document title / titre du document TRP W ORK PLAN ... - emits - ESA

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TRP Work Plan 2005-2007 Description of Activities TEC-SB/7935/dc 12/Feb/09 TRP Reference: T501-12ET Study of Enhanced digital transmission techniques for Broadband Satellite Digital Title: Transmissions Advanced digital techniques can be envisaged making use of dynamic signal pre-distortion at the modulator side combined with adaptive non-linear equalizer at the receiver in order to compensate both the amplitude and the ISI (Inter-Symbol Interference) distortions caused by the channel non-linearity. If digital pre-compensation and equalization techniques are used, the optimum operating point in terms of Baud rate may be shifted towards greater value of Bs/Bf while output back-off reduced. This is particularly true if higher order modulations (such as 8PSK, 16/32-APSK) currently proposed by DVB-S2 are adopted. Efficiency gains in the order of 2 dB in terms of power efficiency and 20-30% in spectral efficiency are expected with affordable implementation complexity. A further step is represented modulation schemes with constant envelope like M-ary CPM (Continuous Phase Modulation) signals and re-assessment of their suitability to broadband satellite communications. In particular, their energy and spectral efficiency on linear channel shall be investigated and compared to more classical linear band-limited M-QAM modulations. Performance shall also be investigated for typical non-linear satellite channels to show the performance gain of these signals. New coding schemes employing CPM signals shall also be studied. Carrier and timing synchronization techniques that are able to work at the very low operative SNR of typical satellite transmissions in presence of powerful coding schemes, shall be studied and optimised. Overall coded modulation performance over typical satellite nonlinear channels shall be finally estimated through an accurate end-to-end simulator. Finally implementation complexity issues for the demodulator and decoder shall be analysed and CPM complexity shall be compared with current state-of the art M-QAM demodulator/decoders. This is a key issue as in the past adoption of CPM schemes was often discarded for high-speed applications because of the lack of maturity of digital signal processing technologies. The activity shall include: 1. technical report trading off different equalization techniques for the specific application showing the proposed innovative techniques as well as their performance results assessed through analysis and computer simulations; 2. the description and the performance of the selected coded modulation scheme over the linear and non-linear channel; 3. the gain w.r.t the more classical modulations shall also be assessed; 4. the description and the performance of the carrier and symbol timing synchronizers suitable for the selected modulation scheme for both the forward and the return channel; 4. an in-depth assessment of the equalizer complexity and feasibility study for the selected application scenarios; 5. a software package in MATLAB or C/C++ implementing the overall system simulation including the channel distortion elements (IMUX/OMUX and power amplifiers) and modulators and demodulators with the proposed innovative techniques. Deliverables: Technical report. Selected modulation scheme description/performance/feasibility study; SW (MATLAB or C/C++). Current TRL: TRL1 Target TRL: TRL2-3 Application Need/Date: TRL5 by 2008-2009 Application/Mission: Telecom Contract Duration: 18 months SW Clause : - Dossier0 Ref.: T-7923 Consistency with Harmonisation Roadmap and Conclusions: Page 107 of 227
TRP Work Plan 2005-2007 Description of Activities TEC-SB/7935/dc 12/Feb/09 TRP Reference: Title: T501-14ET Broadband low-power ADC design & prototyping The present activty is in line with the DSM (Deep Submicron Microelectronics) initiative strategy paper (ESA/IPC(2006)88). The main object of this study is the development of a 10 bits broadband (500 MHz / ~1.500 Msps) Analog-to-Digital Converter (ADC) with low power consumption (~1W) for on-board digital processing applications. This activity shall encompass the following tasks: - Process selection: 1. Radiation effects and mitigation techniques, 2. Reliability, 3. Lifetime. - Architecture trade offs. - Design. - Layout. - Simulations post layout. - Prototype/s manufacturing. - Electrical testing and performances measurement. - Limited environmental tests (temperature / radiations). This activity will be continued in the NewPro program (doc. ref. ESA/IPC(2006)75, activity ref. NP10-01ED). Deliverables: Electrically characterised prototypes and preliminary environmental tests results. The prototype shall be as representative as possible of a flight model, including the manufacturing of the die but also the package (ceramic hermetic package). Furthermore, the manufacturer shall propose a business model definition for the qualified product. Current TRL: TRL3 Target TRL: TRL4 Application Need/Date: TRL5/6 >2011 TLC: on-board processing, SCI: science & remote sensing instruments, EO: Application/Mission: instruments, TLM&control, high-speed Contract Duration: 15 months rate data downlink. SW Clause : - Dossier0 Ref.: T-7891, T-7742 Consistency with Harmonisation Roadmap and Conclusions: ESA/IPC(2006)88 TRP Reference: T501-15ET Title: Broadband low-power DAC design & prototyping The present activty is in line with the DSM (Deep Submicron Microelectronics) initiative strategy paper (ESA/IPC(2006)88). The main object of this study is the development of a 12 bits broadband (500 MHz / ~1.500 Msps) Digital-to-Analog Converter (DAC) with low power consumption (~.6W) for on-board digital processing applications. This activity shall encompass the following tasks: - Process selection: 1. Radiation effects and mitigation techniques, 2. Reliability, 3. Lifetime. - Architecture trade offs. - Design. - Layout. - Simulations post layout. - Prototype/s manufacturing. - Electrical testing and performances measurement. - Limited environmental tests (temperature / radiations).. This activity will be continued in the NewPro program (doc. ref. ESA/IPC(2006)75, activity ref. NP10-02ED). Deliverables: Electrically characterised prototypes and preliminary environmental tests results. The prototype shall be as representative as possible of a flight model, including the manufacturing of the die but also the package (ceramic hermetic package). Furthermore, the manufacturer shall propose a business model definition for the qualified product. Current TRL: TRL3 Target TRL: TRL4 Application Need/Date: TRL5/6 after2011 TLC: on-board processing, SCI: science & remote sensing instruments, EO: Application/Mission: instruments, TLM&control, high-speed Contract Duration: 15 months rate data downlink. SW Clause : - Dossier0 Ref.: T-7891, T-7742 Consistency with Harmonisation Roadmap and Conclusions: ESA/IPC(2006)88 Page 108 of 227
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