Adding AWGN white Gaussian noise to the signal that passes through it using the comm.AWGNChannel System object, the AWGN Channel block, or the awgn function.
Feature selection method using similarity measure and fuzzy entroropy measures based on the article: P. Luukka, (2011) Feature Selection Using Fuzzy Entropy Measures with Similarity Classifier, Expert Systems with Applications, 38, pp. 4600-4607