The interference reduction and spectrum efficiency benefits of power control in future PMR systems

The effects of power control implementation on adjacent channel interference probability in PMR (private mobile radio) systems has been investigated both analytically and by simulation. The analytical approach was used to address the benefits of power control in the situations in which the base stations are co-located, where as Monte Carlo simulation was used to determine the effectiveness of power control in more general scenarios. In these studies, the impact of adjacent channel interference has been calculated in terms of the statistical likelihood of varying degrees of coverage shrinkage. The results show that power control efficacy strongly depends on dynamic range and threshold level, while being relatively insensitive to the number of steps. On this basis, it is shown that power control can be used as a powerful tool to reduce adjacent channel interference at the same time as providing a more precise basis for determining transmitter specifications for future PMR systems such as TETRA