Implementação de um Equalizador Adaptativo em FPGA Utilizando o Algoritmo CORDIC

Abstract

—In this paper we present a FPGA implementation of an adaptive equalizer using the trigonometric LMS algorithm. The trigonometric functions needed for filtering and coefficient adaptation are evaluated with CORDIC rotations. This algorithm needs a hypercube definition, in which the minima of the objective function must be contained. This paper proposes the adoption of the multisplit procedure to ease the hypercube definition. Simulations show that, when using this procedure, the algorithm converges without the need for an exaustive search for the hypercube coordinates.