Method and system for spurious signal control in receivers

H - Electricity – 04 – B

Patent

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H04B 1/26 (2006.01)

Patent

CA 2566476

A method and system for dynamically shifting spurious tones away from the desired frequency in a virtual local oscillator receiver, such that any undesired signal residing at such spurious tones are effectively delineated from the desired signal and removed from the RF input signal. The system detects the presence of potential undesired blocker signals in the RF input signal, and initiates an iterative power comparison and mixer signal adjustment loop. As the virtual local oscillator uses two mixer signals, the frequency of one of the mixer signals is adjusted during the loop until the power of the down-converted signal is minimized to a predetermined level. Minimized power in the down-converted signal is indicative of the absence of the blocker signal, since the presence of a relatively high power signal is indicative of a blocker signal overlapping with a desired signal.

L'invention porte sur un procédé et sur un système d'éloignement dynamique de sons parasites de la fréquence désirée dans un récepteur virtuel d'oscillateur local de sorte que tout signal non désiré résidant au niveau de ces sons parasites soit efficacement séparé du signal désiré et éliminé du signal radiofréquence d'entrée. Le système détecte la présence de signaux potentiels bloquants non désirés dans le signal radiofréquence d'entrée et déclenche une comparaison itérative de puissance et un circuit mélangeur d'ajustement du signal. Lorsque l'oscillateur local virtuel utilise deux signaux du mélangeur, la fréquence de l'un des signaux du mélangeur est ajustée pendant la boucle jusqu'à ce que la puissance du signal converti vers le bas soit minimisée à une intensité prédéterminée. La puissance minimisée dans le signal converti vers le bas indique l'absence du signal bloquant du fait que la présence d'un signal de relativement haute puissance indique un signal bloquant chevauchant un signal désiré.

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