DS/CDM 위성DMB 시스템 채널용량 증대를 위한 적응형 부분 병렬 간섭 제거기

Abstract

This paper analyzes the performance of both the proposed adaptive partial parallel interference cancellation(PPIC) scheme which can be applied to satellite DMB for downlink receiver and the conventional DS/CDM systems which employes the RAKE receiver over multipath fading channels. The proposed scheme adaptively updates the PCW according to the initial detection reliability, hence suppressing the MAI (Multiple Access Interference) for accurate detection of the desired broadcasting channel. Simulation results show that the proposed adaptive PPIC scheme remarkably improves both the channel capacity and bit error rate (BER) performance over multipath fading channels. The results, when Eb/N0 is 20dB and the BER is 1×10-3, show that the proposed systems can extend nearly 53 broadcasting channels, while the conventional DS/CDM systems may provide 10 broadcasting channels. Moreover, it should be noted that the performance of the adaptive PPIC scheme under 20 broadcasting channels nearly approaches the performance of the RAKE receiver with a single broadcasting channel. Thus the proposed adaptive PPIC scheme in DS/CDM systems may improve the potential channel capacity over multipath fading channels.