APPARATUS FOR DOPPLER CORRECTION IN A WIRELESS COMMUNICATIONS SYSTEM

摘要

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 (401B) 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.