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T. Rossi,
E. Cianca,
M. Lucente,
M. De Sanctis,
C. Stallo,
M. Ruggieri,
A. Paraboni, A. Vernucci,
L. Zuliani,
L. Bruca,
G. Codispoti
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ABSTRACT: Broadband technologies are taking a predominant role in the emerging information society. In particular, broadband satellite communication systems, with their global access and broadcasting capabilities, are well suited to answer to the requirements of the information society. This paper focuses on the efforts that are currently spent toward the development of EHF (Extremely High Frequency) satellite communications systems. In particular, Q/V (35-75 GHz) and W (75-110 GHz) bands, represent an almost ldquofreerdquo spectrum resource that could be used to realize the so-called satellite gigabit-connectivity, in order to support innovative broadband applications. This paper presents the most important features of an experimental Q/V band satellite network based on the Alphasat TDP#5 (technology demonstration payload), an ongoing project, funded by the Italian space agency, that aims at carrying out communication and propagation experiments over a Q/V band satellite link.
Aerospace conference, 2009 IEEE; 04/2009
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ABSTRACT: Q/V band frequencies are expected to play a key role in enabling challenging and unproven broadband communications missions for a wide range of applications. In the perspective to exploit these frequencies, several satellite missions have been proposed to explore the physics of the satellite channel. The strategic importance of probing higher and higher frequencies has been recognized by the Italian Space Agency through the ITALSAT mission that up to date has been the major contributor to the advancement of the Q/V band propagation knowledge. In 2004 ASI funded a feasibility study (phase A study), called TRANSPONDERS, Italian acronym for "research, analysis and study of Q/V payloads for telecommunications", whose main objectives were the improvement of the knowledge of propagation impairments at Q/V band and the evaluation of the effectiveness of PIMTs (Propagation Impairment Mitigation Techniques) in very high frequency band operation. In this paper, after an overview of the potential applications in Q/V band and the top level mission architecture relative to the selected applicative mission at these frequencies, the applicability of three selected PIMTs, such as site diversity, power control and Adaptive Coding and Modulation (ACM), in a Q/V band scenario is discussed and main challenges and key issues are identified.
GLOBECOM Workshops, 2008 IEEE; 01/2009
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ABSTRACT: The paper summarizes the baselines of a new satellite payload for radiowave propagation measurements in the Ka and Q/V bands which is being developed by the European Space Agency for the ESA Alphasat mission with the full support of the Italian Space Agency (ASI). The radiowave propagation experiment will be based on a geostationary satellite and will allow collecting a set of multiple simultaneous attenuation and depolarization measurements during a period of at least 3 years (with a possible extension up to 5 years) in many locations spread across a large area. This experiment represents a natural continuation of the European commitment on the characterisation of the Ka and Q/V band demonstrated during the recent period by the development of ESA OLYMPUS, ASI ITALSAT and CNES STENTOR satellites. The baseline design foresees a transmit-only payload radiating stable Ka and Q band coherent beacon signals from a geostationary platform. It is foreseen that the coverage area will be at least continental Europe with the possibility of a global coverage being considered; the polarization will be circular in order to ease depolarization measurements where possible and the reception shall be possible with antennas with diameter of the order of one meter.
Antennas and Propagation, 2007. EuCAP 2007. The Second European Conference on; 12/2007
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ABSTRACT: A comparative analysis between frequency scanning and multispot satellite systems has been performed in the context of land mobile applications. The aim of the work has been to confirm the effectiveness of the frequency scanning approach, whose technical feasibility has already been proved by the authors in a previous study, also in a comparative investigation with a more conventional satellite configuration.A proper comparative methodology has been established to compare two baseline configurations of the two systems. The analysis has also been rendered parametric, varying some system characteristics such as bandwidth, traffic distributions and linearity requirement. The achieved results are provided and widely commented on in the paper.
International Journal of Satellite Communications 03/2007; 13(2):85 - 104.
