Journal of Beijing University of Posts and Telecommunications

  • EI核心期刊

Journal of Beijing University of Posts and Telecommunications ›› 2024, Vol. 47 ›› Issue (6): 99-104.

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OTSM Time-Frequency Synchronization Algorithm for LEO Satellite Communications

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  • Received:2024-03-28 Revised:2024-05-17 Online:2024-12-28 Published:2024-10-29

Abstract: In order to address with the complex channel environment in low earth orbit satellite communication networks and eliminate the interference caused by time offset and carrier frequency offset, a time-frequency synchronization algorithm oriented to orthogonal time sequence multiplexing (OTSM) modulation technology is proposed. The time synchronization algorithm based on two-dimensional search uses the periodicity of the pilot signal in the delay-time domain to search pilot sequence in the delay and time dimensions to estimate the time offset of the received signal. The frequency synchronization algorithm based on the two-dimensional correlation function estimates the carrier frequency offset of the received signal by calculating the phase of the two-dimensional correlation function value of the pilot sequence. The simulation results show that the proposed time-frequency synchronization algorithm achieves good bit error rate performance in the satellite-ground scenario.

Key words: low earth orbit satellite, orthogonal time sequence multiplexing, time synchronization; frequency synchronization, correlation function

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