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Point-source point-receiver reciprocity holds when source and receiver positions are swapped. This study extends this to finite receivers, analyzing how turbulence and aperture size affect signal correlation for optical wireless communication.

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Area of Science:

  • Optical wireless communication
  • Electromagnetics
  • Atmospheric physics

Background:

  • Point-source point-receiver (PSPR) reciprocity states that the received field is invariant to interchanging source and receiver positions.
  • This principle is fundamental in wave propagation but typically assumes idealized point components.
  • Real-world systems utilize finite-sized receivers, introducing spatial averaging effects.

Purpose of the Study:

  • To extend the PSPR concept to scenarios with finite receivers in optical wireless communication.
  • To derive an analytical expression for the correlation coefficient of received powers.
  • To investigate the influence of atmospheric turbulence and receiver characteristics on this correlation.

Main Methods:

  • Application of weak-fluctuation theory to model wave propagation through atmospheric turbulence.
  • Development of an analytical expression for the correlation coefficient between signals at two link ends.
  • Parametric analysis of turbulence profiles, receiver aperture size, and central obscuration effects.

Main Results:

  • An analytical expression for the correlation coefficient was derived for finite receivers.
  • Atmospheric turbulence profile significantly impacts the correlation coefficient.
  • Receiver aperture size and central obscuration also influence the spatial averaging of scintillation, affecting correlation.

Conclusions:

  • The study quantifies the impact of finite receiver apertures on PSPR in turbulent channels.
  • Achieving channel reciprocity involves a trade-off with antenna gain and aperture averaging benefits.
  • The overall advantage of employing channel reciprocity is contingent on specific deployment scenarios.