#Moneyhouse xavier boulanger series
Nevertheless, as only few data have been collected so far in tropical and equatorial areas at Ku-band (almost no data are available at higher frequencies), an alternative to using real data collected from propagation experiments is generally to generate time series representative of propagation impairments making use of climatological characteristics as well as geometric and radiowave parameters of the link under investigation. To test and adjust FMT control loops, propagation time series are needed. more ABSTRACT The development of Fade Mitigation Techniques real-time algorithms requires a good knowledge of propagation impairment dynamics. Finally, fade duration and fade slope statistics derived at three locations are presented and discussed.ĪBSTRACT The development of Fade Mitigation Techniques real-time algorithms requires a good knowl. Seasonal attenuation statistics for Ottawa and Aveiro are compared. After a brief introduction of the experiments, rain rate and excess attenuation results are discussed, first for a common measurement period and later for the whole database available. The beacon signal data was monitored and collected on a continuous basis over the whole measurement period. Multi-year measurements allow the production of more stable statistics reflecting the long-term behavior of propagation phenomena and to investigate its year-to-year variability. Attenuation statistics are derived from satellite beacon data collected over 6 years at Aveiro, 5 years at Ottawa and Madrid and 2 years at Toulouse. The experiments are carried out in Ottawa, Canada Aveiro, Portugal Madrid, Spain and Toulouse, France. In this collaborative paper, the main results of four long-term Ka-band propagation campaigns are presented. more ABSTRACT Propagation effects such as rain or clouds attenuation cause deeper fades in the Ka-band than at lower frequencies. Secondly, some limitations are highlighted before moving on an overview of a more simplified new channel model to syn.ĪBSTRACT Propagation effects such as rain or clouds attenuation cause deeper fades in the Ka-band.
The aim of this paper is first of all to present the justification of the parameterization used in Recommendation ITU-R P.1853-1 which has not been published in the open literature. Unfortunately, the low number of available propagation experiments at Ka-band and above unavoidably leads to the use of channel models allowing synthetic total attenuation time series to be generated. To develop, test and adjust the real-time algorithms of these adaptative FMTs, a good knowledge of the dynamics of the propagation channel is required and realistic attenuation time series are needed to feed system simulators. more To insure a favourable link budget in order to reach the required availabilities and to counteract severe propagation impairments, Fade Mitigation Techniques FMT, such as adaptive coding have to be implemented in the fixed satellites telecommunications systems. To insure a favourable link budget in order to reach the required availabilities and to counterac.
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