Theoretical capacity evaluation of power controlled CDMA downlink with code limitation

This paper presents a method for the theoretical evaluation of downlink (DL) capacity, taking into consideration both orthogonal code limitations and transmit power control. Capacity is defined as the number of given users per cell for which the outage probability will be at a given level. The author developed a distribution function for signal reception power from which outage probability can be calculated. Crucial to the method is the introduction of the average power control level into the distribution function, making it unnecessary to consider the individual transmit power level for multiple mobile stations (MSs) located at a single service area. In order to be able to do this, an equation have been developed by which it is possible to determine average power control levels. The results achieved with the method agree well with those arrived at in multi-cell multi-user system simulations, and the computation time was much shorter, which suggests great promise for this approach in the design of an efficient DLs