Automatic Digital Modulation Recognition System Using Feature Extraction

Automatic modulation recognition is the vital part in the advanced communication system used for both military and civil applications. In this paper a new methodology is proposed for distinguishing five digital modulation schemes (ASK-2, ASK-4, FSK, BPSK and QPSK). The algorithm extracts the features from the received signal and they are tested against preset thresholds to determine the modulation type of received signal. The simulations are done using MATLAB 2013 and results show that the system has an average recognition rate of 99.6 % at SNR as low as 4 dB.

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