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A theoretical characterization of intracell and intercell interference statistics in cellular direct-sequence code-division multiple-access systems in a multipath environment is presented considering both fast and slow power control. Unlike many of the previous papers, mobiles are assumed to connect to a base station according to a minimum attenuation criterion, also known as base station diversity. Interference statistics are used to estimate system capacity and results have been validated by Monte Carlo simulations. Our results confirm that much greater capacity can be achieved when multipath fading is compensated by power control, while the relative benefits of perfect compensation of multipath fading decreases as the number of resolvable paths at the receiver increases.Index Terms-Cellular systems, code-division multiple access (CDMA), interference statistics, power control.

In this paper we show the results of the evaluation of the downlink capacity of CDMA systems by using simulation. The proposed simulator analyses the system performance along time by means of measuring the power received by each mobile terminal from its own cell site and the total energy from all the cell site transmitters. Both measurements depend on path losses and on the traffic model. The introduction of the behavioural models of a wide range of services, which are expected to be supported by third generation (3G) wireless networks, is the most important benefit of the proposed simulation technique. A 3G system such as UMTS (Universal Mobile Telecommunication System), based on WCDMA, is evaluated considering voice traffic and a complex data traffic such as web browsing.

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