The equalization of non-minimum phase channels by means of a transversal filter becomes quite complicated when the real conditions are different from the ideal ones. The optimum delay that must be applied to the reference signal in order to make the equalization of the channel with a linear filter possible, is usually not known. Even if it is known, the channel can be nonstationary and w to find a linear equalizer optimum for all the possible situations may be difficult. On the other hand, the solution of increasing the length of the transversal filter can not be afforded when the signal-to-noise ratio is low. In this context, a non-linear filter called the K-filter is introduced as a good altemative to classical linear equalizers. As it will be seen below, the K-fllter is built on a strong theoretical approach and this fact gives the certainty that good results will be obtained if the K-filter is considered whenever a non-linear fllter is required.

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