A system and method for recovering symbol timing offset and...

H - Electricity – 04 – L

Patent

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Details

H04L 1/04 (2006.01) H04H 20/00 (2009.01) H04J 11/00 (2006.01)

Patent

CA 2362029

The system for recovering symbol timing offset and carrier frequency error from an orthogonal frequency division multiplexed (OFDM) signal includes a receiver circuit for receiving an OFDM modulated signal representing a series of OFDM symbols, and providing a received signal to an output thereof. A peak development circuit is included for developing a signal having a plurality of signal peaks representing symbol boundary positions for each received OFDM symbol, where each of the signal peaks is developed responsive to an amplitude and phase correspondence produced between the leading and trailing portions of each of the received OFDM symbols. The system includes a circuit for enhancing the signal peak detectability, which includes a circuit for additively superimposing and then filtering the signal peaks, to produce an enhanced signal peak having an improved signal-to-noise ratio. A circuit for establishing a temporal position indicative of the symbol boundary position from at least one of the enhance signal peaks output from the signal enhancing module is also provided. Further, a circuit for recovering the received OFDM signal carrier frequency error corresponding to the temporal position is included.

L'invention concerne un système permettant de récupérer un décalage de synchronisation de symbole et une erreur de fréquence porteuse à partir d'un signal à multiplexage par répartition de fréquence orthogonale (OFDM), qui comprend un circuit de réception destiné à recevoir un signal modulé OFDM représentant une série de symboles OFDM, et à fournir un signal reçu à une entrée dudit circuit. Un circuit de développement de crêtes permet de développer un signal possédant une pluralité de crêtes représentant des positions limites de symbole pour chaque symbole OFDM reçu, chaque crête étant développée en fonction d'une correspondance de phase et d'amplitude établie entre les parties tête et queue de chaque symbole OFDM reçu. Ledit système comprend un circuit permettant d'améliorer la détectabilité d'une crête, qui comprend un circuit permettant de superposer, puis de filtrer lesdites crêtes, et de produire une crête améliorée présentant un rapport signal-bruit amélioré. L'invention concerne également un circuit permettant d'établir une position temporelle indicatrice de la position limite d'un symbole, à partir d'au moins l'une des sorties de crête de signal du module améliorant ledit signal. L'invention concerne, en outre, un circuit permettant de récupérer une erreur de fréquence porteuse d'un signal OFDM reçu correspondant à la position temporelle.

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