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1. WO1999005815 - SYSTEM AND METHOD FOR OBTAINING CLOCK RECOVERY FROM A RECEIVED DATA SIGNAL

Publication Number WO/1999/005815
Publication Date 04.02.1999
International Application No. PCT/US1998/015471
International Filing Date 24.07.1998
IPC
H04L 7/027 2006.1
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
7Arrangements for synchronising receiver with transmitter
02Speed or phase control by the received code signals, the signals containing no special synchronisation information
027extracting the synchronising or clock signal from the received signal spectrum, e.g. by using a resonant or bandpass circuit
H04L 7/033 2006.1
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
7Arrangements for synchronising receiver with transmitter
02Speed or phase control by the received code signals, the signals containing no special synchronisation information
033using the transitions of the received signal to control the phase of the synchronising-signal- generating means, e.g. using a phase-locked loop
H04L 25/49 2006.1
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
25Baseband systems
38Synchronous or start-stop systems, e.g. for Baudot code
40Transmitting circuits; Receiving circuits
49using code conversion at the transmitter; using predistortion; using insertion of idle bits for obtaining a desired frequency spectrum; using three or more amplitude levels
CPC
H04L 25/4921
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
25Baseband systems
38Synchronous or start-stop systems, e.g. for Baudot code
40Transmitting circuits; Receiving circuits
49using code conversion at the transmitter; using predistortion; using insertion of idle bits for obtaining a desired frequency spectrum; using three or more amplitude levels ; ; Baseband coding techniques specific to data transmission systems
4917using multilevel codes
4919using balanced multilevel codes
4921using quadrature encoding, e.g. carrierless amplitude-phase coding
H04L 7/0278
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
7Arrangements for synchronising receiver with transmitter
02Speed or phase control by the received code signals, the signals containing no special synchronisation information
027extracting the synchronising or clock signal from the received signal spectrum, e.g. by using a resonant or bandpass circuit
0278Band edge detection
H04L 7/033
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
7Arrangements for synchronising receiver with transmitter
02Speed or phase control by the received code signals, the signals containing no special synchronisation information
033using the transitions of the received signal to control the phase of the synchronising-signal-generating means, e.g. using a phase-locked loop
Applicants
  • GLOBESPAN SEMICONDUCTOR INC. [US]/[US]
Inventors
  • SCHOLTZ, William, H.
Agents
  • MCCLURE, Daniel, R.
Priority Data
09/045,43420.03.1998US
60/053,76725.07.1997US
Publication Language English (en)
Filing Language English (EN)
Designated States
Title
(EN) SYSTEM AND METHOD FOR OBTAINING CLOCK RECOVERY FROM A RECEIVED DATA SIGNAL
(FR) SYSTEME ET PROCEDE D'OBTENTION DE RECUPERATION DE RYTHME A PARTIR D'UN SIGNAL DE DONNEES REÇU
Abstract
(EN) A system (170) for the evaluation of a timing vector to determine whether reliable timing recovery may be established at a predetermined center frequency, or from a specific pilot tone in the received signal (53). According to the present invention, the timing vector is created using band edge filters (57, 59), a pilot tone timing recovery band pass filter (171), or other suitable means. The timing vector is then sampled a predetermined number of times. The sampled timing vectors are plotted on a complex plane to evaluate (103) the general distribution of the sampled timing vectors. Timing recovery is then established using an acceptable timing vector as determined by comparing the distribution of the sampled vectors with a predetermined distribution threshold. In particular, a narrow distribution indicates minimun signal noise, interference, or disruption, whereas a wide distribution indicates the opposite. The instant invention also includes a means (103) of evaluating the timing vector at several center frequencies in the case of band edge timing recover until an acceptable timing vector is found.
(FR) L'invention concerne un système d'évaluation d'un vecteur de synchronisation permettant de déterminer s'il est possible d'établir une récupération de rythme fiable à une fréquence centrale prédéterminée, ou à partir d'une fréquence pilote spécifique dans le signal reçu. Selon la présente invention, le vecteur de synchronisation est créé à l'aide de filtres en bordure de la bande, d'un filtre passe-bande de récupération du rythme de la fréquence pilote ou d'autres moyens convenables. Le vecteur de synchronisation est ensuite échantillonné un nombre de fois prédéterminé. Les vecteur de synchronisation échantillonnés sont tracés sur un plan complexe afin d'évaluer la distribution générale des vecteurs de synchronisation échantillonnés. La récupération du rythme est ensuite établie à l'aide d'un vecteur de synchronisation acceptable tel qu'établi par comparaison de la distribution des vecteurs échantillonnés avec un seuil de distribution prédéterminé. En particulier, une distribution étroite indique un minimum de bruit, d'interférence ou de rupture de signal, alors qu'une distribution large indique le contraire. La présente invention concerne également un moyen d'évaluation du vecteur de synchronisation à plusieurs fréquences centrales, dans le cas de la récupération de rythme en bordure de la bande, jusqu'à ce que l'on trouve un vecteur de synchronisation acceptable.
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