PCI DVB-S2 receiver second-generation Digital HDTV 1080I

DVB-S2, with its higher bandwidth efficiency, more advanced coding methods and near the Shannon limit system performance attracted wide attention. It should be noted that, DVB-S2 efficient transmission of the available satellite transponder power and linear level also has set higher requirements. High-power satellites in Asia and linear features such as better advantage, can adapt to the DVB-S2 standard for the requirements of transmission channel, especially one of high modulation scheme on the application of the satellite channels.
Outlined the characteristics of DVB-S2

DVB-S compared with, DVB-S2 can provide a variety of things in addition to QPSK with higher bandwidth efficiency of modulation methods, such as 8PSK, 16APSK, 32APSK. And DVB-DSNG of 16QAM compared, DVB-S2 the 16APSK and 32APSK modulation technique to reduce the rate of change, can adapt to the relatively poor linear characteristics of the satellite transmission channel, so that a high modulation transfer become possible through satellite channels.

With DVB-S and DVB-DSNG comparison, DVB-S2 uses a more powerful forward error correction system, the BCH and LDPC (LDPC) code concatenated channel encoding, effectively reduces the system demodulation threshold, distance theory Shannon limit is only 0.7 ~ 1dB gap.

DVB-S2 spectrum shape of Raised Cosine roll-off coefficient