Doppler Shift Compensation in LEO Satellite Communication
Keywords:
Carrier frequency offset (CFO), Frequency synchronization, MATLAB simulation, Satellite communication, Terminal-side compensationAbstract
Low Earth Orbit (LEO) satellites travel at high velocities relative to ground terminals, which introduce significant Doppler shifts in the received signals. These frequency offsets degrade synchronization, increase error rates, and reduce spectral efficiency if left uncompensated. In this work, a terminal-side Doppler compensation technique is implemented, where Doppler frequency is estimated using orbital parameters and then corrected at the receiver. A MATLAB simulation is carried out with a 2 GHz carrier and a relative velocity of 7,500 m/s, resulting in a Doppler shift of approximately 50 kHz. The received waveform with Doppler distortion is compensated through frequency correction, and the results demonstrate successful recovery of the original signal. The study highlights the necessity of Doppler shift compensation to ensure reliable communication and efficient spectrum utilization in LEO satellite systems.
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