Automatic gain control for reducing effects of jamming

Details Automatic gain control for reducing effects of jamming Automatic gain control for reducing effects of jamming

H - Electricity

03

G

H03G 3/20 (2006.01) H04B 1/10 (2006.01) H04B 7/185 (2006.01) H04K 3/00 (2006.01)

Patent

CA 2121684

Improved automatic gain control (18) for an amplifier (10) is obtained by controlling the size of a null zone in a drive signal (26) for the amplifier (10). The size of the null zone is controlled by estimating strength of an interference signal, and dynamically varying the size of the null zone based on the estimated strength of the interference signal. As a result, the amplifier (10) rarely saturates, regardless of signal strength. The invention is useful to reduce the harmful effects of jamming or interference.

On réalise un contrôle automatique de gain amélioré (18), destiné à un amplificateur (10), en modulant l'étendue d'une zone zéro d'un signal d'attaque (26) destiné à cet amplificateur (10). Cette modulation se fait par estimation de l'intensité d'un signal de brouillage intentionnel, intensité en fonction de laquelle on fait varier de manière dynamique l'étendue de la zone zéro. Ainsi, l'amplificateur (10) sature rarement, quelle que soit l'intensité du signal. Cette invention est utile pour réduire les effets préjudiciables de brouillages, éventuellement intentionnels.

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