Title :
Multiuser equalization using multidimensional lattice filter for DS/CDMA
Author :
Jitsukawa, Daisuke ; Kohno, Ryuji
Author_Institution :
Fac. of Eng., Yokohama Nat. Univ., Japan
Abstract :
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
Keywords :
IIR filters; adaptive equalisers; adaptive filters; cellular radio; cochannel interference; code division multiple access; convergence of numerical methods; correlation theory; interference suppression; land mobile radio; lattice filters; multidimensional digital filters; pseudonoise codes; radiofrequency interference; spread spectrum communication; DS/CDMA; adaptive multiuser equalizer; co-channel interference; convergence; correlative multiple input; equalizing error; multidimensional IIR adaptive lattice filter; orthogonal output; performance; taps; Adaptive filters; Equalizers; Finite impulse response filter; IIR filters; Interchannel interference; Lattices; Multiaccess communication; Multidimensional systems; Radiofrequency interference; Transversal filters;
Conference_Titel :
Universal Personal Communications. 1995. Record., 1995 Fourth IEEE International Conference on
Conference_Location :
Tokyo
Print_ISBN :
0-7803-2955-4
DOI :
10.1109/ICUPC.1995.497139
