Multi-beam free-space optical link using space-time coding

Jaime A. Anguita, Mark A. Neifeld, Bane V. Vasic

Producción científica: Capítulo del libro/informe/acta de congresoCapítulo


All rights reserved. In this chapter we will study a FSO MISO system. Section 2 describes the components of single beam and multi-beam FSO communication links. Because spatial correlation among the propagating beams in a MISO link plays a key role in the system performance, this correlation structure must quantified as a function of turbulence strength, beam separation, and propagation distance. We present estimations of the spatial correlation obtained through numerical simulations for a MISO in Section 3. Properly designed multi-beam FSO links can deliver significant improvement in scintillation reduction which manifests in lower bit-error rates. In Section 4 we describe two space-time coding schemes using On-Off Keying (OOK) modulation. The first scheme is based on a spatial repetition code and the second scheme is based on a size-four rate-one ST block code. The latter has been adapted from an orthogonal space-time code proposed for wireless radio-frequency (RF) communications. Adaptation of such codes is mandated by the non-negativity of signals in optical communications. In Section 5 we show that both coding schemes have excellent performance in moderate and stronger turbulence conditions. The simpler repetition scheme, however, shows better performance. This difference is explained at the end of Section 5.
Idioma originalInglés estadounidense
Título de la publicación alojadaPrinciples of Waveform Diversity and Design
Número de páginas15
ISBN (versión digital)9781613531501, 9781891121951
EstadoPublicada - 1 ene. 2011

Palabras clave

  • Amplitude shift keying
  • Beam separation
  • Bit-error rates
  • Correlation structure
  • Error statistics
  • FSO MISO system
  • Modulation coding
  • Multibeam free-space optical link
  • Multibeam FSO communication links
  • Numerical analysis
  • Numerical simulations
  • On-off keying modulation
  • OOK modulation
  • Optical communications
  • Optical links
  • Optical modulation
  • Orthogonal codes
  • Orthogonal space-time code
  • Propagation distance
  • RF communications
  • Size-four rate-one ST block code
  • Space-time block codes
  • Space-time coding schemes
  • Spatial correlation estimation
  • Spatial repetition code
  • Turbulence strength function
  • Wireless radiofrequency communications


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