THIRD GENERATION MOBILE RADIO SYSTEMS (IMT-2000) USING WIDEBAND CDMA TECHNOLOGY AND INTERFERENCE CANCELLER FOR ITS BASE STATION

This paper introduces the IMT-2000 third generation mobile radio system, which is expected to become the new worldwide infrastructure for advanced mobile computing. This paper also introduces the multi-stage parallel interference canceller (MPIC) which has been developed for the IMT-2000 base station. MPIC is a powerful technique for enhancing the uplink channel capacity. Direct sequence code division multiple access (DS-CDMA) is one of the most promising radio access technologies for IMT-2000 because of its capability of flexible multi-rate transmission and its high spectrum efficiency. However, the channel capacity of a DS-CDMA system is restricted by co-channel interference due to imperfect orthogonality between channels. We confirmed by computer simulation that applying our proposed 2-stage MPIC to a DS-CDMA base station increases the cell capacity on a multi-path fading channel to about 2.2 times that of a conventional receiver under the same conditions.

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