The objective of this activity is to investigate and design Ka-band multi-beam dual-polarization payloads for significantly higher capacity utilization with respect to conventional multi-beam payloads in the presence of unbalanced traffic demand.
In this respect, possible payload architectures and related technologies identifying key payload equipment for further development are to be defined, traded-off and assessed.
The activity covers the following aspects:
- analysis of requirements and architectural trade-offs;
- detailed design (including architectural and sub-systems design);
- analysis, simulation and optimization of performance;
- identification of required technology improvements and necessary developments;
- compare results in terms of capacity utilization improvement.
Ideally, to cope with peaks of capacity demand on hot spots (see Fig. 1) the payload should be flexible to the extent that the overall available user-link bandwidth in both the orthogonal polarizations (i.e. Dual-Polarization, DP) should be assignable to a limited number of beams, while maintaining the Single Polarization (SP) at user level on the remaining less-demanding beams.
In contrast to past and on-going activities at ESA, the aim of the present study is to explore the possibility of using dual-polarization for the hot spots, with flexibility to adapt to the traffic demand evolution.
The activity indeed targets a capacity utilization improvement of 40% with respect to conventional multi-beam payloads.
The outcomes of the activity are the detailed design of the payload architectures, including payload block diagrams, mass/power/dissipation budgets, delta cost estimation and a hardware matrix, and high level specifications for the identified new payload equipment.