Relaying in optical wireless communication

Relaying in optical wireless communication

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Co-located MIMO systems might not be realisable for all applications and this encourages the implementation of distributed MIMO systems with widely separated nodes cooperating to provide spatial diversity. Such systems, which are also known as cooperative or relay-assisted communication, have been extensively investigated in the context of RF wireless communication. Multi-hop transmission is an alternative relay-assisted scheme, which employs multiple relays in serial configuration. RF multi-hop systems do not offer any diversity gain but they are typically employed to extend the coverage of communication networks. This chapter will investigate the application of distributed MIMO and relaying strategies as efficient solutions to overcome atmospheric degradations in OWC channels.

Chapter Contents:

  • 14.1 Introduction
  • 14.2 The optical wireless channel
  • 14.2.1 Fading statistics
  • 14.2.2 Optical detection and receiver noise
  • 14.3 Relaying configurations
  • 14.3.1 Relaying signaling schemes
  • 14.4 Performance of relay-assisted OWC systems
  • 14.4.1 Performance of DF relaying systems
  • 14.4.2 Performance of AF relaying systems
  • 14.4.3 Diversity gain analysis
  • 14.5 Relay-assisted quantum communication
  • 14.5.1 Relay-assisted QKD
  • 14.5.2 Qubit error rate performance analysis
  • 14.6 Mixed RF-FSO relay transmission
  • 14.6.1 Subcarrier intensity modulation
  • 14.7 Optical orthogonal frequency multiplexing and effects of signal clipping
  • 14.7.1 Signal shaping
  • 14.7.2 PAPR reduction
  • 14.7.3 Combined effects of non- linearities and turbulence in FSO communication
  • References

Inspec keywords: free-space optical communication; telecommunication channels; MIMO communication; diversity reception; relay networks (telecommunication)

Other keywords: multihop transmission; serial configuration; RF multihop systems; relay-assisted communication; relay-assisted scheme; relaying strategies; OWC channels; optical wireless communication; diversity gain; distributed MIMO systems; cooperative communication; atmospheric degradations; spatial diversity; RF wireless communication; co-located MIMO systems

Subjects: Free-space optical links

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