시간선택적 페이딩 환경에서 멀티캐리어-CDMA 시스템의 서브캐리어간 간섭

Inter-carrier Interference of Multicarrier-CDMA System in Time Selective Fading Channel

In MC-CDMA systems effects of delay spread of the channel are reduced with increased symbol duration by simultaneously transmitting data symbols on the parallel subcarriers. However, the increased symbol duration causes the system to be more vulnerable to time selective fading. In other words, although MC-CDMA systems are robust against frequency selective fading in a multipath environment, they are sensitive to Doppler spread and hence inter-carrier interference is increased. In this paper, we investigate the effects of time selective fading characteristics of the mobile channel from the viewpoint of desired signal power to inter-carrier interference power ratio at the combiner output of the MC-CDMA receiver.