Abstract
Research on SatCom nowadays aims at high data television broadcast and on-demand data transfer at a total rate ranging from several gigabit for mobile services up to one terabit for fixed terminals (Gayrard, Proceedings of the 1st international conference on advances in satellite and space communications SPACOMM, 2009; Thompson et al., Proceedings of the 3rd international conference on advances in satellite and space communications. IARIA XPS Press, Budapest, pp. 12–19, 2011; Vidal et al., Proceedings of the 1st AESS European conference on satellite telecommunications ESTEL, 2012; Duflos et al., Approaching the Terabit/s Satellite: A System Study. Executive Summary 1, Revision 1, ESA Contract No:. 4000103563, 2012). To pursue this goal, researchers have strengthened investigations to increase the number of spotbeams for geostationary earth orbit GEO satellites, increase the frequency reuse, and use higher frequency bands. For example, the S-band (2–4 GHz) and Ka-band (20–30 GHz) technologies gained importance over the L-band (1–2 GHz) and the Ku-band (12–14 GHz) for mobile and fixed terminal applications, respectively, because it allows to realize smaller transmit and receive apertures (Panagopoulos et al., IEEE Commun Surv Tutorials 6:2, 2004). The Ku-band and other bands above 10 GHz have also been investigated for mobile SatCom services (Arapoglou et al., Int J Satell Commun Netw 30:1, 2012; Liolis et al., IEEE Trans Veh Technol 59:1109, 2010), e.g., for trains, cars, and boats, such that mobile and fixed terminals may be served simultaneously in these bands.
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Notes
- 1.
Interference becomes severe if the frequency reuse factor is one, i.e., the same bands are used in all cells, or the beamwidth is decreased below the usually assigned 3 dB area.
- 2.
For multiple frequency bands, the model results in parallel vector BCs for the distinct frequency bands. These parallel BCs can be combined to a Multiple-input multiple-output (MIMO) BC model if the satellite and the terminals allow for carrier cooperation [303]. Carrier cooperation requires sufficiently different channels in the different bands to gain in performance over separately treating the different bands [304].
- 3.
- 4.
A spotbeam may also be created by an adaptive phased-array architecture.
- 5.
- 6.
With up to 121 spotbeams and simultaneously served terminals in one frequency band, multi-spotbeam SatCom systems are larger than common terrestrial systems, e.g., Wi-Fi and LTE.
- 7.
The same holds for the computational complexity of the beamformer computation (cf. Sect. 4.7).
- 8.
Vice versa, if one was aware of e k, the probability would be the CDF of σ kζ rain,k at g k(t, e k).
- 9.
The conditioning is removed due to independence of ζ rain,k and e k.
- 10.
This holds if all α k are sufficiently large, e.g., \(\|\boldsymbol {C}_k^{-1/2}\bar {\boldsymbol {h}}_k\|{ }_2^{2}>d_k(\alpha _k)\) must be satisfied for (6.18).
- 11.
The optimal α 0 for K = 7 terminals and low rain fading shows the same behavior as for K = 3.
- 12.
The equal probability restriction is used for the outer optimization of α = α 01.
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Gründinger, A. (2020). Applications in Satellite Communication. In: Statistical Robust Beamforming for Broadcast Channels and Applications in Satellite Communication. Foundations in Signal Processing, Communications and Networking, vol 22. Springer, Cham. https://doi.org/10.1007/978-3-030-29578-3_6
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