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In the frame of this study, some key technologies for on-ground processing techniques to minimize non-linear effects in multi-carrier operation mode are investigated. Pre-distortion and equalization algorithms have been analysed and evaluated by software simulations. The end-to-end system simulation have been performed with a DVB-S2 system and representative channel impairments caused by IMUX, OMUX and HPAs.
Within this study, different techniques for on-ground pre-distortion and equalization, including fractionally spaced equalization has been surveyed and the performance gain was analysed. The techniques have been benchmarked using different mission scenarios for single and multi-carrier broadcasting. The scenarios included present state and predicted future demands of the end-to-end system requirements for increased data rates and bandwidth.
Figure: Distortion of a 32APSK modulated carrier (exemplary)
Figure: Simulation chain with models (exemplary)
The final review of the last work package was held on March 18, 2014 at ESA/ESTEC. The project will be closed with the delivery of the final documentation.