Diseño, simulación e implementación del esquema de modulación ofdm y de la ecualización en el dominio de la frecuencia

Abstract

This project involves the implementation of OFDM multiplexing technique and an application of this for the ISDB -Tb standard. This work is based on the simulation and implementation of each of the blocks corresponding to the OFDM technique analysis, such as modulation blocks, nulltones, cyclic prefix, the FFT/IFFT, etc. through the LABVIEW software for later use in the NI USRP . First a brief explanation of the OFDM technique is performed and how it allows efficient spectrum utilization, among other benefits such as robustness against ISI, crosstalk between adjacent channels and the multi - paths. Then we start with building blocks that make up the OFDM system as well as extras blocks modulation and demodulation schemes that are the basis for a more complete and comprehensive analysis of our system. Finally the system is subjected to several tests to observe and verify the operation of the algorithms developed against real conditions as frequency offset variation, Raleigh channel selective fading, etc.