An accelerated constant modulus algorithm for space-time blind equalization

We address the problem of signal separation using space-time blind equalization techniques. A novel blind algorithm, denoted ACMA (Accelerated Constant Modulus Algorithm), is proposed. It mini-mizes the constant modulus cost function and is based on a tuner used in adaptive control that sets the second derivative (acceler-ation) of the coefcient estimates. Both the convergence speed and computational complexity of Multiuser ACMA lie between those of the Multiuser Constant Modulus and the Multiuser Shalvi-Weinstein algorithms. Some preliminary results show that the pro-posed algorithm presents a robust behavior with respect to global minima and tracking capability. 1