Method and apparatus for carrier phase tracking

Details Method and apparatus for carrier phase tracking Method and apparatus for carrier phase tracking

H - Electricity

04

L

H04L 27/233 (2006.01) H04L 7/027 (2006.01) H04L 27/38 (2006.01) H04L 7/04 (2006.01) H04L 27/00 (2006.01)

Patent

CA 2386418

A method and telecommunication system for tracking the carrier phase of a received signal (2, 4) includes the addition of a pilot signal (7) to the data component of the signal prior to modulation and transmission (100). The pilot signal (230) is to have a frequency equal to the inverse of twice a data symbol interval with zero crossings positioned at the midpoint of each symbol interval to avoid interference with the data. The received signal (230) is demodulated to produce a complex data signal from which the pilot signal is detected to provide an estimate of the phase error in the complex data signal (230). The elimination of the phase error from the complex data signal is accomplished through a corrective phase shift (240) that is equal and opposite to the estimated phase error.

L'invention concerne un procédé et un système de télécommunications permettant de localiser la phase de porteuse d'un signal reçu (2, 4), qui consiste à ajouter un signal pilote (7) à la composante de données du signal avant la modulation et la transmission (100). Le signal pilote (230) doit avoir une fréquence égale à l'inverse de deux fois un intervalle de symbole de données avec des passages au zéro dans le point médian de chaque intervalle pour éviter les interférences avec les données. On démodule le signal reçu (230) pour obtenir un signal de données complexe à partir duquel il est possible de déceler le signal pilote et de fournir une estimation de l'erreur de phase dans le signal complexe (230). L'élimination de la phase d'erreur dans le signal complexe s'effectue par décalage de phase de correction égale et opposée à l'erreur de phase estimée.

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