Multiuser Detection for MC-CDMA System Using an RQP Approach

A recursive quadratic programming (RQP) approach is proposed for multiuser detection in multicarrier code-division multipleaccess (MC-CDMA) systems. In this approach, the combinatorial problem associated with the optimal maximum likelihood (ML) detection is relaxed to a quadratic programming (QP) problem first and then a recursive approach is developed to improve the detection performance. Computer simulations are presented which demonstrate that the detector developed based on the proposed approach offers close-to-optimal symbol-error rate (SER) performance which outperforms several existing suboptimal detectors. key words: quadratic programming, recursive approach, multiuser detection, M-ary modulation, MC-CDMA