Apparatus for interference compensation in a digital microwave relay system

摘要

A simple interference compensator for compensating interference waves with long delay times which are generated during digital microwave communications system-based relaying of waves at a single frequency, which receives a demodulated digital signal which is then passed through shift registers with different delay times and then through a forward equalizer, a first backward equalizer, a second backward equalizer and a center equalizer, all being transversal type equalizers, outputs from which are added as an output.;The compensator is equipped with a delay time control circuit which monitors the tap coefficients of the forward equalizer, the backward equalizers and the center equalizer and controls the delay times of the shift registers so that the tap coefficients become greatest at the center delay circuits of the respective transversal type filters.