Um Algoritmo do Módulo Constante Acelerado para Equalização Espaço-temporal

Abstract

(cid:151)The ef(cid:2)cient separation of signals is a frequent problem in multi-user communications systems. Space-time blind equalization techniques have been studied as a possible solu- tion. The Accelerated Constant Modulus algorithm was recently proposed as a blind equalization technique for combating inter- symbol interference in single-user systems. It is based on a tuner used in adaptive control that adjusts the second derivative of the coef(cid:2)cient estimates and minimizes the cost function introduced by Godard. In this paper, we extend this algorithm for blind separation and equalization of multiple users in the presence of inter-symbol interference. Through simulations, we show that the proposed algorithm outperforms the well-known MU-CM (Multi-user Constant Modulus) algorithm at the cost of introducing a moderate increase in computational complexity.