Signal acquisition system for spread spectrum receiver

Details Signal acquisition system for spread spectrum receiver Signal acquisition system for spread spectrum receiver

H - Electricity

04

B

H04B 1/7077 (2011.01)

Patent

CA 2385111

The invention relates to a device detecting a demodulated signal received by a spread spectrum receiver and converted into digital samples. The device is characterized by comprising a matched filter (4-16) for calculating the correlation between an incoming signal and at least one reference signal; an oscillator (4-8) for generating a sampling frequency; a sampling circuit (4-10) for re-sampling said demodulated digital sample signal at said sampling frequency, which is such that the timing of samples of the reference signals of the matched filter (4-16) corresponds to the timing of a sample signal going from the sampling circuit to the matched filter (4-16); and a multiplier (4-12) in which the sample signal is multiplied by a carrier replica generated locally before the sampling circuit or thereafter, to remove the carrier from the sample signal.

L'invention concerne un dispositif détectant un signal démodulé transformé en échantillons numériques et reçu par un récepteur à spectre étalé. Le dispositif comprend un filtre adapté (4-16) destiné à calculer la corrélation entre un signal entrant et au moins un signal de référence ; un oscillateur (4-8) destiné à générer une fréquence d'échantillonnage ; un circuit d'échantillonnage (4-10) destiné à échantillonner à nouveau ce signal d'échantillon numérique démodulé à une fréquence d'échantillonnage qui est telle que la synchronisation des échantillons des signaux de référence du filtre (4-16) corresponde à la synchronisation du signal d'échantillon parcourant la distance séparant le circuit d'échantillonnage et le filtre (4-16); ainsi qu'un multiplicateur (4-12) dans lequel le signal d'échantillon est multiplié par une réplique de porteuse générée localement avant ou après le passage du circuit d'échantillonnage de manière à éliminer la porteuse du signal d'échantillonnage.

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