Automatic Modulation Recognition of Communication Signals
Automatic Modulation Recognition of Communication Signals
Digital Modulation Identification by Wavelet Analysis
ICCIMA '05 Proceedings of the Sixth International Conference on Computational Intelligence and Multimedia Applications
A wavelet-based method for classification of binary digitally modulated signals
SARNOFF'09 Proceedings of the 32nd international conference on Sarnoff symposium
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In this study, automatic recognition of digitally modulated signals is investigated using the Continuous Wavelet Transform (CWT) in conjunction with techniques typically used in pattern recognition. In particular, the method of template matching is used. The templates used for the Automatic Modulation Recognition (AMR) process are determined based on the features, i.e., fractal patterns in the scalograms, of specific modulation schemes as they appear in the Wavelet Domain (WD). The digital modulation schemes considered include both binary and quaternary Amplitude (ASK) and Frequency Shift Keying (FSK), as well as M-ary Phase Shift Keying (MPSK) signals, where M=2, 4, and 8. The modulated signals used in this study have been corrupted by Additive White Gaussian Noise (AWGN) resulting in Signal-to-Noise Ratios (SNRs) in the range of -5 dB to 10 dB. Through the use of Monte Carlo computer simulations, it has been determined that the average overall correct classification rate for M-ary PSK signals was 99.1%; 98.9% for BASK and 4-ASK signals; and 90.4% for BFSK and 4- FSK signals over the range of SNR values.