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The multiuser constant modulus algorithm (MU-CMA) can be employed for blind equalization of multiple-input multiple-output (MIMO) communication systems. Due to the multi-modality of the constant modulus cost function, some adverse situations can cause inconsistency in the nonlinear estimates, which in turn can lead the algorithm to diverge. In order to avoid divergence, we propose a dual-mode multiuser...
We propose blind equalization algorithms that perform similarly to supervised ones, independently of the QAM order. They converge approximately to the Wiener solution, which generally provides a relatively low misadjustment. Besides presenting strategies to speed up their convergences, we provide sufficient conditions for the stability of the symbol-based decision algorithm, which is an extension...
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