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Next-generation non-geostationary satellite communication systems: link characterization and system perspective

Next-generation non-geostationary satellite communication systems: link characterization and system perspective

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In this book chapter, the next-generation NGSO satellite communication systems and the propagation link characteristics induced are presented and discussed. NGSO satellite systems are not a very recent idea, since NGSO systems have been operating since the end of the 1990s of the previous century. In Table 6.3, the advantages and disadvantages of NGSO systems in comparison to GSO networks are briefly given. The advantages of NGSO systems are the lower latency, smaller size and lower losses in comparison to GEO satellite systems and that when a constellation is shaped a global coverage can be achieved. Now, new systems have been put in operation and are planned which are using NGSO satellites. The next-generation systems will make use of the high-frequency bands and higher data rates could be delivered. Depending on the application, service provided and kind of link (feeder or user links), different frequency bands will be used. Different bands experience different propagation characteristics. Lower bands (L-/S-bands) are mostly affected by the local environment while in high-RF bands and optical range, atmospheric effects must be considered for the system design. Moreover, the use of fade mitigation techniques, such as ACM or diversity techniques, increase system's throughput and availability as has been shown in recent studies. However, an issue which must be tackled is the inter-system interference not only for the NGSO and GEO systems but also for the different mega-constellations, if all these planning systems will be set during launch and operation.

Chapter Contents:

  • 6.1 Next-generation NGSO satellite systems
  • 6.2 Propagation characteristics and models
  • 6.2.1 Local environment effects
  • 6.2.2 Propagation characteristics through atmosphere
  • 6.2.2.1 Propagation characteristics for RF systems at Ka-band and above
  • 6.2.2.2 Propagation characteristics for optical NGSO systems
  • 6.3 NGSO satellite communication systems capacity enhancement through transmission techniques
  • 6.3.1 Variable and adaptive coding and modulation
  • 6.3.2 Diversity techniques
  • 6.3.3 Interference issues and NGSO–GSO cooperation
  • 6.4 Conclusions
  • References

Inspec keywords: next generation networks; radiofrequency interference; radiowave propagation; satellite communication; telecommunication network planning; diversity reception

Other keywords: GEO system; next-generation NGSO satellite communication systems; intersystem interference; diversity technique; high-frequency bands; planning systems; next-generation nongeostationary satellite communication systems; fade mitigation techniques; data rates; system perspective; link characterization; ACM technique; frequency bands; propagation link characteristics

Subjects: Electromagnetic compatibility and interference; Radiowave propagation; Satellite communication systems; Communication network design, planning and routing

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