Abstract: Because the accurate rate could not be evaluated objectively and overall in recognition of digital modulation,it was proposed that area under receiver operating characteristic(AUC) was used for assessing the LS-SVM classifier and NN classifier's performance. After using the five characteristics parameters, the classification of digital modulation was successfully realized by adopting the LS-SVM classifier and NN classifier. The values of AUC were used for evaluating the merits and demerits of classifiers. The relevant simulation results shown the average performance of the LS-SVM classifier is better than that of the NN classifier.

Key words: Performance evaluation, AUC, ROC curve, SVM, Modulation recognition