The project tackled a two-way broadband satellite communications system with a conventional multi-star topology between the GWs in the feeder link and the user terminals in the user link.
Four different system scenarios were considered:
1) A transparent satellite with 200 user beams operating at the Ka-band and with 13 Q/V-band feeder beams (Scenario 1 baseline);
2) A transparent satellite operating at a larger frequency plan with respect to scenario 1 with 200 user beams at Ka-band and 25 Q/V-band feeder beams (Scenario 2);
3) A regenerative satellite operating at optical frequencies in the feeder link and on Ka-band in the user link (Scenario 3);
4) A cluster of 2 transparent satellites on different sub-satellite points each with 100 Ka user beams and 7 Q/V feeder beams (Scenario 4).
For each scenario, the ability of ground segment’s system techniques to mitigate the effect of all identified criticalities was studied. More specifically, among a list of many techniques, interference and fade mitigation techniques including Smart Gateway Diversity was evaluated both for the Return Links, handover mechanisms were proposed.
Aspects relevant to Ultra High Throughput Networks related to Physical Layer, MAC Layer and Radio Resource Management will be also analysed with an emphasis given among others on improvements on DVB-S2 and DVB-RCS2, interference mitigation and cancellation, multi-channel receivers and channel dependant scheduling techniques.