The demand for transferring data faster over mobile networks has highly increased over the years. One way to reach a higher transfer rate is the use of two-tier networks and femtocells inside macrocells. The femtocell is a base station with low range and low output power, which usually can be used in houses and offices as an indoor service to increase the coverage and data transfer rate. To reach higher speed, the data traffic of the femtocell is transmitted with wire technology, which also decreases the data traffic of the macrocell. However, this can cause interference, after installing a certain amount of femtocells the service may go down.
This thesis deals with the creation of a simulating environment, where network interference situations can be modelled in MATLAB (both cases OFDM downlink or WCDMA uplink). Here we have two simulations presented. In the simulation of WCDMA the theoretical service outage area can be calculated in any point, in the case of OFDM the simulation can calculate the data transfer rate changes depending on the number of femtocells.