Técnicas de modelagem e pré-distorção utilizando FPGA

Abstract

This work describes initially a system implemented in FPGA for the generation of a digital modulations. After, it describes a platform capable of performing the estimation of a device under test. Finally, it shows applications of this platform for pre-distortion purposes. A brief overview of the basic concepts involved in the dissertation are presented, as signals and systems in the discrete domain, FPGA, and Figures of Merit, tools used to measure the quality of the models. In chapter 3, a FPGA tool capable of generating signals with various digital modulations is presented. This platform will lately be used for identification and pre-distortion purposes. Chapter 4 shows the construction of efficient estimation algorithm using the Least Squares method. The identification of a filter using a pulse wave signal is shown in the section 4.2, and the resulting frequency domain curve is compared to that generated by a commercial equipment, where results show that the estimated model represents well a real filter. A pre-distortion model of a filter is shown in the chapter 5. The quality of the model is evaluated by four different Figures of Merit. Conclusions about the work and future research are drawn in the last chapter.