Frequency Synchronization in Satellite Single Frequency Network of China Mobile Multimedia Broadcasting System
This paper present a frequency synchronization method for satellite single frequency network of CMMB(China Mobile Multimedia Broadcasting) system.It uses the time-domain correlation of synchronization sequences to estimate the initial frequency offset,and uses the frequency-domain correlation of continuous pilots to track the residual frequency offset.The frequency of satellite downlink signal is locked to the reference frequency by closed-loop control,thus the frequency synchronization of network is realized.Simulation results show that the method has high accuracy and robustness.