Optimal Sequences to Suppress the Multiuser Interference in the Downlink of the TDD-CDMA Systems

摘要

Conventional multiuser interference canceling is always done in the uplink. In this paper, a novel multiuser in- terference cancelling scheme is introduced. It can be used in the downlink of the TDD-CDMA systems. The multiuser interfer- ence canceling is done through the joint optimization of both the spreading and despreading waveform for different users, instead of the despreading code only. The idea is to take the advantages of exploitation, rather than mitigation, of the multipath propaga- tion effects.