Optimal power distribution control under different total power constraint strategies for multicode MC-CDMA with zero-forcing successive interference cancellation

Multicode multicarrier CDMA (MC-CDMA) is a promising candidate for supporting multimedia services in future wireless communications. However, the performance of this system is limited by self-interference (SI) and multiuser interference (MUI). To mitigate this problem, a nonlinear zero-forcing successive interference cancellation (ZF-S1C) receiver is applied in this paper. Furthermore, to minimize each user´s bit error rate (BER), optimal power distribution control (PDC) is considered. Results show that in correlated Rayleigh fading channels, the multicode MC-CDMA system based on the ZF-SIC receiver with the optimal PDC remarkably out performs other receivers proposed in the literature. Moreover, the ZF-SIC integrated with the optimal PDC present significant performance advantage over that with the equal BER PDC, particularly under a short-term total transmit power constraint.