DVB satellite 2 (DVB-S2)
With DVB-S2, a more powerful satellite variant of DVB-S with a higher data rate was standardized in 2005. For this purpose, DVB-S2 uses phase shift keying(8PSK) instead ofquadrature phase shift keying ( QPSK) and asymmetric phase shift keying 16- APSK or 32-APSK.
Which of the optionally available modulation methods is used depends on the transmission quality, which is determined at the receiving end by means of Adaptive Coding and Modulation( ACM) and transmitted to the transponder as feedback.
The increased data rate is due not least to the more efficient error correction of the Low Density Parity Check( LDPC). DVB-S2 also uses more efficient and higher compression video codecs such as H.264/ AVC or WindowsMediaVideo(WMV) .
In terms of transmission, DVB-S2 uses the same reception equipment as DVB-S, i.e. the same parabolic antenna and the same LNB converter, but the receiver differs from that of DVB-S because it must be equipped with a different demodulation and decompression, namely H.264/AVC.
DVB-S2 is suitable for satellite radio, interactive services, messagingand other broadband services. DVB-S2Y, an improved version of DVB-S2 with higher availability, was introduced in 2014.