Desarrollo de un prototipo de comunicación inalámbrica en tiempo real basada en OFDM, que contenga diferentes tipos de mapeo, reformado de pulso y corrección de errores, empleando equipos SDR.

Abstract

In this work, a real-time wireless communication prototype is developed, by using Matlab and Software Defined Radio (SDR) devices. The practical prototype implements OFDM (Orthogonal Frequency Division Multiplexing) transmission method, the pulse shaping technique and error correction through convolutional coding. Each stage is approached starting with the theoretical part, followed by the implementation in Matlab and showing the corresponding partial results. After approaching all the stages, the prototype implemented in the graphic interfaces is described. The prototype allows to vary the mapping scheme (BPSK, QPSK, 16-QAM and 64-QAM) and to evaluate their effect on the bit error rate (BER). It also offers the possibility of activating or deactivating the pulse shaping and error correction technique, showing in real time its effect on the constellation diagram, on the information received and on the obtained BER, which allows the prototype to have a didactic character. With the same mapping scheme, pulse shaping and/or error correction allow to obtain an improvement in the BER, and by using the two techniques together results in the lowest error rate. Finally, due to the little information that exists worldwide, this work constitutes a point of lead for some previous works and therefore the level of detail generates a large number of pages, but ensures the understanding of each of the stages avoiding possible errors that they would be fatal.