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Large-scale antenna systems

Large-scale antenna systems

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This chapter has overviewed the principles of LSAS systems, as one of the dominant candidates for 5G communication networks and beyond. It is the remarkable advantages of LSAS, promised by communications theory that form the main driver for the adoption of LSAS systems in future networks. The implementation of LSAS is however subject to severe challenges, which pose the question of whether the promised benefits can be materialised in practice, and to what extent. This has been the central stimulus for the pursuit of practical approaches for LSAS deployment. While academic and industrial research on LSAS has been gaining momentum globally, a number of research problems remain open to this day, as identified throughout this chapter, promising a fruitful research field in the years to come.

Chapter Contents:

  • 4.1 Promises and challenges of LSAS
  • 4.1.1 LSAS promises
  • 4.1.1.1 Favourable propagation and channel hardening
  • 4.1.1.2 Linear signal processing and ideal power scaling law
  • 4.1.2 LSAS challenges
  • 4.1.2.1 Acquisition of channel state information in LSAS
  • 4.1.2.2 LSAS in multi-cell systems: pilot contamination
  • 4.1.2.3 Hardware limitations in LSAS
  • 4.1.2.4 Antenna array topologies and limited physical space
  • 4.1.2.5 Signal processing complexity in LSAS
  • 4.2 LSAS channel models and propagation aspects
  • 4.2.1 Theoretical LSAS channel models
  • 4.2.1.1 Exponential correlation model
  • 4.2.1.2 One-ring channel model
  • 4.2.1.3 Physical or finite scatterer channel model
  • 4.2.2 Mutual coupling characterisation
  • 4.2.3 Measurement campaigns and LSAS-specific channel models
  • 4.3 LSAS: system design and optimisation
  • 4.3.1 Reduced RF-chain implementations
  • 4.3.1.1 Antenna selection
  • 4.3.1.2 Hybrid analogue and digital beamforming: reducing the number of RF chains
  • 4.3.1.3 Spatial modulation
  • 4.3.2 Energy efficiency optimisation
  • 4.3.3 Network architectures and distributed LSAS
  • 4.4 Concluding remarks
  • Acknowledgements
  • References

Inspec keywords: mobile antennas; 5G mobile communication

Other keywords: LSAS systems; large-scale antenna systems; 5G communication networks; communications theory

Subjects: Single antennas; Mobile radio systems

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