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New Derivation for Gaussian Mixture Model Parameter Estimation: MM Based Approach

In this letter, we revisit the problem of maximum likelihood estimation (MLE) of parameters of Gaussian Mixture Model (GMM) and show a new derivation for its parameters. The new derivation, unlike the classical approach employing the technique of expectation-maximization (EM), is straightforward and doesn't invoke any hidden or latent variables and calculation of the conditional density function. The new derivation is based on the approach of minorization-maximization and involves finding a tighter lower bound of the log-likelihood criterion. The update steps of the parameters, obtained via the new derivation, are same as the update steps obtained via the classical EM algorithm.