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Newtec Clean Channel Technology y Nuevas Modulaciones
 

Newtec Clean Channel Technology y Nuevas Modulaciones

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PORTUGUESE: ...

PORTUGUESE:

O início desta apresentação contém uma breve introdução sobre a organização DVB e o processo de desenvolvimento de novos padrões. Posteriormente a apresentação elabora as sugestões Newtec para as extensões S2. Uma maior eficiência na transmissão via satélite pode ser obtida através da tecnologia Clean Channel Technology, esquemas de modulação mais eficientes, bem como uma maior granularidade em opções MODCOD .

SPANISH:

Esta presentación comienza con una breve introducción sobre la organización DVB y el proceso de elaboración de nuevas normas. Posteriormente, la presentación elabora las sugerencias de Newtec para las extensiones S2. Una mayor eficiencia en la transmisión por satélite se puede conseguir a través de la tecnología Clean Channel Technology, los esquemas de modulación más eficiente y una mayor granularidad en opciones MODCOD.

ENGLISH:

This presentation starts with a short introduction on the DVB organization and the process of developing new standards. Subsequently the presentation elaborates on the Newtec suggestions for the S2 extensions. Improved efficiency in satellite transmission can be obtained via Clean Channel Technology, more efficient modulation schemes as well as a higher granularity in MODCOD options.

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  • DSU: 30.000 Mbaud @ 20% = 36 MHz = 72.9 Mbps @ 8PSK 5/634.286 Mbaud @ 5% = 36 MHz = 83.3 Mbps @ 8PSK 5/6Assume available resources at satellite is 85 dB.HzFor 30.000 Mbaud C/N = 85 – 10 log(30.000E6) = 10.23 dB achievableFor 34.286 Mbaud C/N = 85 – 10 log(34.286E6) = 9.65 dB achievable Conclusion: in a full saturated transponder, the available power remains the same, so when symbolrate is increased, the power is spread over a larger bandwidth.This will effectively decrease the achievable C/N on the other hand, the throughput will increase.So for each case at hand the balance will need to be made.The same applies in multi-carrier operation. When a given bandwidth is leased, determined as the symbolrate multiplied with the channel spacing (which isn’t necessarily the same as the roll-off) , this corresponds to a given PEB used. In case the symbolrate is increased (by keeping the same leased bandwidth and reducing the symbolrate), more PEB will be used. This will work fine for links that were previously underusing the available power. For balanced links (power versus bandwidth), the cost for the link will increase because PEB is increased.