Blind successive interference cancellation for DS-CDMA systems

In this work we propose a blind successive interference cancellation receiver for asynchronous direct-sequence code-division multiple-access (DS-CDMA) systems using a maximum mean energy (MME) optimization criterion. The covariance matrix of the received vector is used in conjunction with the MME criterion to realize a blind successive interference canceler that is referred to as the BIC-MME receiver. Simulation results show that this scheme offers performance gains over the well known blind receiver that is based on the minimum mean squared error (MMSE) optimization criterion. Further, the BIC-MME receiver is particularly effective in the presence of a few strong interferers as may be the case in the downlink of DS-CDMA systems where intracell user transmissions are orthogonal. The receiver is also shown to perform well in the presence of estimation errors of the covariance matrix making it suitable for use in time-varying channels. An iterative implementation that results in reduced complexity is also studied WINLAB Proprietary i