Method of and arrangement for determining the optimum position of the

Abstract

A method of and an arrangement for determining the optimum position of the reference tap of a master adaptive equalizer which adapts itself to variations of the transmission characteristics of a transmission channel in a digital system for transmitting data which are in general complex, such adaptation being effected by modifying sets of coefficients of transversal filters which modify the transmitted symbols. Simultaneously with the operation of the master adaptive equalizer, and in consecutive analyzing periods, a selection is made in accordance with a selection algorithm of the optimum positions of the reference taps of transversal filters in a slave adaptive equalizer, the coefficients of which are adapted in accordance with an adaptation algorithm. A comparison is made between the symbols supplied by the master and slave adaptive equalizers in accordance with an error criterion, and when the error criterion indicates that the slave adaptive equalizer provides the best results the reference tap position and coefficients thereof are transferred to the master adaptive equalizer.