Digital Modulations and Their Filtering for High Speed Data Transmission

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Dr. Csurgai-Horváth László
Department of Broadband Infocommunications and Electromagnetic Theory

Nowadays, the digital wireless data transmission plays a major role in communication, think about satellite HD television broadcasting, mobile telecommunications or Wi-Fi. In order to get the information you want to transmit (for example, picture or sound) from the transmitter to the receiver, digital modulation is required. Due to the advancement of technology, modulation procedures have been developed for improved data transfer, from which the state-of- the-art is the APSK modulation. Owing to the growing number of different parallel data transfers and the increasing volume of data streams, the frequency bands became more saturated, therefore the occupied bandwidth became crucial. To solve this problem, various filtering methods are used for the sake of the data streams occupy less bandwidth.

The purpose of my Bachelor thesis is to implement a realistic simulation model of digital modulation in MATLAB Simulink and to compare the different modulation procedures with the help of the BER and SER curves obtained by the simulation.

In the beginning chapters, my thesis reviews the structure of the data transfer and introduces the current modulation and filtering techniques for which the simulations are based. Following the theoretical review, I present the structure of the simulation models based on the known modulation and filtering procedures and describe their operation in the following chapters. At last, I complement my APSK model with two different types of channel encoding and filtering for more realistic data transfer.

At the end of my thesis, I evaluate the BER and SER figures obtained as a result of the simulations and summarize the work done.


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