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The use of higher frequencies for satellite multimedia communication systems calls for research of the atmospheric propagation effects at these bands (rain, cloud and gaseous attenuation, scintillation, and depolarization). Alphasat was successfully launched on 25 July 2013. This largest and most powerful European telecommunication satellite carries, besides a commercial payload belonging to the mobile...
In interactive satellite communication systems, adaptive coding and modulation is a suitable countermeasure to mitigate the high fade dynamics of frequency ranges like the Ka-band. Consequently, receivers that support operation at low and very low SNR are required. In this paper, we present such a receiver structure dedicated for burst reception in a MF-TDMA system, as it is typically adopted in the...
In satellite communications, the demand for capacity increase is met by the use of higher frequency bands, which however are severely impaired by atmospheric phenomena (rain, cloud and gaseous attenuation, scintillation). In order to study propagation effects for future satellite communication frequencies both in temperate and tropical climates, JOANNEUM RESEARCH carries out two long-term propagation...
This paper presents an overview of the activities performed by the Agency in the framework of the Alphasat Aldo Paraboni scientific experiment at Ka and Q band. In particular it addresses the technological developments for the equipment of the propagation campaign, the execution of mission related activities, the execution of propagation campaigns, the international cooperation with the group of propagation...
In order to study propagation effects for future satellite communication frequencies, the Alphasat Aldo Paraboni payload includes two beacon transmitters at Ka-band (19.701 GHz) and Q-band (39.402 GHz). Among all atmospheric effects, rain has the biggest impact on signal transmission. Often a single statistical relationship (derived from climatic parameters) between rain rate and specific attenuation...
This paper presents an overview of the activities performed by the Agency in the framework of the Alphasat Aldo Paraboni scientific experiment at Ka and Q band. In particular it addresses the technological developments for the equipment of the propagation campaign, the execution of mission related activities, the execution of propagation campaigns, the international cooperation with the group of propagation...
In order to study propagation effects for future satellite communication frequencies, the Alphasat Aldo Paraboni (TDP 5) payload includes two beacon transmitters at Ka-band (19.701 GHz) and Q-band (39.402 GHz). Under ESA contract a Ground Propagation Terminal was developed to measure the co-and cross polar signals of both frequencies with the same antenna. The measurement site hosts ancillary equipment...
The Aldo Paraboni Payload on the Alphasat satellite consists of two Q/V-band transponders and two beacons at Ka- and Q-band. During the first period of experimentation the satellite transponders were set up in loopback mode. By comparison of the Q-band beacon with the Q/V-band transponder loop, the instantaneous frequency scaling between Q and V-band can be determined. In the present paper, the setup...
During the design phase of the Q/V-band ground station in Graz/Austria for the Alphasat TDP5 adaptive coding and modulation (ACM) communication experiment, which is based on the DVB-S2 standard, a tool for accurate SNR measurements with high time resolution was needed. State of the art DVB-S2 demodulators with built-in SNR estimators did not satisfy the requirements because the algorithms were not...
The Alphasat Aldo Paraboni Payload incorporates two Q/V-band satellite transponders, which covers three spot beams over Europe placed towards Italy and towards Graz/Austria. JOANNEUM RESEARCH developed and installed the ground station in Graz and operates communication experiments since beginning of 2014. The goal is to optimize the usage of the Q/V-band channel especially with respect to its high...
The development and performance of a hardware-prototype multi-user detection (MUD) receiver for Inmarsat's Broadband Global Area Network (BGAN) is described. The MUD receiver is used to compensate increased adjacent channel interference due to reduced channel spacing and can simultaneously detect up to six bearers in a 200-kHz satellite subband. With this technique, the channel-spacing can be reduced...
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