On blind beamforming for multiple non-Gaussian signals and the constant-modulus algorithm

In a recent paper, Sheinvald compared a cumulant matching criterion to three simplified criteria that he claimed to be equivalent. We show that two simplified criteria can be viewed as direct consequences of a result already published and that their equivalence must be revised. We also give additional references of closely related works that have been omitted, some of them presenting Jacobi-like source separation algorithms, presented as original in by Sheinvald.