Space-time pre-RAKE multiuser transmitter precoding for DS-CDMA systems

A novel linear precoding method that combines multiuser interference (MAI) cancellation, pre-RAKE filtering and transmitter (Tx) antenna diversity is proposed for the downlink of the code division multiple access (CDMA) channel. It is demonstrated that this method has better performance than single user space-time pre-RAKE precoding with relatively low increase in complexity. In addition, several novel and previously proposed MAI cancellation methods for the uplink and downlink are compared. Long range prediction is employed to enable performance of Tx precoding for rapidly time varying fading CDMA channels.

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