DVB–S2X Demonstrated over HTS

by Patrick Gannon

Oct 30, 2017

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Advantech Wireless has announced a successful demonstration using DVB-S2X , running on its ASAT-II Hub and Terminal system, over Intelsat’s 29e EpicNG High Throughput Satellite (HTS) spot beam covering Santiago, Chile in the southern hemisphere.

The DVB Project standardized DVB-S2X as a digital satellite broadcast standard, as an optional extension to the DVB-S2 standard. It boasts efficiency gains of up to 51% by supporting higher modulation schemes (64/128/256APSK), smaller roll off factors, and smaller carrier spacing due to improved filtering.

When a signal is transmitted to a satellite, it passes through a filter in order to avoid interference with signals in nearby channels, and to restrict transmissions outside the bandwidth in which the service provider is permitted to transmit. The “roll off factor” is what determines how abruptly or gradually the signal being transmitted drops off, after being filtered. A high roll off factor means a more gradual drop off.

When VSAT hardware offers roll off factors in the range of a typical 20 – 35%, for example, it means that the service provider’s leased channel must be 20% larger than the signal they actually want to transmit. The provider is paying for capacity – the amount of roll off – that is not being used to transmit traffic. Reducing the roll off means less overhead, so one can transmit more Mbps over the same amount of bandwidth, or buy less bandwidth, and reduce costs.

The ASAT II system demonstrated by Advantech Wireless, utilizing a high modulation and coding (modcod) rate (32APSK, ¾) with a 5% roll off, delivered the highest bandwidth efficiency demonstrated over Intelsat’s 29e spot beams thus far. Reducing the roll off to 5%, by utilizing the latest DVB-S2X standard, resulted in outstanding performance gains over the typical 20% roll off, of the earlier standard. Those in attendance at the demonstration for national TV broadcaster TVN were impressed with the results and well satisfied with Advantech Wireless’ ASAT-II platform.

The ASAT-II platform boasts Advantech Wireless’ 3-Dimensional Bandwidth-on-Demand Scheduling and Bandwidth Allocation System (3D-BoDTM). They claim that the novel service model architecture achieves high application performance by dynamically optimizing waveform assignments, all while using minimum satellite bandwidth resources. The idea is to utilize best bandwidth management techniques to support multiservice and any number of various Service Level Agreements (SLA). The demonstration was performed using the ASAT-II Hub and E7000 DVB-S2X terminal. In addition to measuring performance, the ease of switching between SCPC and MF-TDMA modes, was also demonstrated.

As the Advantech Wireless demonstration confirms, the efficiency of VSAT platform systems continues to improve, as do the satellite systems over which they operate and deliver services. Intelsat S.A. launched the first of their EpicNG high throughput satellites on January 27, 2016, from French Guiana aboard an Arian 5 spacecraft. Intelsat 29e brings high throughput capacity in both C-band and Ku-band to North America, Latin America and the North Atlantic region. The satellite is the first of Intelsat’s next generation satellite platform combining wide beams and spot beams, leveraging frequency reuse technology, along with their most advanced digital payload. Intended to support a wide range of applications from fixed and mobile services for network operators, broadband for enterprises, the Internet of Things (IoT), and maritime and aeronautical services, the EpicNG satellite platform was well prepared to support the new DVB-S2X standard, as demonstrated by Advantech Wireless. Our industry continues to innovate and explore better solutions, all leading to a more connected world.

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