Acknowledgments

Working on this master thesis has both been a challenge and an adventure. A challenge, because of all the problems one faces along the way of realizing a project. An adventure, because of the chance to see how a fragile and tiny idea grows into a working prototype. The road was long and winding, and I couldn’t have traversed it without the help of the people who were next to me during the journey. I would like to express my enormous gratitude to: • Stefan Hellkvist, Research Engineer at Ericsson AB, for the motivation and assistance throughout the working process. Apart from the technical part of our mutual work, he devoted a lot of his precious time just to be here for me when I was both happy and sad with the results. • György Dan, Assistant Professor at Electrical Engineering department at Kungliga Tekniska Högskolan, for his invaluable guidance and advices, as well as for his objective criticism. • My mother Zoya and my father Todor for their support. They were celebrating with me every success and suffering each failure throughout the course of the work. To all of you: THANK YOU! You are amazing