Adaptive matched pre-filtering of a decision feedback...

Details Adaptive matched pre-filtering of a decision feedback... Adaptive matched pre-filtering of a decision feedback...

H - Electricity

04

L

H04L 25/03 (2006.01) H03H 15/00 (2006.01) H03H 17/00 (2006.01) H04L 25/08 (2006.01)

Patent

CA 2061930

An automatic equalizer includes an adaptive matched filter connected in front of a decision feedback equalizer of a conventional design. The adaptive matched filter has an A/D converter for sampling and quantizing an analog baseband signal into a digital signal, which is applied to a transversal filter. The transversal filter is supplied with tap coefficients adaptively controlled by a control signal generator which makes automatic adjustments to symmetrize the impulse response of a transmission path depending on the status of fading. The automatic equalizer can sufficiently equalize the fading in the range ~> 1 in which the reflected wave is stronger than the direct wave, which fading cannot be adequately equalized only by the conventional decision feedback equalizer.

L'invention est un analyseur automatique comportant un filtre adapté adaptatif connecté en amont d'un égaliseur récursif de conception courante. Ce filtre adapté adaptatif comporte un convertisseur analogique-numérique servant à échantillonner un signal de bande de base analogique et à quantifier celui-ci sous la forme d'un signal numérique, lequel est transmis à un filtre transversal. Ce filtre transversal utilise des coefficients de branchement commandés adaptativement par un générateur de signaux de commande qui effectue des ajustements automatiques pour symétriser la réponse impulsionnelle d'un trajet de transmission selon les conditions d'affaiblissement. L'égaliseur automatique de l'invention peut égaliser l'affaiblissement suffisamment dans la gamme ~> 1 où l'onde réfléchie est plus intense que l'onde directe, alors que cet affaiblissement ne peut être égalisé adéquatement par les égaliseurs récursifs de types courants.

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