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In this paper, for the purpose of better performance with lower complexity in UWB communications, we propose a novel Block-Interleaved Multi-code (BIM)-CDMA system with zero/low correlation zone (ZCZ/LCZ) spreading sequences acting as PN codes. Based on ZCZ/LCZ sequences, this system can effectively deal with dense multipath channels by combining the energy of multipath signals and avoiding inter-chip interference (ICI) and intersymbol interference (ISI). Also a new ZCZ sequence is developed for the system to obtain better performance. Simulation results show that the performance of the BIM-CDMA system is considerably improved over that of the direct sequence (DS)-CDMA systems.