"A Tale of Return Technologies" is published in 3 parts. This is [Part 1]. You can get an overview and background information by reading published intro article: "A Tale of 3 Return Technologies in 3 Parts".
Matching Satcom Return Technologies and Applications on Newtec Dialog
By Koen Willems, Market Director at Newtec
Satellite service providers continuously seek new ways to improve the efficiency of their satellite networks in order to counter high bandwidth costs, increase profitability or to push more content over satellite. Not only is the efficiency of the forward link important, but also the return path (from the remote site back to the hub).
Three modes of return technology are available to the satellite service provider on the Newtec Dialog platform to configure its network: MF‑TDMA, SCPC and the new patented Newtec Mx-DMA™ (Cross-Dimensional Multiple Access).
The modems and the hubs on the Dialog Platform support different satellite return technologies in order to support different applications, services and traffic types:
- MF-TDMA return technologies typically target applications with bursty (and thus highly overbooked) traffic services such as Internet access for consumers and private SME, B2B and SCADA networks.
- SCPC on the other hand has more applicability in high data and video rate return links.
In between there are a large number of applications with low to medium overbooked services and throughput rates of up to 20+ Mbps (See Figure 1). These applications are enterprise/corporate networks, government/NGO networks, cellular backhauling and broadcast contribution networks.
A large part of the market is caught with the SCPC versus MF-TDMA dilemma. And the end-user? He does not really care as long as he gets the right service level for the right price. Some technologies in the market already allow a (semi-) dynamic switch between SCPC and MF‑TDMA, but that goes hand in hand with a considerable satellite outage time, packet loss and sub-optimal usage of the link.
Figure 1: Overview return technologies, throughput rates, overbooking ratio and matching applications and Newtec products
Newtec Mx-DMA to the Rescue
Today, Newtec introduces a new return link technology that will rock the satellite market: Mx-DMA or Cross-Dimensional Multiple Access. Mx-DMA combines the best qualities of SCPC and MF-TDMA technologies and solves the difficult choice of having to select either of them.
In other words, on one hand the new satellite return technology will provide MF-TDMA-like on-demand variable bandwidth allocation. On the other hand, Mx-DMA uses Newtec HighResCoding™ (HRC) coding and modulation, which results in SCPC-like efficiencies (from Q‑PSK up‑to 32APSK) using 40 distinct MODCODs.
Both technologies combined also ensure:
- low jitter/delay and
- excellent packet-error-rate performance,
making Mx-DMA well suited for voice and video streaming applications.
Where Are the Main Gains in Newtec Mx-DMA coming from?
Figure 2: Comparison efficiency of three optional return link technologies (MF-TDMA, SCPC and Mx-DMA)
The main gains in Newtec Mx-DMA are coming from the following considerations when Newtec created the new return technology:
- The chart in Figure 2 clearly indicates that the spectral efficiency of Mx-DMA HRC (orange line) is much higher than the MF-TDMA return technology (green line) which always suffers from synchronization overhead and burst guard times.
- Within the Mx-DMA return link each carrier is assigned to only one terminal. As such SCPC-like return efficiencies can easily be achieved.
- At the same time the flexibility of MF-TDMA can be maintained. It remains possible in Mx-DMA to allocate bandwidth on-demand and in real-time.
- Mx-DMA fully supports statistical multiplexing ‘in the sky’ over the aggregated capacity whilst still respecting SLA agreements.
So how does the Newtec Mx-DMA return technology actually work? Mx-DMA adjusts the frequency plan, the symbol rate, the modulation, coding and power in real time of each and every carrier in the satellite network. These adjustments are based on the following parameters:
- Return traffic demand,
- Network QoS management, and
- Channel conditions for the terminal population in the network.
With this information in the back pocket we are ready to jump to the two use cases where we will compare the return Mx-DMA technology gains against SCPC and MF-TDMA. So tune in for the next episode of this blog post and keep a watchful eye on the Newtec website or social media.
Here you find an overview of all 3 parts .
Market Director at Newtec