Prácticas de transmisión de datos en radiofrecuencia empleando dispositivos de radio definida por software

Abstract

The main objective of this degree work is the creation of three laboratory practices that make use of software-controlled radio devices for the telecommunications area of ​​the Francisco José de Caldas District University. Given the lack of easy access for students to real communications that allow them to approach both the academy and the telecommunications industry, different types of communications are made hoping to cover a wide spectrum of knowledge. In the first place, a contextualization is presented that generates a theoretical and legal approach to frequency modulated transmissions, phase shift keying and OFDM type transmissions, to later give the first approaches to the world of SDR (Software Define Radio). With the help of the SDR Hack RF One and NUAND Blade RF and the GQRX, GNU Radio and MATLAB software, the implementations and simulations that allow the basis for the creation and operation of the laboratory practices will be carried out. Throughout the document the tests, calculations and implementations necessary to address the different types of desired communications are shown, firstly, an approach to the operation of our SDR devices is generated through the use of the GQRX console which provides us with a receiver of radio frequency without the need for an implementation in any type of software, after that for FM type communications, an audio transmitter and receiver is implemented, with music tracks as a source and with input via microphone in the GNU Radio and MATLAB software and for communications with QPSK modulation an audio transmitter and receiver is implemented in the GNU Radio software. For the OFDM type transmission, a simulation of an OFDM transmitter and receiver with medium effects is implemented in the MATLAB software, which allows the approach and the necessary understanding to subsequently implement an audio transmission with OFDM, a data transmission with OFDM and an IEEE 802.11a frame structured data transmission in the GNU Radio software. Throughout this degree work, the tests, the recommendations and the respective results obtained from the experimentation of the communications in question are shown, the design of a user manual is carried out with the explanation of the installation of the software and interfaces necessary for the operation of the practices, and the creation of three laboratory practices that cover the areas mentioned above is carried out.