DEDICATION

Objectives

Space Engineering (SE) is strongly motivated to develop ground-segment products compliant with the new DVB-S2 standard.

To achieve this objective, SE has conceived the DEDICATION project with the aim to perform critical developments that will have a clear commercial finalization.

The targeted markets are expected to develop in two contexts:

• KabSat, the Ka-band satellite system which is being devised with the main objective to serve the Italian Public Administration telecommunications needs, and which will operate on the DVB-S2 standard,
• Satellite systems in general, which operate on DVB-S2 either in the broadcast or the unicast mode.

To test the critical developments envisaged above, the DEDICATION project aims to develop DVB-S2-Test Bed (DTB), a comprehensive laboratory facility within which the key DEDICATION Products are fitted.
DTB creates a realistic environment in which to thoroughly validate those Products.

Challenges

The DEDICATION project is intended to perform:

• Assessment of DVB-S2 system architecture and layers,
• Development of critical DVB-S2 items with a clear commercial finalization,
• Development of a DVB-S2-Test Bed (DTB) to have a realistic test environment,
• Campaign of system-level validation tests.

Plan

The DEDICATION project includes five Technical Tasks and a Management Task:

• First technical Task aims to reassess the requirements and to consolidate the system specifications, with the support of analyses and simulations,
• Intermediate technical tasks concern the equipment development: the first one cares for the architectural design, the second one for the detailed design, implementation and stand-alone verification testing, finally the third one with hardware integration and conformance testing,
• Last technical Task is dedicated to the system-level validation and the interoperability tests.

Tasks are subdivided into a total of 39 Work Packages. WP responsibility is assigned to 11 highly qualified Key Persons. The project duration is 18 months and is organized as follows:

• An initial four-month period in which the theoretical and computer simulation activities are carried out, with the aim to identify the best algorithms and implementation solutions, and hence consolidate the specifications,
• A twelve-month period covering the design, implementation, integration, and functional verification of the specified equipment,
• A final two-month period for the system validation and interoperability tests.

Current Status

The initial activity of review and analysis of system requirements is concluded with the Baseline Design Review. On BDR latest results are provided about the DVB-S2 modem/codec performances.

The activity to implement a detailed SW simulator of the demonstrator based on the Generic Stream is completed in Phase 1. The IDR concluding the Phase 1 was held on October 2006.

The Phase 2 started in January 2007 with a revision of the GS architecture aiming at improving the system throughput efficiency and with the acquisition and evaluation of the commercial hardware to implement the upper layer functions.

In September 2007 the Upper Layers elements were implemented and the individual stand-alone testing was started.

In May 2008 the physical Layers elements were characterized by SW simulations and their implementation in HW was completed up to a level allowing pre-integration with Upper Layer for at least 5 out of the 8 MODCOD supported by the current implementation. All the final ancillary HW design activities aiming to provide the Dedication DVB-S2 station in a single 19” Rack i.e. back-plane, clock generation and distribution were completed and their manufacturing is on going.

The Upper Layers integration activity is completed (the Physical Layer replaced by a stub) with the verification of the performance at fixed modcod and with the ACM control to change dynamically the modcod.

Ping request (ICMP)and video streaming (UDP) are used to generate the wanted traffic during the ULs integration.

In December 2008 the activity was completed with the successful experimentation of real Internet services (video streaming, web browsing) in a comprehensive channel and traffic environment including three IP networks: DTB, INTRANET, INTERNET.

The system can be analogously made available via internet to external users in order to make experiments on other services and configurations of interests

The DTB system allowed the development ad the verification on realistic environment of some standard blocks of the of PL and MAC layer, such as:

• DVB-S2 modulator and encoder
• DVB-S2 demodulator and decoder
• GSE encapsulator and scheduler
• GSE decapsulator

These functionalities have been implemented in medium performance FPGAs and they are ready to be implemented in latest technology FPGAs and in ASICs.