An ITD based automatic digital modulation recognition algorithm for broadband mobile multimedia communication system

Automatic modulation recognition is extremely important for the receiver design in the broadband multimedia communication system. Based on the intrinsic time-scale decomposition algorithm for feature extraction on which the instantaneous amplitude, phase and frequency is precisely defined, this paper proposed a feature selection algorithm to find the features with high distinguishing capacity and a digital modulation recognition algorithm. Simulation results show that this algorithm is of low complexity and the average recognition accuracy is higher than 94% using only three feature parameters when SNR is above 5dB.