Optimal and adaptive FIR filter receivers for DS-CDMA
David G. M. Cruickshank · 2002
We calculate the optimum (Weiner) FIR filter for a DS-CDMA system in Gaussian noise using Gold codes. We consider adaptive filter approximations to the Weiner filter, showing that an RLS algorithm can provide a good approximation to the Weiner filter with fast convergence in the stationary case. The outline of a method for extending this work to the non-stationary cellular channel is also given. We concentrate our results on the filter's ability to suppress multiaccess interference (MAI). The choice of an FIR filter enables us to calculate optimal filter in the presence of MAI and additive noise using Wiener filter theory and to describe a method for extending the optimisation process to include the multipath cellular channel.