Accurate modelling of Ka-band videoconferencing systems based on the quality of experience

Abstract

This work formed part of the project TWISTER, which was financially supported under the European Union 6th Framework Programme (FP6). The authors are solely responsible for the contents of the paper, which does not represent the opinion of the European Commission.Ka-band satellite multimedia communication networks play important roles because of their capability to provide the required bandwidth in remote places of the globe. However, because of design complexity, in practice they suffer from poor design and performance degradation because of being practically forced to guarantee acceptable end-user satisfaction in conditions of extremely low bit error rates, which is emphasised with the vulnerability of compressed video content to transmission errors, often impossible to be applied during the service development phase. A novel discrete event simulation model is presented, which provides performance estimation for such systems based on subjective measurement and a better quality of experience. The authors show that the proposed model reduces implementation cost and is flexible to be used for different network topologies around the globe.peer-reviewe

Modeling Electromagnetic signal levels falling on aircraft from satellite communication systems

“…A number of complex meteorological mechanisms contribute to the overall EM attenuation experienced by the transmitted signal. Nevertheless, for frequencies below 100 GHz, the most influencing phenomena are considered to be rain precipitation, atmospheric gaseous absorption, clouds, fog and tropospherical scintillation [26].…”

QoS provisioning by power control for video communication via satellite links

“…This high rain attenuation cannot be overcome simply by system margins. Rain-induced fades can cause significant propagation loss to satellite communication systems operating at frequencies above 10 GHz, with attenuations of over 20 dB at 100 mm/h rainfall rate [9]. The effects of rain on radio-wave propagation become more severe as the frequency increases.…”

Reliability and security investigations on video streaming over satellite links

“…Especially, rain attenuation is more severe in the tropical region where heavy convective rain dominates [3]. The rain attenuations can reach over 20 dB at approximately 100 mm/hr rainfall rate [4].This high rain attenuation cannot be overcome simply by system margins. The effects of rain on radio-wave propagation become more severe as the frequency increases.…”

“…Since rain attenuation is more severe in the tropical regions where heavy convective rain dominates [24]. The rain attenuations can be over 20 dB at approximately 100 mm/hr rainfall rate [25]. The existing ITU-R model might not be sufficiently accurate to be implemented.…”