Programme Element: ARTES 5.1
Reference nr.: 13.1TT.08
Planned Tender Issue: quarter 4, 2013
(*) Priority 2
Objective: Prototyping and testing of advanced compensation techniques to minimise non-linear effects in satellite systems employing multi-carrier per HPA transparent payloads.
The validation is intended either via real satellite transponder capacity or via realistic satellite channel emulation.
Targeted Improvements: Testing in real end-to-end satellite communication links of the effectiveness of advanced pre-distortion techniques (at the gateway) and equalisation solutions (at the user terminal) to improve the system performance in multi-carrier per HPA transparent payload (preliminary results show a possible reduction of the required OBO in excess of 1 dB).
Very often, due to power/mass and flexibility requirements, transparent satellite payload are operating in a multi-carrier per satellite HPA mode. Nowadays, in this configuration and due to the inter-modulation products generated by the non-linear blocks, a large guard-band between the carriers is needed in order to avoid ACI destructive effects and large back-off is necessary for the high PAPR of the multi-carrier signal. This translates in non spectrum-efficient frequency carrier segregation and power loss compared to single carrier operations depending on the spectral efficiencies of the individual carriers. In 2012, the ESA contract ?On-ground multicarrier digital equalization/pre-distortion techniques for single or multi gateway applications? is started. This activity is aimed at the identification and software validation of advanced solutions for such satellite communication environment.
The proposed activity shall start from the outcomes of this previous research project (TRL-1) and shall implement such novel solutions in a modem prototype. The activity shall develop the testbed including: a) the generation of a multi-carrier DVB-S2 streams along with the proposed pre-distortion techniques; b) satellite transponder capacity for live testing or, as an option, a realistic channel satellite emulator including a TWTA at the operating frequency; c) user terminal to demodulated the multi-carrier DVB-S2 signal including the proposed equalization techniques.
This prototype is therefore intended to demonstrate in a realistic testing environment the potential benefits in terms of system efficiency of grouping more communication signals through a single HPA enhancing the payload flexibility.
The work will be organised in only one phase. The activity would be focused on the development of a breadboard for both the gateway transmit part and the terminal receive part. The prototype will include the integration of an existing DVB-S2 modem with the hardware (e.g. DSP/GPU-based) devoted to the implementation of the advanced compensation techniques for multicarrier transmission.
(*) Priority 2 activities will only be initiated on the explicit request of at least one delegation.