H - Electricity – 04 – K
Patent
H - Electricity
04
K
H04K 1/00 (2006.01) H04B 1/707 (2006.01) H04B 1/713 (2006.01)
Patent
CA 2380607
The actual carrier frequency of a spread spectrum signal is found by tuning a pair of correlators (114) to a pair of search frequencies and then correlating the spread spectrum signal against one or more reference signals (116) to produce a pair of correlation magnitude values. The ratio of the difference between the correlation magnitude values to the sum of the correlation magnitude values determines the offset between the actual carrier frequency and an estimated carrier frequency.
La présente invention permet de trouver la fréquence de porteuse réelle d'un signal à spectre étalé en syntonisant deux corrélateurs (114) sur deux fréquences de recherche et en corrélant ensuite le signal à spectre étalé avec un ou plusieurs signaux de référence (116) pour obtenir deux valeurs d'amplitude de corrélation. Le rapport de la différence entre les valeurs d'amplitude de corrélation et la somme des valeurs d'amplitude de corrélation détermine l'écart entre la fréquence de porteuse réelle et une fréquence de porteuse estimée.
Froelich Robert K.
Fulton Forrest
Cellnet Data Systems Inc.
Cellnet Innovations Inc.
Smart & Biggar
LandOfFree
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