Improved successive cancellation of DS-CDMA signals using signal orthogonalization

In DS-CDMA communication systems, multiple access interference can be mitigated with multi-user receiver techniques. One such technique, successive cancellation, is limited in performance because cancelled signals are not entirely removed. An improvement to successive cancellation is proposed which employs orthogonalized signature sequences. This allows all cancelled signal energy to be removed. Alternatively, orthogonalized signature sequences can be used in the detection process, eliminating the need for the cancellation process. Simulation results demonstrate the improved performance of the proposed approach. Extensions of the approach for asynchronous signals, time-dispersed signals, and other forms of DS-CDMA are also discussed