Positioning in LTE Mobile Systems

OData support
Supervisor:
Dr. Imre Sándor
Department of Networked Systems and Services

During this semester, I worked on a project named Positioning in LTE Mobile Systems. I worked with the fourth generation mobile network – called LTE – and I studied the basics of the system and the supported locationing methods. I started by investigating the extant data of the subject: the basic methods of LTE were the first step; I had to understand the operation of the elements needed. After that I could start investing information about locationing methods: the GPS-based methods were the first topic and then I moved on to mobile systems and studied about the locationing methods of the previous generational mobile systems. After a brief outlook of WiMAX-based positioning services, I started to inspect the implementation of these methods in LTE.

My main project was to create my own testing and measurement environment. I searched for existing mobile system simulators for the core of my own system. MATLAB was the imagined environment and I tested many promising systems based on it, but in all cases the precision of time measuring was my only issue. I didn’t find proper solution for this problem, and because of this I moved on to a C++ based solution. But I realized that the mobile system simulator-based line doesn’t work in this case.

We asked the WINNER team about their channel model system called WINNER II. It’s perfect solution for the propagation channel simulations so I changed my point of view and started to use this tool. As a starting point I studied the model operation and the input/output parameters. After that I started to plan my own environment based on this model.

First I set the necessary parameters for the simulation and based on these I am calling the channel model. The implemented time measurement- and angle-based positioning methods are based on the output of model parameters. The latter works as I planned but the former isn’t working appropriately. I had some problems during the implementation what I couldn’t fix in time.

I worked together with two engineer colleagues in the time measurement-based positioning method part of this project.

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