Efficient Receiver for DVB-RCS2 Synchronization Problems

The second generation digital television broadcasting interactive satellite system (DVB-RCS2) plays a very important role in the interactive satellite communication system. It is a burst communication system and works under multifrequency time division multiple access (MF-TDMA). In practical applications, serious synchronization problems will be encountered, especially the system adopts the Turbo coding method, which is very sensitive to the carrier frequency offset. Therefore, we propose a solution for DVB-RCS2 synchronization problem. Combined with previous research on synchronization problems, timing synchronization is combined with oversampling and correlation with known sequences to locate the burst position. In terms of carrier frequency offset, for the special burst format such as preamble and postamble in DVB-RCS2, the phase difference is used to estimate the frequency offset, and the cyclic redundancy check (CRC) information in the burst is used as the check of the frequency offset estimate. The synchronization module we designed can correct the time offset and carrier frequency offset generated during the transmission of all waveforms in DVB-RCS2, and also has good performance under low signal-to-noise ratio.