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Study and simulation of waveforms for 5G systems

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2015-06-19
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2015-07-03
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This report represents the last and most important document I have made during my time in the university. The main idea that surrounds all this work is the elaboration of a source code by a student for students. Because of that, the simulation is based in MATLAB and oriented to be as changeable as possible to allow people with a medium knowledge of this program to understand and modify it. The initial step of this project is the simulation of an Orthogonal Frequency-Division Multiplexing (OFDM) system and its later validation. The system applies the fundamental orthogonality principles of the signals and creates a multiple carrier waveform including a modulated symbol in each carrier. This systems are usually in a certain central frequency with established bandwidth in the frequency spectrum. In this case the situation is a low-pass equivalent simulation only to see the waveform and error results of the modulation/demodulation process. The motivation for this report comes from the implementation of the 5G network in mobile communication and the uncertainty of the new OFDM waveform. There are two systems that have real chances to become the new waveform: Zero Tail based OFDM and Filter Bank Multicarrier based OFDM. The 5G networks are the immediate future for mobile communications and their development has to be in the hands of the system performance instead of the different companies’ interest. To be impartial developing this new systems requires an academic point of view in favor of the better solution possible for the new mobile networks. The aim of this simulation is to be able to compare this new systems with a working model of the standard OFDM. In this report it was only possible to study and analyze the Zero Tail based OFDM leaving the rest for future projects. However the simulation goal is to be as adaptable as possible, the channel models implemented in the source code are Long Term Evolution (commonly known as 4G) because of the drive of this new OFDM waveforms. The ideal situation to this experiments would be working with the 5G channel models (which are not decided yet), but it would be accurate enough to start with the already established ones.
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