六合彩大全|六合彩新图108期

DVB-S2 Technology

The DVB-S2 standard (EN 302 307) defines the second-generation modulation and channel coding system for satellite TV to make use of the improvements that have emerged since the publication of the DVB-S standard. DVB-S2 is a single, very flexible standard covering a variety of applications by satellite.

DVB-S2 is the next logical step in the continuous development of DVB-S. Innovative and more efficient channel coding methods combined with higher-order modulation modes enable operators to transmit up to 30 % more data when using DVB-S2 as compared to DVB-S at the same transponder bandwidth and EIRP.

The system has been optimized for digital multiprogram television broadcasting services and high definition television (HDTV) broadcasting services to be used for primary and secondary distribution in the fixed satellite service (FSS) and the broadcasting satellite service (BSS) bands.

It features the following:

  • A flexible input stream adapter, suitable for operation with single and multiple input streams of various formats (packetized or continuous)
  • A powerful FEC system based on low-density parity check (LDPC) codes concatenated with BCH codes, allowing quasi-error-free operation at approx. 0.7 dB to 1 dB from the Shannon limit, depending on the transmission mode
  • A wide range of code rates from 1/4 up to 9/10
  • Four constellations (QPSK, 8PSK, 16APSK, 32APSK), ranging in spectrum efficiency from 2 bit/s/Hz to 5 bit/s/Hz, optimized for operation over non-linear transponders
  • A set of three spectrum shapes with roll-off factors of 0.35, 0.25 and 0.20
  • Variable coding and modulation (VCM) may be applied in order to provide different levels of error protection to different service components (e.g. SDTV and HDTV, audio, multimedia)
  • In the case of interactive and point-to-point applications, the VCM functionality may be combined with the use of return channels to achieve adaptive coding and modulation (ACM). This methods provides the best-suited channel protection and dynamic link adaptation to propagation conditions, targeting each individual receiving terminal
International Website
六合彩大全
浙江快乐12选5预测软件下载 多乐快3技巧 北京赛车技巧新手篇 内蒙古快三走势图爱彩乐 二肖中特如何买 福彩助手软件 辽宁11选5哪里查 奇人透码精准铁杀10码 上海时时乐开奖记录 三肖中特公式规律 新疆十一选五任五推存 极速快3哪里下载迅雷下载 七乐彩12046期预测 排列五走势图近100期 四不像奇人透码资料图