Dissertation in the field of Signal Processing, Michal Cierny

The title of thesis is ”Contributions to analysis and mitigation of cochannel interference in cellular wireless networks”

A modern cellular network deployed in a densely populated area is also dense. In some places it is possible to see multiple base stations (cellular transceivers located on rooftops or masts) at the same time. For efficiency purposes, the base stations also operate in the same frequency band. This means that some of the multiple base stations (one transmitting to our cellphone, others transmitting to other users) may disturb our own connection.

In this dissertation we look at how high levels of such disturbance (a.k.a. interference) could be managed. There are several methods one could apply; if the interference is very strong, it may be better to allow only some of the transmissions to happen. In other cases it may be possible to direct transmissions in specific directions, thus avoiding disturbance of other users.

A network with manageable levels of interference leads to more reliable connections and happier customers. The research is applicable especially for 4G networks and beyond.

Opponent: Professor Chintha Tellambura, University of Alberta, Canada

Supervisor: Professor Risto Wichman, Aalto University School of Electrical Engineering, Department of Signal Processing and Acoustics