On combinations of CMA equalizers

Renato Candido, Magno T. M. Silva, Vítor H. Nascimento. On combinations of CMA equalizers. In: IEEE International Conference on Acoustics, Speech and Signal Processing, 2009, Taipei. Proceedings of ICASSP’2009, 2009. v.I, pp.2865–2868.


We extend the affine combination of one fast and one slow least mean-square (LMS) filter to blind equalization, considering the combination of two constant modulus algorithms (CMA). We analyze the proposed combination in stationary and nonstationary environments verifying that there are situations where the absence of the restriction on the mixing parameter can be advantageous for the combination. Furthermore, we propose a combination of two CMAs with different initializations. Preliminary simulations show that this scheme can avoid local minima and eventually can present a faster convergence rate than that of its components.


Adaptive filters, Adaptive equalizers, Blind equalization, Unsupervised learning, Constant modulus algorithm.