 signal under AWGN—only SNR = −2 dB.

(a)

(b)