Apparatus for doppler correction in a wireless...

Details Apparatus for doppler correction in a wireless... Apparatus for doppler correction in a wireless...

H - Electricity

04

B

H04B 7/01 (2006.01) H04B 7/208 (2006.01)

Patent

CA 2383452

Apparatus for Doppler correction in a wireless communications system (100), including a first frequency synthesizer (402A) for generating a carrier signal (210) oscillating at a rate responsive to a first input (424), a counter coupled (404) to the first input (424) for generating a Doppler compensation signal (426), the counter (404) having a clock input, and a second frequency synthesizer (402B) coupled to the clock input for generating a clock signal (420) oscillating at a rate responsive to a rate input (422). The rate input (422) is adjusted over time according to a predetermined sequence so that the Doppler compensation signal (426) compensates for the Doppler effect experienced by, for example, ground-to-satellite communications in a satellite communications system.

Appareil servant à effectuer une correction Doppler dans un système de communication sans fil (100). L'appareil comprend un premier synthétiseur de fréquences (402A) qui produit un signal porteur (210) oscillant à un débit tributaire d'une première entrée (424); un compteur (404) couplé à la première entrée (424) pour produire un signal de correction Doppler (426), ledit compteur (404) comportant une entrée pointée; et un second synthétiseur de fréquences (402B) couplé à l'entrée pointée pour produire un signal d'horloge (420) oscillant à un débit tributaire d'un débit entré (422). Le débit entré (422) est réglé dans la durée selon une séquence préétablie de sorte que le signal de correction Doppler (426) corrige l'effet Doppler survenant, par exemple, dans des liaisons terre-satellite dans un système de communications par satellite.

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