Summary The upcoming migration of satellite services to higher bands, namely, the Ka‐ and Q/V‐bands, offers many advantages in terms of bandwidth and system capacity. However, it poses challenges as propagation effects introduced by the various atmospheric phenomena are particularly pronounced in these bands and can become a serious constraint in terms of system reliability and performance. This paper presents the goals, organisation, and preliminary results of an ongoing large‐scale European coordinated propagation campaign using the Alphasat Aldo Paraboni Ka/Q band signal payload on satellite, performed by a wide scientific consortium in the framework of a European Space Agency (ESA) project. The main objective of this activity is the experimental characterisation of the spatial and temporal correlation over Europe of the radio channel at Ka and Q band for future modelling activities and to collect data for development and testing of fading mitigation techniques.
The characterization of the fade dynamics on Earth-satellite links is an important subject when designing the so called fade mitigation techniques that contribute to the proper reliability of the satellite communication systems and the customers' quality of service (QoS). The interfade duration, defined as the period between two consecutive fade events, has been only poorly analyzed using limited data sets, but its complete characterization would enable the design and optimization of the satellite communication systems by estimating the system requirements to recover in time before the next propagation impairment. Depending on this analysis, several actions can be taken ensuring the service maintenance. In this paper we present for the first time a detailed and comprehensive analysis of the interfade events statistical properties based on 9 years of in-excess attenuation measurements at Ka band (19.7 GHz) with very high availability that is required to build a reliable data set mainly for the longer interfade duration events. The number of years necessary to reach the statistical stability of interfade duration is also evaluated for the first time, providing a reference when accessing the relevance of the results published in the past. The study is carried out in Aveiro, Portugal, which is conditioned by temperate Mediterranean climate with Oceanic influences.
Ventouras, S. ; Reeves, R. ; Rumi, E. ; Perez-Fontan, F. ; Machado, F. ; Pastoriza, V. ; Rocha, A. ; Mota, S. ; Jorge, F. ; Panagopoulos, A.D. ; Papafragkakis, A.Z. ; Kourogiorgas, C.I. ; Fiser, O. ; Pek, V. ; Pesice, P. ; Grabner, B. ; Vilhar, A. ; Kelmendi, A. ; Hrovat, A. ; VanhoenackerJanvier, Danielle ; Graziani, Alberto ; Quibus, Laurent ; Goussetis, G. ; Martellucci, A. AbstractThe upcoming migration of satellite services to higher bands, namely the Kaand Q-bands offers many advantages in terms of bandwidth, data rates and system capacity. However, it poses challenges as propagation effects introduced by the various atmospheric phenomena are particularly pronounced in these bands and can become a serious constraint in terms of system reliability and performance. This paper outlines the goals, organization and some first results of an ongoing large propagation campaign consortium formed across Europe under the supervision of the European Space Agency; the campaign, shall ultimately assist in the validation and development of channel models targeting thesebands. Finally, the consideration of diverse climatic conditions and elevation angles along with the evaluation of the frequency and spatio-temporal effects, shall support the development of Fading and Mitigation Techniques and their assessment using real data. Abstract-The upcoming migration of satellite services to higher bands, namely the Ka-and Q-bands offers many advantages in terms of bandwidth, data rates and system capacity. However, it poses challenges as propagation effects introduced by the various atmospheric phenomena are particularly pronounced in these bands and can become a serious constraint in terms of system reliability and performance. This paper outlines the goals, organization and some first results of an ongoing large propagation campaign consortium formed across Europe under the supervision of the European Space Agency; the campaign, shall ultimately assist in the validation and development of channel models targeting these-bands. Finally, the consideration of diverse climatic conditions and elevation angles along with the evaluation of the frequency and spatio-temporal effects, shall support the development of Fading and Mitigation Techniques and their assessment using real data.
The fade dynamics is a major subject when designing the so-called Fade Mitigation Techniques (FMTs), which allow to compensate for the in excess channel attenuation, ensuring the proper link availability and costumers' quality-of-service (QoS). The interfade duration is generally defined as the time lapse between two consecutive fade-events; it enables an operator to evaluate the system capacity to recover before the following fade-event and assists the design of FMTs. However, not only it has been poorly studied in the past, as it would also be interesting to establish a relationship between interfade duration and its underlying physical phenomena and, at the same time, extract each component from the entire time lapse between consecutive fade-events, once each one should be associated different physical phenomena. In this work a time-based classification is applied in order to separate each interfade duration component and differentiate interfade duration from inter-event duration. A first approach on modelling each component is also presented and evaluated
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