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This project demonstrates the feasibility (both technical and business) of a software-defined gateway/teleport implementation scalable to support handling of 5 GHz instantaneous RF bandwidth based on cloud technology and generic processing hardware. The enabling core technology module is the efficient implementation of DVB-S2/S2X software modulation and demodulation based on x86 CPU, without reliance on FPGA or GPU resources. The project demonstrates the implementation of a symmetric duplex 250 MHz RF bandwidth in each direction. The forward link is a single 250 MHz DVB-S2X, while the return link capacity of 250 MHz is divided across DVB-RCS2 TDMA channels and DVB-S2/S2X SCPC channels. The SCPC channels are dynamically allocated with seamless reconfiguration maintaining IP traffic flow without loss in the transition between changing transmission plans.
The key challenges in this project are:
Emerging satellite payloads will require flexible ground structure. The current analogue L-band distribution technology will be replaced by the distribution of digitized RF streams over standards-based Ethernet links. Software defined modulation and demodulation enables cloud implementations of ground segment processing.
By avoiding custom hardware, gateways and ground stations can be architected purely with generic digitizers and generic computing hardware, where all application specific functionality resides in Virtual Network Functions executed in containers in the generic cloud hardware.
The Wideband Software defined Hub is a demonstrator of how a software-defined satellite gateway/teleport would operate:
The System architecture is shown in the Figure. All software-defined satellite gateway/teleport and terminal functions are implemented in cloud compatible modules and executed on Virtual Machines in containers. The architecture therefore allows scaling to support a large RF segment (5 GHz).
The RF output is generated by a digitizer from the software modulator providing an I&Q stream output. The receiver chain has a digitizer that digitizes the received RF stream as I&Q samples before the I&Q stream is passed to general processing hardware where the demodulation and decoding is performed in cloud compatible environment.
March 2020: Kick-Off
May 2020: System Requirements Review
Aug 2020: Critical Design Review
April 2021: Test Readiness Review
June 2021: Factory Acceptance Test Review
Sept 2021: Site Acceptance Test Review
Oct 2021: Final Presentation
The project kicked-off on March 2nd 2020.