Frequency cancelling system and method

H - Electricity – 04 – B

Patent

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Details

H04B 15/00 (2006.01) H04B 1/12 (2006.01) H04B 1/52 (2006.01) H04B 1/40 (2006.01)

Patent

CA 2215721

A frequency cancelling system is disclosed which improves reception of a communication signal which is transmitted at a communication frequency in the presence of an interference signal which occurs at the same communication frequency. The frequency cancelling system generates a reference signal at the communication frequency, and adjusts the reference signal to be opposite in phase and equal in amplitude to the interference signal. The reference signal and the communication signal are then combined to cancel the interference signal. In a preferred embodiment, the reference signal is generated from the same source as that from which the interference signal arises. Preferably, the interference signal is received during an interval in which the communication signal is not being transmitted, and the reference signal is adjusted to be opposite in phase and equal in amplitude to the interference signal during that interval.

Système de suppression de fréquences améliorant la réception d'un signal transmis à une fréquence donnée en présence d'un signal brouilleur se produisant à la même fréquence de transmission. Le système de suppression de fréquences génère un signal de référence à la fréquence de transmission et règle le signal de référence de manière à ce qu'il soit en phase opposée et d'amplitude égale par rapport au signal brouilleur. Le signal de référence et le signal de communication sont ensuite combinés pour supprimer le signal brouilleur. Dans une application préférée, le signal de référence est généré par la même source que celle d'où provient le signal brouilleur. De préférence, le signal brouilleur est reçu pendant un intervalle durant lequel le signal de transmission n'est pas transmis, et le signal de référence est réglé de manière à être en phase opposée et d'amplitude égale par rapport au signal brouilleur pendant cet intervalle.

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