Graphic Tool for a Comparative between Fractionally Spaced Equalizers and Synchronous Equalizers

A.C. Ferreira, E.M. Lopes, and S.A. Fasolo (Brazil)


ISI, adaptive equalization, fractionally spaced equalization.


The objective of this paper is to implement a graphical interface using the Matlab® software, for comparative study of performance between fractionally spaced equalizers and synchronous equalizers in wireless communications systems. Traditionally, the equalization system works with a sampling rate equal to the transmitted symbols rate. The fractionally spaced equalization possesses a sampling rate superior to the symbol rate. Therefore, it is obtained a more efficient equalization when compared with synchronous equalizers. However the cost of this procedure is an increase in the amount of executed calculations, or either, increase of the computational load. The graphical interface makes possible to the user to choose different communication channels and to modify the equalizer parameters values. During the simulation we observe the behavior of the equalized data diagram, the taps gain of the equalizers and the MSE (Mean Square Error). The implemented technique of equalization uses LMS (Least Mean Square) algorithm and uses a LE (Linear Equalizer) structure.

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