A novel synchronization scheme for OFDM-based CMMB receivers

A novel synchronization scheme aiming at the special frame structure of China mobile multimedia broadcasting (CMMB) is presented in this paper. Based on the fact that CMMB system is very sensitive to the synchronization error, this scheme gives a solution which integrates high precision symbol timing recovery, carrier frequency recovery and sampling clock frequency recovery. Simulation results show that proposed algorithm can perform robustly at -2 dB SNR and TU6 channel with 300Hz Doppler frequency shift. The root mean square error (RMSE) of sampling clock frequency offset estimation and residual carrier frequency offset estimation is 50% less than that of conventional scheme.