Power allocation for a simple successive interference cancellation scheme in a multi-rate DS-CDMA system

We investigate a multi-rate receiver utilizing soft feedback successive interference cancellation. To be able to meet the QoS requirements for each user, the multiuser detection is done in conjunction with power control. For this, we introduce a power control scheme that takes into account the respective QoS requirements and the impact of imperfect interference cancellation. We derive the minimum power solution, from which distributed iterative power control algorithms are suggested. It is found that the rate of convergence of the power control can be accelerated if the cancellation efficiency parameter can be directly incorporated into the power update. We also address the capacity resulting from this receiver in terms of the notion of effective bandwidth