Optimal frame synchronization for DVB-S2

In this paper, we present an optimal frame synchronization scheme for DVB-S2 system. The scheme is based on differential detection and non-threshold peak search algorithm to achieve frame synchronization. By further analyzing the structure of the Physical Layer Header (PLHEADER) that consists of Start of Frame (SOF) and Physical Layer Signalling Code (PLSC), we find some useful properties that can enhance the frame synchronization and reduce the complexity of its implementation. We also introduce some optimizations into the algorithm. Especially, the modifications made on the peak search algorithm improve the overall performance of the frame synchronization. The experimental results show that the optimal frame synchronization can be achieved under large carrier frequency offset (as large as 5 MHz at 25 MSps) and low SNR threshold of - 2.3 dB. Compared with previously proposed approaches, the scheme described in this paper takes less time to acquire frame synchronization and seems to be more robust.