Adaptively equalized burst receiver and method for upstream...

H - Electricity – 03 – H

Patent

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H03H 7/30 (2006.01) H04L 25/03 (2006.01) H04L 7/04 (2006.01) H04L 25/02 (2006.01) H04L 27/00 (2006.01)

Patent

CA 2295969

A digital mode receiver for the reception of signals from multiple independent subscribers, as on a cable television bidirection broadband data transmission system, adapted for subscriber inquiries and two way data transmission. Each burst (fig. 2) comprises a fixed preamble portion and a variable data portion. The received burst is sampled and fed to a sample storage buffer (4). The preamble portion's output is used to initialize an equalizer (6), and to synchronize carrier and modulation clock. By repeating the processing of the preamble and optionally all or part of each burst, accuracy of detection of the variable data is improved, so that it is feasible to receive individual burst without burst to burst coordination, while using a short preamble for increased efficiency.

L'invention concerne un récepteur numérique conçu pour la réception de signaux en provenance d'abonnés multiples indépendants, comme dans un système de transmission de données large bande bidirectionnelle pour télévision par câble, adapté pour des demandes de renseignement des abonnés et pour des transmissions de données bidirectionnelles. Chaque rafale (fig.2) comprend un préambule fixe et des données variables. La rafale reçue est échantillonnée et fournie à un tampon de stockage (4) d'échantillons. La sortie du préambule est utilisée pour initialiser un égaliseur (6) et pour synchroniser une porteuse et une horloge de modulation. On améliore la détection de données variables en répétant le processus de préambule et éventuellement tout ou partie de chaque rafale, ceci de manière à pouvoir recevoir des rafales individuelles sans une coordination rafale-rafale, tout en utilisant un préambule court en vue d'une meilleure efficacité.

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