| KEYWORD |
Progetto di codici di canale per le missioni satellitari di osservazione terrestre
Parole chiave CHANNEL CODES, SATELLITE COMMUNICATIONS
Riferimenti GUIDO MONTORSI
Gruppi di ricerca Advanced techniques for digital transmission (CommGroup)
Tipo tesi TECNICA TEORICO-PRATICA
Descrizione Despite this wide range of ModCods up to 64APSK 9/10, a recent study performed by the satellite
network of experts (SatNEx III) demonstrated that, depending on the G/S location, the available
set of CCSDS ModCods already saturates above a certain elevation angle, beyond which a growing gap
with respect to achievable capacity is witnessed. The more favourable the geometrical visibility
and the propagation impairments are for the G/S location (e.g. polar regions), the lower this
elevation is leading to spectral efficiency saturation. This key result indicates that, to fully
exploit the K-band advantages, there is a need for future direct LEO-to-ground EESS systems to
further increase their offered spectral efficiency and that a study should be undertaken to address
this issue. Such a study has to provide a roadmap for the long-term evolution of future direct
LEO-to-ground EESS systems, addressing their overall architecture with a view of maximizing the
feasible spectral efficiency and reaching the full data rate capabilities, while at the same time
optimizing the power consumption and operational flexibility. Given the long development time (from
TRP studies to flight models), it is necessary to initiate this activity to be able to serve
missions after 2025.
The activity will focus on the design of the next generation waveform for the high data rate
telemetry (TM) downlink in the future direct LEO-to-ground EESS missions operating in the 26 GHz
band. This new waveform shall be the result of:
a) new coding/modulation schemes as well as other signal processing enhancements to maximize spectral efficiency for non-linear channels;
b) trade-offs (including mass and power consumption) in the use of single polarization, investigating
also the potential of carrying out signal processing in double polarization.
Conoscenze richieste The ideal candidate is a master degree graduate in telecommunications with good knowledge of C++
programming and the physical layer of digital communication systems.
Note The student will work within a project funded by the European Space Agency
Scadenza validita proposta 30/06/2016
PROPONI LA TUA CANDIDATURA