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).
Description:
Background:
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.
Description:
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.
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