World’s Fastest Transmission Technology

World’s Fastest Transmission Technology

April 2012

What started out as a simple test of a number of Newtec’s recently released and upcoming technologies ended with quite an exceptional outcome. During the actual test an Intelsat 72 MHz Ku band transponder was saturated using Newtec’s latest technology and a mere 4.5 meter  antenna.

The result using a combination of Wideband, smaller carrier spacing with Clean Channel Technology™ (CCT) and carrier pre-distortion with Equalink® (Newtec technologies) was a staggering 313 Mbps. Amazingly that it did not include the use of the upcoming modulation and coding DVB-S2 extensions that Newtec’s 200-strong engineering team is working on.

When adding a return carrier within the same transponder  and Newtec’s 2nd generation Bandwidth Canceller, 372 Mbps was reached, by far exceeding current market available alternatives within the same link conditions.

In a recent interview with Serge Van Herck and Dirk Breynaert, Newtec’s CEO and CTO, they said that customers can already today take full benefit of those technologies with the exception of the wideband modem technology. The latter will become commercially available later this year. The technologies used in the test and the upcoming technologies will be made available to major operators and service providers for testing prior to their commercial release. Newtec is looking forward to sharing this experience and collecting feedback from the industry. It’s Newtec’s intent to productize the most efficient modulation and demodulation algorithms  and to help standardization bodies with defining and bringing new standards to the market.

Smaller carrier spacing with Clean Channel Technology

Central to this success was Newtec’s Clean Channel Technology, which is a combination of improved roll-offs for DVB-S2 and  advanced filtering technologies to allow optimal carrier spacing. One of the advantages of using Clean Channel Technology is that the combination brings efficiency gains of up to 15%. Furthermore, not only can the technology be used as an upgrade to current Newtec equipment it is also compatible with new equipment.

What does this technology do to your carriers?

1) A first step with Clean Channel Technology is applying a smaller Roll-Off (RO) percentage than currently used in the DVB-S2 standard. In the DVB-S2 standard the 20% and 25% Roll-Off percentages are common. Which basically means that these percentages need to be added to the desired bandwidth over satellite. Reducing these Roll-Offs to 5%, 10% and 15% results in a direct gain in bandwidth. Looking at the spectral image when implementing smaller Roll-Offs the slope of the carrier becomes steeper compared to DVB-S2 but still fits nicely in the allocated bandwidth.

2) The second step deals with noise levels (side lobes) on both sides of the carrier. These side lobes prevent putting satellite carriers close to each other. Applying advanced filter solutions such as in Clean Channel Technology have immediate effect on bandwidth savings as the spacing between carriers can be put as close as 1.05 times their symbol rates.

The technology can be applied in satellite links with single carriers, multiple carriers or carriers sharing the same transponder with other providers. In the latter case, carriers with Clean Channel Technology can easily co-exist with carriers from other operators within the same carrier. Clean Channel Technology is only applied on the allocated carriers. Neighbouring carriers will not be affected and do not feel any form of interference. Clean Channel Technology is available on Newtec’s professional equipment. Both as a software field upgrade for installed equipment as well as new equipment.

“Intelsat has integrated Newtec’s high speed modems in its new IntelsatONE infrastructure connecting three continents” (Thierry Guillemin, Senior VP & CTO, Intelsat).