Novel sampling clock offset estimation for DVB-T OFDM

Sampling clock offset estimation and compensation are important problems in an OFDM system. Sampling clock offset can cause a severe drift in symbol-timing, thus causing intercarrier and inter-OFDM-symbol interference. In this paper, we propose a novel sampling clock offset estimator for OFDM systems that use scattered pilots. The proposed algorithm makes use of the received pilot phases and the least-squares algorithms. Simulation results show that when applied to the DFB-T standard, the performance of the proposed estimator is very accurate and robust against multipath fading and Doppler spread.