Method and apparatus for modifying a decision-directed clock...

H - Electricity – 04 – L

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H04L 7/00 (2006.01) H04B 1/40 (2006.01) H04L 7/02 (2006.01) H04L 7/04 (2006.01) H04L 7/10 (2006.01) H04Q 7/32 (2006.01) H04L 7/033 (2006.01)

Patent

CA 2102407

The present disclosure includes a discussion of a decision-directed clock recovery system which includes circuitry to prevent false-locking and accelerate acquisition on a known symbol patterns. The clock recovery system has at least two control circuits. Each control circuit has an effective bandwidth and also generates a clock signal. The clock recovery system samples the received data signal using at least two clock signals (573, 575), forming a corresponding first and second sampled signal. The sampled signals are used to generate corresponding symbol decisions (581, 583). The symbol decision signals are processed to detect a known symbol pattern in the received data signal (513). Upon detection of the known bit sequence, the characteristics of the clock recovery system are modified, namely, the effective bandwidth of the control circuits are modified (527).

La présente invention porte sur un système décisionnel de recouvrement de signaux d'horloge comprenant des circuits qui servent à empêcher les verrouillages erronés et à accélérer l'acquisition des configurations de symbole connues. Le système de recouvrement de l'invention comprend au moins deux circuits de commande. Chacun d'eux a une largeur de bande effective et produit un signal d'horloge. Le système de recouvrement échantillonne le signal de données reçu en utilisant deux signaux d'horloge (573, 575) au moins et produit un premier et un second échantillon de signal correspondant. Ces échantillons sont utilisés pour produire des signaux de décision de symbole correspondants (581, 583). Ces signaux subissent un traitement qui cherche à détecter les configurations de symbole connues dans le signal de données reçu (513). Quant une suite binaire connue est détectée, les caractéristiques du système de recouvrement de signaux d'horloge sont modifiées; plus exactement, les largeurs de bande effectives des circuits de commande sont modifiées.

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