Multiuser equalization using multidimensional lattice filter for DS/CDMA

This paper proposes and investigates the adaptive multiuser equalizer based on the multidimensional IIR adaptive lattice filter in order to suppress the co-channel interference (CCI) in asynchronous DS/CDMA system. The equalizing error of the filter is small, compared with that of the multidimensional FIR transversal filter, of which the number of taps is finite. The multi-dimensional lattice filter can adaptively achieve fast and stable convergence with less taps. Since the filter can resolve correlative multiple input into orthogonal output stage by stage, CCI can be removed. Computer simulations show performance of the proposed scheme.