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

摘要

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.