IMPLEMENTACIÓN DE UN SISTEMA GENERADOR Y ELIMINADOR DE ECO CON FILTRO ADAPTATIVO USANDO EL ALGORITMO LMS EN UN FPGA ARTIX-7 (IMPLEMENTATION OF AN ECHO GENERATOR AND ELIMINATOR SYSTEM WITH ADAPTIVE FILTER USING LMS ALGORITHM IN AN ARTIX-7 FPGA)

Enrique Gerardo Hernández Vega, José Luis Chacón Muñoz, Jesús Alejandro Navarro Acosta

Resumen


Resumen

En este trabajo se presenta una forma de realizar un procesamiento de señales a través de filtros digitales en sistemas basados en FPGA para dos situaciones distintas: cuando se conoce el modelo a implementar y cuando no se conoce. En este último caso se recurre a los filtros adaptativos, que usan parámetros ajustables basados en un modelo de predicción estadístico. La aplicación es en concreto para el fenómeno de eco, el cual se genera en un FPGA y se elimina en otro. Para la generación se aplicó la ecuación en diferencias, y para la eliminación se usó un filtro adaptativo LMS de orden 40 creado con la herramienta HDL Coder de MATLAB, obteniendo resultados de atenuación de hasta 1/10 de la componente no deseada. El aporte principal de esta investigación es el método de implementación, diseñado con pocos recursos usando la versión gratuita del ambiente de desarrollo Vivado de Xilinx.

Palabras Claves: Eco, Filtros adaptativos, FPGA, LMS.

 

Abstract

In this paper a form of signal processing is presented through digital filters on FPGA based systems for two different situations: when the desired model is known, and when is not; in the latter case, adaptive algorithms are the alternative, which use adjustable parameters that are based on a statistical prediction model. The concrete application is in the echo phenomena, which is generated in one FPGA and eliminated in another. For generation, difference equation is applied, and for cancellation, it was used an 40th order LMS adaptive filter created with HDL Coder tool of MATLAB, getting attenuation results up to 1/10 of the undesired component. The main contribution in this work is the implementation method itself, which is designed to use lower resources, using a free-version of the Xilinx Vivado development environment.

Keywords: Adaptive filters, Echo, FPGA, LMS.


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Referencias


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