Interference cancellation for DS-CDMA systems over flat fading channels through pre-decorrelating

A new scheme, called pre-decorrelating strategy, is proposed for single user detection in the forward direction of centralized DS-CDMA systems. The basic idea is that, instead of the data themselves, the linear combinations of active users´ data are transmitted, which can then decorrelate the cross-correlation between users at the receiver. In the flat Rayleigh fading environment, analysis and simulations show that the receiver is much simplified and can well cancel the multiple access interference regardless of the interference powers and without any knowledge of other users´ signature waveforms