Conference Paper

# Digital modulation recognition using support vector machine classifier

Dept. of Electr. & Comput. Eng., George Washington Univ., DC, USA

DOI: 10.1109/ACSSC.2004.1399565 In proceeding of: Signals, Systems and Computers, 2004. Conference Record of the Thirty-Eighth Asilomar Conference on, Volume: 2 Source: IEEE Xplore

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**ABSTRACT:**This work presents a novel method for automatic modulation classification based on discriminative learning. The features are the ordered magnitude and phase of the received symbols at the output of the matched filter. The results using the proposed front end and support vector machines are compared to other techniques. Frequency offset is also considered and the results show that in this condition the new method significantly outperforms two cumulant-based classifiers.IEEE Communications Letters 01/2011; 15:443-445. · 1.16 Impact Factor - [Show abstract] [Hide abstract]

**ABSTRACT:**Automatic digital modulation recognition in intelligent communication systems is one of the most important issues in software radio and cognitive radio. In this paper a new method will be presented for automatic digital modulation classification in presence of additive white Gaussian noise (AWGN). In this method a set of three different types of features is extracted to be employed in recognition process. Classification is based on support vector machine (SVM) as a powerful method for pattern recognition, and particle swarm optimization (PSO) to configure kernel parameters. Computer simulations of 16 different types of digitally modulated signals corrupted by AWGN are carried out to measure the performance of the method. Employing multiple SVMs in a hi-erarchical structure as inter-class and intra-class classifiers and also our proposed method for feature selection based on features impact on severance, presents good results in simulations. The results show that with infinite SNR, accuracy tends to 99.9%. Also this method shows eligible robustness in presence of noise as we can see in experiments conducted using low SNR data.6'th International Symposium on Telecommunications (IST'2012), Tehran; 01/2012 -
##### Conference Paper: Performance of the instantaneous frequency based classifier distinguishing BFSK from QAM and PSK modulations for asynchronous sampling and slow and fast fading

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**ABSTRACT:**In this paper we propose a feature to distinguish frequency from amplitude-phase digital modulations. We compare the performance of the feature where every symbol is sampled more than once to that where every symbol is sampled only once. The feature is based on the product of two consecutive signal values and on time averaging of the imaginary part of the product if a symbol is sampled more than once. First, the conditional probability density functions of the feature given the present modulation are determined. The central limit theorem for strictly stationary m-dependent sequences is used to obtain Gaussian approximations. Then thresholds are determined based on the minimization of the total probability of misclassification. Following that, effects of fast and slow fading, and of the symbol period and delay being non-integer multiples of sampling period on the performance are studied. In the course of doing that, the proposed classifier is compared to the maximum likelihood classifier and the wavelet based classifier using support vector machine.Information Sciences and Systems (CISS), 2013 47th Annual Conference on; 01/2013

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