Dvb-s2 Modem

[David]

Ourmodems incorporate complex (turbo/LDPC-based codes, higher order modulation, and high-speed) digital modems with implementation loss from theory around 0.5 dB. The DVB-S2 modem operates within 0.35 dB of theory with a QPSK rate 1/2 code running at 50 Msym/ sec.

We have also developed several distinct modems or modem subsystems exceeding data rates of 300 Mbps using turbo/LDPC-based FEC, as well as modems optimized for low size, weight, and power (SWaP) applications.

The Viasat highly integrated bandwidth-efficient advanced modulation (HI-BEAM) two-way modem is designed to provide high-speed, standards-based communication in a low SWaP environmentally-sealed package. Rigorously designed to work on ground vehicles, littoral buoys, fixed masts and towers, the HI-BEAM also operates on fixed-wing propeller aircraft and helicopters.

Dears Peplink,

I have satellite internet in my company DVBS2 Modem download link IP: 172.16.16.2

and SCPC upload link through Comtech Satellite Modem IP: 172.16.16.1

now I connect both ether cables of download and upload links to a HUB SWITCH, and get ether cable from same switch to port WAN1 on my Peplink 710

and I configured WAN1 as following:

Satellite internet works in the same manner as satellite TV. The concept of geosynchronous orbiting of satellites is central to the operation of satellite internet. Simply, this means that the satellite must be placed in an orbit above the equator at a distance of about 22,300 miles. At this location, the satellite will orbit at the same pace as the earth rotates. This enables your home satellite dish to constantly remain in contact with the orbiting satellite. This is also why (if you live in the northern hemisphere), you must have an unobstructed southward view of the sky from where you place your home satellite dish. The complete satellite internet system includes the following:

Single Channel per Carrier (SCPC) transmission is the preferred choice for Quality of Service (QoS) sensitive application to enable Voice-over-IP (VoIP) and other delay critical applications. (just one modem will use to receive internet) used as any internet modem plug and play.

Highly effective, the flexible and low-cost SCPC/DVB-S2 delivers Internet access over DVB-S2 standard platform. This solution consists of three main components: Forward Link Subsystem, Return Link Subsystem, and auxiliary added value capabilities.

The MDM6000 Satellite Modem is a versatile high performance modem which allows service providers and government operations to increase the amount of services or the customer base within the same bandwidth. At the same time it introduces ways to reduce OPEX costs and increase the profitability of their business at maximum efficiency and optimum availability.

The MDM6000 modem is typically installed at both ends of a point-to-point satellite link or at the remote sites of a star network. The unit can work as a modulator, demodulator or modem depending on the network configuration and integrates seamlessly with terrestrial IP networks and equipment. The modem is in full compliance with the DVB-S2 and DVB-S2X standards to achieve barrier-breaking efficiency at maximum service availability.

In applications demanding higher speeds and packets-per-seconds processing than those offered by the stand-alone MDM6000, the MDM6000 High Speed solution can be used. It adds an external packet processor that handles shaping, bandwidth management and encapsulation to achieve up to 850 Mbps and 800 kpps duplex.

ST Engineering iDirect, Inc. dba iDirect is a global leader in IP-based satellite communications, providing technology and solutions that enable our partners to deploy advanced satellite services that profitably expand their businesses.

The MDM9000 modem is typically installed at both ends of a point-to-point satellite link or at the remote sites of a star network. The unit can act as a modulator, demodulator or modem depending on the network configuration and integrates seamlessly with terrestrial networks and equipment. The modem is in full compliance with the DVB-S2 and the recently released DVB-S2X standards while being backward compatible with S2 Extensions mode, all in order to achieve barrier-breaking efficiency at maximum service availability. In receiver mode, the MDM9000 serves as demodulator with dedicated intelligence gathering features.

Blink AMI is the ideal choice for satellite operators interested in using the AWS GS virtualized ground segment. Operators can send and receive DVB-S2/S2X and CCSDS signals from Earth observation satellites in real time, narrow- or wide-band, producing clean payload and cutting-edge reports.

Amphinicy Technologies has developed Blink Modem to enable anyone interested in Earth observation and space science to receive satellite payload data in real time - reliably, efficiently and conveniently. Blink AMI is a distribution of Blink Modem which allows operators convenient use with AWS GS. They can start and stop modem instances and other related infrastructure, minimizing cost and maximizing scalability.

