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Interference is one of the key factors in determining the capacity and performance of CDMA (Code Division Multiple Access) systems. In forward link, interferences consist of non-stationary process from the multipath of the same cell and stationary Gaussian process resulting from the background noise and interfering signals of other cells, which vary according to the number of multipaths and mobile's position. In this paper, we investigated the interfezence characteristics and the required &,/It in WCDMA environments adopting the described interference model. The forward link capacity can be obtained from the results under uniform user distribution throughout the cell. The effect of outer loop power control on the capacity, by which the received EblIt is set ezactly to the target value at each position, is also investigated.

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