Comments on "A linearly constrained constant modulus approach to blind adaptive multiuser interference suppression"

A linearly constrained constant modulus (LCCM) receiver mas presented in th e above paper by Muguez et al. In this letter, we point out that the analys is in-the above paper is incomplete and show in the noise-free case that th e LCCM approach can completely remove multiple-access interference if and o nly if the desired user amplitude is no less than the critical value 1/root 3. The simulation examples demonstrate the results.