Blink is a real-time, high data rate, software-based satellite modem designed to run on standard servers. It moves digital signal processing from high-maintenance hardware to software. It can run on bare metal (e.g., a standard server or laptop) or virtual/cloud environments. Blink can bring previously impossible missions to life and make missions generally easier to manage, more productive and cheaper to set up and evolve.

The default Blink AMI configuration provides support for the Suomi NPP mission. For configuring the modem for any other mission, please contact blink-...@amphinicy.com.

Licensing for Blink AMI may be obtained at competitive prices via a private offer. For more information, please contact awsmark...@amphinicy.com.

General support of CCSDS and DVB-S2/S2X protocols (including CCSDS over DVB-S2) and DVB-S2/S2X variable and adaptive coding and modulation (VCM, ACM) is available, along with DVB-S2/DVB-S2X uplink in CCM mode. For more details, please contact blink-...@amphinicy.com.

Important note: The customer is responsible for determining if the product ordered suits their needs.

The Q-Flex modem is a flexible software-defined modem that does what you want, now and in the future. Any waveform, any interface, IF and L-band, and data rates to 345Mbps. Plus fully-featured embedded IP (acceleration, compression, bridging, routing, encryption, shaping, ACM, etc.). And comprehensive diagnostic tools (including Rx spectrum monitor, Rx constellation monitor, interference detection underneath carrier, BER tester, etc.). Highly competitive pricing is achieved by enabling only the features you need at any time. Future-proofing is assured by convenient software upgrades via Ethernet or a memory stick and lots of processing headroom, protecting your investment.

The unique and flexible QubeFlex Satellite Transceiver/Modem comes with a suite of functionality aimed specifically at the smallsat market, including CCSDS telemetry standard compliance, supporting CubeSat satellite link communications at up to 50Mbps. Features include forward error correction, interleaving and scrambling using a variety of standardised CCSDS FEC schemes.

A single SigMF recording with a DVB-S2 signal sampled at 2 Msps at a carrier frequency of 11.723 GHz was given for the 10 flags of the track. The description and frequency were just some irrelevant fake backstory to introduce the challenge, although some people tried to look online for transponders on Astra satellites at this frequency.

The downside of GSE compared to MPE is that it is not supported by so many devices. Since MPE uses TS packets, it should be supported by mostly any device. The formatting of the TS packets, and thus all of the MPE stack, is handled at the application level. However, GSE is different from a stream of TS packets already the level of BBFRAMEs, so devices that handle this layer need to support GSE.

The MiniTiouner is a DVB-S2 hardware receiver that is based on a Serit FTS4334 NIM (which uses the STV0910 DVB-S2 demodulator IC) together with a FT2232H that provides a USB2 interface for data and control. It is a very popular device within the Amateur TV community, given its affordable price and large range of supported carrier frequencies, symbol rates, and MODCODs.

The ideas in this post are also applicable to an SDR demodulation approach, which could use gr-dvbs2rx and gr-dvbgse. Using a hardware receiver solution can give some benefits over an SDR receiver, since demodulation and LDPC decoding is computationally expensive, specially at higher symbol rates and in low SNR conditions.

My final goal for this is to do some tests of two-way IP links over the QO-100 WB transponder. I think this would be a rather interesting use of the transponder, since it would open the door to many new ideas. Currently the transponder is used almost exclusively to transmit video, which by all means is good, but not very innovative after the almost 4 years now that the transponder has been in operation.

I have to give huge thanks to Brian Jordan G4EWJ and Evariste Courjard F5OEO for their interest in this project and for running many initial tests that showed that it is possible to use the MiniTiouner to receive GSE (despite the lack of clear and detailed documentation about the STV0910 register settings).

A couple months ago I presented my work-in-progress design for a data modem intended to be used through the QO-100 NB transponder. The main design goal for this modem is to give the maximum data rate possible in a 2.7 kHz channel at 50 dBHz CN0. For the physical layer I settled on an RRC-filtered single-carrier modulation with 32APSK data symbols and an interleaved BPSK pilot sequence for synchronization. Simulation and over-the-air tests of this modulation showed good performance. The next step was designing an appropriate FEC.

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