An improved multi-user CDMA decorrelating detector

Decorrelating detectors were proposed as tools to combat the near-far problem in multi-user CDMA communication systems. They were also used as the first stage of many two-stage, multi-user signal separators to facilitate tentative decisions for the canceller stage. These decorrelators result in a complete separation of signals, but also in relatively high additive noise. An improved multi-user detector is proposed. It may not totally reject other signals, but it does result in a better error probability, particularly in regions where interference energies are low. The proposed improved decorrelators can be implemented by an adaptive algorithm and hence are better suited for a changing environment