A New Approach to Blind Multiuser Detection Based on Affine Projection Algorithm

The computational complexity of the blind adaptive multiuser detection algorithm with multipath fading channel is usually high. By combining Rake receiver and blind multiuser detection based on the affine projection algorithm (APA), an adaptive receiver which can be used in multipath fading channel is presented in this paper. As the APA can provide a good capability to tradeoff convergence speed and computational complexity, the proposed receiver has much improved convergence speed and tracking properties compared to the LMS-based receiver with much reduced computational cost compared to the one based on RLS algorithm, and also the new receiver is extremely near-far resistant. Simulation results are presented to compare our APA-based receiver with the blind LMS and RLS-based schemes and demonstrate the effectiveness of the proposed receiver.