01 December 2015
The Pleiades project is based on 2 satellite communications modem physical layer development tracks, bringing new IP connectivity solutions to the corresponding 2 market segments:
1 A consumer oriented market on one side (addressed by Newtec’s Sat3Play™ solution, deployed in star VSAT networks).
The Sat3Play™ solution is DVB-S2 standard (ETSI EN 302 307) based for forward link and MF-TDMA (Multi Frequency-Time Division Multiple Access) based for the return link with 4CPM (Quaternary Continuous Phase Modulation) modulation.
MF-TDMA is excellent when considering statistical multiplexing and overbooking as typically seen in consumer broadband access applications, but the efficiency drops when considering less bursty traffic as, for instance, generated by small office business users.
Additionally 4CPM has a very poor air interface efficiency (bps/Hz) compared to higher order modulation schemes as used in DVB-S2.
As a goal of the project a complete new technology allowing the use of higher order modulation schemes similar to DVB-S2, but with a much lower packetisation latency and with the flexibility of MF-TDMA to optimise, on a frame per frame basis, the transmit parameters according to the requested traffic and the channel conditions, has been developed. As such the technology allows to adapt per user, on a frame per frame basis, the carrier frequency, the symbol rate, the used MODCOD (Modulation and Coding configuration) and the transmit power.
This return link technology will be marketed under the name Mx-DMA (Cross-Dimensional Multiple Access) HRC (High Resolution Coding).
2 High end professional markets on the other side (addressed by Newtec’s Elevation™ products, deployed in point to point networks).
The Elevation™ products are DVB-S2 based for both forward and return links.
The DVB-S2 standard was released in 2005 and introduced as one of the most advanced modulation and demodulation implementation at that time. The performance improvement compared to the previous DVB-S and DVB-DSNG standard was such that the market quickly and widely adopted the new specification for a number of services and applications.
Six years later, new proprietary implementations and technologies are being introduced on the market, competing with DVB-S2 systems and showing that further improvements in bandwidth efficiency are possible.
This part of the Pleiades project focuses on the development of DVB-S2 Physical layer improvements (new modulation schemes, new coding schemes) and their implementation on new hardware.
This improved DVB-S2 technology is marketed under the name S2 Extensions.
25 November 2015
The Satellite Procedure Execution Language and Library (SPELL, https://sourceforge.net/projects/spell-sat/), is a free, open source software package developed by SES in cooperation with GMV. The purpose of SPELL is to automate the execution of satellite procedures. SPELL works on multiple satellite platforms and can be interfaced to multiple Ground Control Systems (GCS). Thanks to this generality, SPELL increases the productivity of satellite controllers and engineers.
EASO (Efficient Automation of Satellite Operations) aims to develop both the satellite procedures and the automatic procedure converter software necessary to extend the use of SPELL to SES’ satellites fleet.