Blind adaptive CDMA receivers based on independent component separation with user-and-delay identification

In this paper, new blind adaptive CDMA receivers based on independent component separation with user-and-delay identification are presented for practical multipath channel environments. The proposed cost functions are globally convergent and the obtained weight matrices at the global minima are in the vicinity of the inverse of the contribution matrix, to within a phase and/or permutation ambiguity. The proposed user-and-delay. identification, which is performed periodically on the obtained weight matrix, can distinguish with high probability the filter that corresponds to the desirably delayed data symbol bit of the user of interest. Analyses and simulations demonstrate that the presented blind adaptive receivers have higher user-and-delay identifiable capacity, and can achieve fast convergence speed and high steady state performance at low computational complexity.