Adaptive multiuser receivers for DS-CDMA using minimum BER gradient-Newton algorithms

In this paper we investigate the use of adaptive minimum bit error rate (MBER) Gradient-Newton algorithms in the design of linear multiuser receivers (MUD) for DS-CDMA systems. The proposed algorithms approximate the bit error rate (BER) from training data using linear multiuser detection structures. A comparative analysis of linear MUDs, employing minimum mean squared error (MMSE), previously reported MBER and the proposed MBER algorithms is carried out. Computer simulation experiments show that the MBER Gradient-Newton approaches outperform other analysed algorithms and can operate with shorter training sequences.