High Throughput Satellites: An Analytical Approach

Abstract

KA-SAT has represented a new generation of High Throughput Satellites (HTS) with the largest number of spots delivering a capacity of 90 Gb/s for a wide variety of services ranging from internet access in homes, to satellite news gathering and domestic broadcasting. HTS systems require a critical approach in terms of communication system requirements and payload analysis. This paper presents the typical system architecture of such systems and provides an analytical approach to elements that are required for the estimation of Forward and Return capacity, the key factor in these systems. These elements include the EIRP and G/T cumulative densities, the C/I estimations and the capacity assessment for the Forward and Return Links.

High throughput satellite systems: An analytical approach

“…It should be noted that EIRP pk = P TWT − L o/p − L ant + D pk (2) where P TWT is the useful traveling wave tube (TWT) RF power in dBW, L o/p is the repeater output losses in dB, L ant is the antenna losses in dB, D pk is the peak directivity in dBi. The cumulative distribution function (CDF) [12] over a hexagonal cell is shown in Fig. 8 where 90.7% of the area is circular and therefore linear.…”

“…The G/T analysis can be expressed as (12) where G T θ is the G/T in dB/K at off-set angle of θ, G T pk is the peak G/T in dB/K at the boresight of the beam and cell (the beam and cell are assumed to be concentric), θ eoc is the full eoc beamwidth in degrees, and β is as defined earlier and equal to 4. G T pk − G T eoc in dB.…”

“…Thus KA-SAT, ViaSat 1, and Echostar 17 (aka Jupiter) can be considered to be in the second generation. Next generation HTS's will push for an increase in the system capacity and an optimisation of the satellite and system resources in order to make available higher capacities to the consumer while providing a quality comparable to fiber-to-the-home [9,11,12].…”

Eutelsat HTS systems

“…In the last decade, high throughput satellite (HTS) systems have enjoyed a large development and deployment all over the world, thanks also to a significant effort at intellectual and engineering level . Different definitions for HTS systems can be used.…”

Cross‐polarisation discrimination‐induced interference in dual‐polarised high‐capacity satellite communication systems

“…CCI has been identified as one of the factors which has significant system performance‐limiting potential. It is a major issue to be addressed in HTS system design [6–10]. Systems that reuse frequency by adopting DOP transmission are prone to system‐ and medium‐induced depolarisation, which introduces interference power into the corresponding orthogonal channel, with consequent effects on system performance [11].…”