Constrained Cross-Cumulant Based Multiuser Detection for Uplink CDMA

In this paper, a cross-cumulant based blind multiuser detection scheme is proposed for an uplink CDMA system. By imposing a code-aided constraint on each user´s receiver and minimizing the cross cumulant of the output signals from all receivers, we show that the proposed approach is capable of detecting all users´ signals in parallel without user ambiguity. The global convergence of the proposed algorithm is established. The resulted detectors are proven to be zeroforcing ones. Furthermore, the constraints are treated as unknown parameters and jointly optimized with the receivers to achieve performance gain. Adaptive implementation is discussed. Simulation results verify the satisfactory performance of the proposed approach in typical communication scenarios.