Robust Timing and Frequency Synchronization Scheme for DTMB System

In this paper a robust timing and frequency synchronization algorithm for DTMB system is developed. A two-step frequency offset estimation and compensation process is proposed to perform carrier recovery. Firstly coarse frequency estimation is achieved by utilizing the shift-and-add property of m-sequence. The second step finds the frame start position and the remaining frequency offset simultaneously. Meanwhile a timing tracking strategy is proposed to effectively track the dynamic changes in mobile environment. Thus the proposed scheme can resist large frequency offset and achieve accurate timing and frequency estimation. Simulation results under different channel situations verify the performance of the proposed scheme.