The concept of geostationary VHTS (Very High Throughput Satellites) is based on multibeam coverage with intensive frequency and polarization reuse, in addition to the use of larger bandwidths in the feeder links, in order to provide high capacity satellite links at a reduced cost per Gbps in orbit. The dimensioning and design of satellite networks based on VHTS imposes the analysis of multiple trade-offs to achieve an optimal solution in terms of cost, capacity, and the figure of merit of the user terminal. In this paper, we propose a new method for sizing VHTS satellite networks based on an analytical expression of the forward link CINR (Carrier-to-Interference-plus-Noise Ratio) that is used to evaluate the trade-off of different combinations of system parameters. The proposed method considers both technical and commercial requirements as inputs, including the constraints to achieve the optimum solution in terms of the user G/T, the number of beams, and the system cost. The cost model includes both satellite and ground segments. Exemplary results are presented with feeder links using Q/V bands, DVB-S2X and transmission methods based on CCM and VCM (Constant and Variable Coding and Modulation, respectively) in two scenarios with different service areas.

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1 Abstract-This work generates a simulation model to understand the effects of attenuation in broadcasting satellite links like for data links and especially to determine the feasibility of using a high performance satellite backhaul for new generation data networks, faced with different scenarios especially in areas where rainfall attenuates and degrades the RF satellite links. Predictive models have been assembled delivered by the ITU and its recommendations for rain attenuation and the links are integrated with DVB-S2 and NS3 standards, where the simulated model will be obtained which with a position geographical coordinates as a reference of the remote station VSAT, will result in operating modes, signal strength and availability of the satellite link given. This certainly makes it a tool to study and design that many papers omitted on the research part and it becomes necessary to be applied in new models of propagation and attenuation in regions where it is desired to conduct the study, achieving thus a greater precision in the quality of links and a more encouraging panorama to deploy networking data systems high reliability and high transmission rates based on next generation 4G and future 5G networks.