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Mobile communication systems based on DS-CDMA suffer from Multiple Access Interference (MAI), which limits the system capacity. Several techniques, such as beamforming with multiple antennas and MultiUser Detection (MUD), have proved to be effective to mitigate MAI. To reduce the complexity of MUD, it has been proposed to process users in smaller groups. The interference between group is then reduced using beamforming with smart antennas. In this paper, a new group-based block linear successive interference cancellation structure is developed. The structure is shown to provide BER performance close to the full space-time MUD at a lower computational cost.
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