Due to its good scalability, each part includes many more options, adaptations and other units, far more complex than DVB-S.
Mode Adaption is an input data stream interface that is used to adapt to DVB-S2's wide variety of input stream formats. For the fixed coded modulation mode, the mode adaptation part includes transparent unwrapping of the DVB-ASI stream (or DVB parallel transport stream) and 8-bit cyclic redundancy check.
Stream adaptation completes the two functions of baseband framing and scrambling. In order to cooperate with subsequent error correction coding, baseband framing requires that the input data be packed with a fixed length (different error correction coding schemes have different "fixed lengths"), and insufficiency is filled with useless bytes.
Forward error correction uses a cascade of LDPC and BCH.
The mapping section converts the input forward error correction serial code stream into a parallel code stream that satisfies a specific constellation pattern according to a specific modulation method (QPSK, 8PSK, 16APSK, 32APSK) used later.
The framing section of the physical layer implements energy diffusion through scrambling, as well as the insertion of empty frames.
The modulation section completes the baseband shaping and modulation.
And now DVB-S2 is compatible with Android OS, more powerful...