This work contains link and network level analyses of a CDMA based system made from network planning point of view. As a result of the analyses we outline the requirements and possible methods for network planning.
First we analyse the CDMA system by using a very simple model. As result of the analysis we can conclude on the nature of the system outage in case of overload. We are able to answer to the questions how the capacity depends on the location of users in the cell, speed of users, and target CIR value. This results give us conditions and parameters which should be considered in the network planning.
As a result of the link level studies we generate a model of the interference in up- and downlink. The analysis gives us the dependency between users speed and target signal to interference ratio. In order to derive this dependency we develop models for optimal power control and signal to interference ratio. The analysis shows that the simple relay type of power control performs quite near to the optimal limit. The model for interference shows that in downlink the interference depends on the channel response and us such impacts directly the capacity.
The capacity of a CDMA system is estimated usually by simulations. We propose a method for calculating the average system capacity. Compared to simulations the calculation allows significantly to speed up the capacity estimation process. By comparing with the simulations results we show that the proposed method approximates well the cases when users or base stations are nonuniformly distributed.
At the end of the thesis we show how the proposed method is integrated into planning of a power controlled CDMA system. The developed method can be used for estimating the outage areas and blocking probabilities.