Frequency reuse efficiency in CDMA systems: from an uniform to a bell-shaped traffic distribution

The frequency reuse efficiency for the reverse channel of a code division multiple access cellular system is obtained for different propagation environments and non-uniform traffic scenarios. The propagation environment is defined by its path loss coefficient and the traffic scenario as a two-dimensional Gaussian function which leads to a bell-shaped traffic distribution. The research is detailed for the case in which the peak of the two-dimensional Gaussian function is located at the same position of the central cell-site as that where the parameter F is obtained. For the other cell-sites the parameter is also obtained, but in a limited number of situations. This allows the use of a different efficiency factor for each cell of the system, instead of a constant value. The influence of the frequency reuse efficiency on the cell radius is also investigated for a particular case in which an analytical solution is derived. This analysis shows the strong impact of this factor on the cell area.