Transceiver with local oscillator frequency settings using...

Details Transceiver with local oscillator frequency settings using... Transceiver with local oscillator frequency settings using...

H - Electricity

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J

H03J 7/06 (2006.01) G06F 11/00 (2006.01) H03L 7/23 (2006.01) H04B 7/185 (2006.01) H04L 7/04 (2006.01) H04L 12/56 (2006.01) H04L 27/22 (2006.01) H04L 29/06 (2006.01) H04N 7/24 (2006.01) G06F 11/14 (2006.01)

Patent

CA 2386745

A communication system extracts a received modulation frequency from baseband modulation. This frequency is used as a reference to control the output of a variable oscillator. The output of the variable oscillator may be used to generate a transmit upconversion frequency, and may also be used to perform a downconversion from IF to baseband during receive operations.

L'invention concerne un système de communication servant à extraire une fréquence de modulation reçue à partir d'une modulation en bande de base. Cette fréquence est utilisée comme référence pour commander le signal de sortie d'un oscillateur à fréquence variable. Le signal de sortie de cet oscillateur à fréquence variable peut servir à effectuer une élévation de fréquence d'émission, mais également à abaisser cette fréquence en la faisant passer d'une F.I. à une bande de base au cours d'opérations de réception.

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