OTSM Time-Frequency Synchronization Algorithm for Low Earth Orbit Satellite Communications
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 achievesgoodbit error rate performance in the satellite-ground scenario.
low earth orbit satelliteorthogonal time sequence multiplexingtime synchronizationfrequency synchronizationcorrelation function
NETL
NSTL
万方数据
