Adaptive Minimum BER Decision Feedback Multiuser Receivers for DS-CDMA

"In this paper we investigate the use of adaptive minimum bit error rate (MBER) decision feedback (DFE) multiuser receivers (MUD) for DS-CDMA systems. We examine stochastic gradient adaptive algorithms for approximating the bit error rate (BER) from training data. Computer simulation experiments show that the DFE-MUD structure employing adaptive MBER algorithms outperforms linear MUDs with these algorithms and the DFEMUD with the minimum mean square error (MMSE) criterion."