Investigation of Multiple-Antenna Techniques in 5G Mobile Systems

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Dr. Mráz János Albert
Department of Networked Systems and Services

For the telecommunication industry the biggest task nowadays is the creation of the forthcoming 5G cellular network. In the light of the topicality of this subject in my thesis work I had been occupied with multiple antenna techniques that reach beyond the 4G mobile system. In 4G systems multiple antenna techniques played an important role already for their use comes with undeniable gains. The applicability of multiple antenna techniques in the 4G system has reached its limits with 3GPP LTE release 12. Because of the physical size of the user equipment in the frequency bands that the system uses the upper bound has been reached in terms of antennae number.

The easiest way of achieving higher data rate is the increase of bandwidth. In the millimetre frequency band between 20 GHz and 90 GHz there are big unallocated chunks of frequency, which had been dismissed for use in cellular telephony according to previous findings. The latest findings research however has shown that these frequencies are convenient for outdoor cellular application, furthermore the high carrier frequency values are favourable as more number of antenna elements can be located in smaller space.

In the first part of my work an overview of the 4G systems radio interface takes place with emphasis on the multiple antenna techniques. Later on comes the overview of multiple antenna techniques in general. In the next chapter the requirements of the 5G system are presented. Then I discuss the millimetre wave radio channel and the possible multiple antenna architectures for a many antenna system that the literature mentions.

In the second part I describe a chosen millimetre wave channel estimation solution for single path channels, that I extend to be able to estimate multiple path channels and I make some modifications to it in order to achieve higher accuracy. I use these channel estimation methods to implement various systems. Relying on a source I implement an additional system too that is able to serve multiple users at a time. In the last part of my work I present my simulation results.


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